Limited Partners' Capital Account by Class [Axis] Limited Partners' Capital Account by Class [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Property and equipment Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment Other current assets Other Current Assets [Member] EnCap Flatrock Midstream EnCap Flatrock Midstream [Member] EnCap Flatrock Midstream Commodity derivatives Commodity Contract [Member] Crude oil Crude Oil [Member] Award Timing Predetermined Award Timing Predetermined [Flag] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Asset Class [Axis] Asset Class [Axis] Entity File Number Entity File Number Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Other long-term assets, net Other Noncurrent Assets [Member] Interest Rate Swap Interest Rate Swap [Member] Equity earnings in unconsolidated entities Equity earnings in unconsolidated entities Income (Loss) from Equity Method Investments Tabular List, Table Tabular List [Table Text Block] Basic Net Income per Class A Share Earnings Per Share, Basic [Abstract] Crude oil purchases Contracts related to Crude Oil purchases [Member] Represents the derivative instruments utilized to hedge risk associated with crude oil purchases. Schedule of Related Party Transactions Schedule of Related Party Transactions [Table Text Block] Trade accounts receivable arising from revenues from contracts with customers Contract with Customer, Asset, after Allowance for Credit Loss, Current Schedule of Disposal Groups, Including Discontinued Operations Disposal Groups, Including Discontinued Operations [Table Text Block] Inventory by category Energy Related Inventory [Abstract] Position [Axis] Position [Axis] Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Basic net income per Class A share (usd per share) Earnings Per Share, Basic Adjustment to Compensation: Adjustment to Compensation [Axis] Related Party Transactions Related Party Transactions Disclosure [Text Block] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Commercial Paper Commercial Paper [Member] Net income attributable to noncontrolling interests from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Noncontrolling Interest Revenues and Accounts Receivable Revenue from Contract with Customer [Text Block] Partners' Capital and Distributions [Line Items] Partners' Capital and Distributions [Line Items] Partners' Capital and Distributions [Line Items] Measurement Input, Discount Rate Measurement Input, Discount Rate [Member] Other comprehensive income/(loss) Total period activity Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Schedule of Segment Financial Data Schedule of Segment Reporting Information, by Segment [Table Text Block] Discontinued operations (usd per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share PAA commercial paper notes Short-Term Debt Inventory by category Inventory Disclosure [Abstract] Net broker receivable Effect of Collateral Netting Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset Remaining performance obligation Revenue, Remaining Performance Obligation, Amount Current income tax expense from continuing operations Current Income Tax Expense (Benefit) Measurement Input Type [Domain] Measurement Input Type [Domain] Adjustment to Compensation, Amount Adjustment to Compensation Amount Affiliated Entity Affiliated Entity [Member] Unamortized discounts and debt issuance costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Investment and acquisition capital expenditures Investment and Acquisition Capital Expenditures Investment and Acquisition Capital Expenditures Schedule of Linefill and Long-Term Inventory Schedule of Inventory, Noncurrent [Table Text Block] Schedule of Net Broker Receivable/(Payable) Schedule of Due to (from) Broker-Dealer and Clearing Organization [Table Text Block] Employee Stock Option Share-Based Payment Arrangement, Option [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Proceeds from sales of assets Proceeds from Sale of Productive Assets Repurchase of Series A preferred units by a subsidiary (in shares) Partners' Capital Account, Shares, Cancellation Of Shares Partners' Capital Account, Shares, Cancellation Of Shares Long-term operating lease right-of-use assets, net Disposal Group, Including Discontinued Operation, Operating Lease Right of Use Assets, Noncurrent Disposal Group, Including Discontinued Operation, Operating Lease Right of Use Assets, Noncurrent Measurement Frequency [Axis] Measurement Frequency [Axis] Impact of derivative activities recognized in earnings Derivative Instruments, Gain (Loss) [Line Items] Insider Trading Policies and Procedures [Line Items] Hedging Designation [Domain] Hedging Designation [Domain] Maintenance capital expenditures Maintenance Capital Expenditures Capital expenditures for the replacement of partially or fully depreciated assets in order to maintain the operating and/or earnings capacity of the company's existing assets. CURRENT ASSETS Assets, Current [Abstract] Total liabilities and partners’ capital Liabilities and Equity Recurring Fair Value Measures Fair Value, Recurring [Member] Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Long-term liabilities: Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent [Abstract] Senior notes, net PAA senior notes Senior Notes, Noncurrent NGL Business NGL Business [Member] NGL Business LIABILITIES AND PARTNERS’ CAPITAL Liabilities and Equity [Abstract] Additions Contract with Customer, Liability, Additions Amount of additions to obligation to transfer good or service to customer for which consideration from customer has been received or is due. Linefill Disposal Group, Including Discontinued Operation, Linefill, Noncurrent Disposal Group, Including Discontinued Operation, Linefill, Noncurrent Cover page. Cover [Abstract] Discontinued Operations Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Maximum Maximum [Member] Derivative Assets Offsetting Derivative Assets [Abstract] Finite-lived intangible asset, useful life Finite-Lived Intangible Asset, Useful Life Permian JV Plains Oryx Permian Basin LLC [Member] Plains Oryx Permian Basin LLC LONG-TERM DEBT Long-Term Debt, Unclassified [Abstract] Net income attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Intangible assets, net Finite-Lived Intangible Assets, Net Impact due to contractual rights of offset with counterparties Contract With Customer, Contractual Rights Of Offset With Counterparties Amount of contractual rights of offset with counterparties that reduces the entity's right to consideration in exchange for good or service transferred to customer. Transportation Transportation [Member] Transportation Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Debt Instrument [Line Items] Red River Red River Pipeline Company LLC [Member] Red River Pipeline Company LLC [Member] INCOME FROM CONTINUING OPERATIONS, NET OF TAX INCOME FROM CONTINUING OPERATIONS, NET OF TAX Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Pay vs Performance Disclosure [Line Items] Trade accounts payable Disposal Group, Including Discontinued Operation, Accounts Payable, Current Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] 4.65% Senior notes due In october 2025 Senior Notes Due In October 2025 At 4.65 Percent [Member] Senior Notes Due In October 2025 At 4.65 Percent Accumulated depreciation Disposal Group, Including Discontinued Operation, Accumulated Depreciation Disposal Group, Including Discontinued Operation, Accumulated Depreciation Derivative position notional amount (in barrels or Bcf) Derivative, Nonmonetary Notional Amount, Volume Cash paid in connection with acquisitions, net of cash acquired Payments to Acquire Businesses and Interest in Affiliates INCOME FROM CONTINUING OPERATIONS BEFORE TAX Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Long-term liabilities of discontinued operations (Note 2) Total long-term liabilities of discontinued operations Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent Entity Shell Company Entity Shell Company Other long-term liabilities and deferred credits Other Liabilities, Noncurrent Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Common Units and Series A Preferred Units Common Units And Series A Preferred Units [Member] Common Units And Series A Preferred Units [Member] Operating Segments Operating Segments [Member] Short-term debt Disposal Group, Including Discontinued Operation, Debt, Current Disposal Group, Including Discontinued Operation, Debt, Current Unrealized gain on hedges Interest rate derivatives, net Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Class A Shares Shares Class A [Member] Represents the classification of shares representing limited partner interests in the company that are held by the public. Class A shareholders have equal voting rights with Class B shareholders and are entitled to receive distributions should distributions be paid by the company. Company Selected Measure Amount Company Selected Measure Amount Comprehensive income attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Award Timing MNPI Considered Award Timing MNPI Considered [Flag] SHORT-TERM DEBT Short-Term Debt [Abstract] Comprehensive income attributable to PAGP Comprehensive Income (Loss), Net of Tax, Attributable to Parent Measurement Input Type [Axis] Measurement Input Type [Axis] Disposal Group Name [Domain] Disposal Group Name [Domain] Name Measure Name Net income attributable to PAGP from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Repurchase of common units by a subsidiary Payments to Noncontrolling Interests Consolidated Joint Venture Entities Consolidated Joint Venture Entities [Member] Consolidated Joint Venture Entities Linefill, volumes (in barrels) Inventory, Volumes Linefill The volume of linefill inventory as of the balance sheet date. PAA Plains All American Pipeline L P [Member] Represents the information pertaining to Plains All American Pipeline, L.P. ("PAA"). Document Fiscal Period Focus Document Fiscal Period Focus Partner Capital Components [Domain] Partner Capital Components [Domain] Net income attributable to PAGP from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Current income tax expense Discontinued Operation, Current Income Tax Expense (Benefit) Discontinued Operation, Current Income Tax Expense (Benefit) Derivative assets and liabilities Derivatives, Fair Value [Line Items] Award Timing Method Award Timing Method [Text Block] Continuing operations (usd per share) Income (Loss) from Continuing Operations, Per Basic Share Award Type Award Type [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Current liabilities: Disposal Group, Including Discontinued Operation, Liabilities, Current [Abstract] Legal Entity [Axis] Legal Entity [Axis] Total assets Assets CASH FLOWS FROM INVESTING ACTIVITIES Cash Provided by (Used in) Investing Activity, Continuing Operation [Abstract] Investment, Name [Domain] Investment, Name [Domain] 2026 Finite-Lived Intangible Asset, Expected Amortization, Year One Trading Symbol Trading Symbol Contract with Customer, Asset And Liability [Table] Contract With Customer, Asset And Liability [Table] Contract With Customer, Asset And Liability [Table] Entity Address, City or Town Entity Address, City or Town Short-term Debt, Type [Domain] Short-Term Debt, Type [Domain] Distribution per unit (usd per share) Distributions per common unit, paid (usd per unit) Distribution Made to Limited Partner, Distributions Paid, Per Unit Total other segment items Total other segment items Segment Reporting, Other Segment Item, Amount Effect of translation adjustment - continuing operations Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Inventory, Linefill and Long-term Inventory Inventory Disclosure [Text Block] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Income Statement Location [Domain] Statement of Income Location, Balance [Domain] Distributions Total distributions paid Partners' Capital Account, Distributions Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] 2029 Finite-Lived Intangible Asset, Expected Amortization, Year Four Emerging Growth Company Entity Emerging Growth Company Entity Common Stock, Shares Outstanding (shares) Entity Common Stock, Shares Outstanding Estimated size of release (in barrels) Estimated Size of Release Represents the estimated size of the pipeline release. Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Basic Net Income per Class A Share: Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share [Abstract] Level 2 Fair Value, Inputs, Level 2 [Member] Net loss from commodity derivative activity Gain (loss) on derivatives recognized in net income Derivative, Gain (Loss) on Derivative, Net Investments in unconsolidated entities Equity Method Investments Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Business Combination [Domain] Business Combination [Domain] Other Other Debt [Member] Other types of debt not specifically identified. Dilutive shares resulting from assumed exchange of AAP Management Units (in shares) Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares PEO PEO [Member] Current liabilities Current Liabilities [Member] Primary financial statement captions encompassing current liabilities. Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Derivative activities and inventory valuation adjustments Gains (Losses) From Derivative Activities and Inventory Valuation Adjustments Gains (losses) related to derivative instruments for which the underlying transaction does not occur in the current period and on derivatives that are related to (i) investing activities, such as the purchase of linefill, and (ii) purchases of long-term inventory. Also includes the impact of corresponding inventory valuation adjustments, as applicable. Proceeds from the issuance of PAA senior notes (Note 6) Proceeds from Issuance of Senior Long-Term Debt Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Current assets: Disposal Group, Including Discontinued Operation, Assets, Current [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Cash and cash equivalents and restricted cash, beginning of period Cash and cash equivalents and restricted cash, end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Income Statement [Abstract] Income tax expense from continuing operations Income Tax Expense (Benefit) Net Carrying Value Presented on the Balance Sheet Derivative Asset Preferred unit distribution amount (usd per share) Preferred Stock, Dividends, Per Share, Cash Paid Discontinued operations (usd per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Arbitration Proceedings Against Insurers Arbitration Proceedings Against Insurers [Member] Arbitration Proceedings Against Insurers Number of days after end of quarter within which distributions must be paid to unitholders Number of Days Required for Distribution to Unitholders after End of Quarter The number of days after the end of the relevant quarter within which distributions of available cash must be paid to unitholders. Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Product and Service [Domain] Product and Service [Domain] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Hedging Relationship [Axis] Hedging Relationship [Axis] Average exchange rate (cad per usd) Derivative, Average Forward Exchange Rate Effect of Collateral Netting Offsetting [Abstract] Other Partners' Capital, Other Continuing operations (usd per share) Income (Loss) from Continuing Operations, Per Diluted Share Partners’ Capital Parent [Member] NET INCOME Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Business Combination [Table] Business Combination [Table] Held-for-Sale Discontinued Operations, Held-for-Sale [Member] Deferred income tax (expense)/benefit Discontinued Operation, Deferred Income Tax Expense (Benefit) Discontinued Operation, Deferred Income Tax Expense (Benefit) Notional amount of derivatives Derivative, Notional Amount Discontinued Operations and Disposal Groups [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Schedule of Assets Acquired and Liabilities Assumed Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Accumulated depreciation Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, Accumulated Depreciation and Amortization City Area Code City Area Code Acquisitions Mergers, Acquisitions and Dispositions Disclosures [Text Block] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Interest expense, capitalized interest Interest Costs Capitalized Cash Distribution Cash Distribution Cash Distribution [Member] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Cash used in investing activities - discontinued operations Cash Provided by (Used in) Investing Activity, Discontinued Operation Schedule of Contracts with Customers, Change in Asset and Liability Balance Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] General and administrative expenses Unallocated general and administrative expenses General and Administrative Expense Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Field operating costs Field Operating Costs [Member] Costs related to site and field operations during the period. Total repayments Repayments of Short-Term Debt Related Party Transactions [Abstract] Related Party Transactions [Abstract] Property, plant and equipment, useful life Property, Plant and Equipment, Useful Life Subsequent Event Subsequent Event [Member] Cash Flow Hedge Cash Flow Hedging [Member] Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Aggregate total estimated costs Loss Contingency, Estimate of Possible Loss PEO Total Compensation Amount PEO Total Compensation Amount Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Organization Consolidation and Presentation of Financial Statements [Table] Organization Consolidation and Presentation of Financial Statements [Table] Schedule detailing information related to organization, basis of accounting, or basis of presentation, used to prepare the financial reports of the entity. Cash paid for purchases of linefill Cash Paid Related to Purchases of Linefill The cash outflow associated with the purchase of linefill. Remainder of 2025 Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year Gross Position - Liabilities Derivative Liability, Subject to Master Netting Arrangement, before Offset Excluding Line 901 Incident Excluding Line 901 Incident [Member] Excluding Line 901 Incident Total costs and expenses Disposal Group, Including Discontinued Operation, Costs and Expenses Disposal Group, Including Discontinued Operation, Costs and Expenses Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Other long-term debt, net Other Other Long-Term Debt, Noncurrent Product sales revenues Product sales Sales Product [Member] Cash paid for: Supplemental Cash Flow Information [Abstract] Other Performance Measure, Amount Other Performance Measure, Amount Cactus II Cactus II Pipeline LLC [Member] Cactus II Pipeline LLC Inventory [Line Items] Inventory [Line Items] Short-term debt Short-term debt Debt, Current Entity Address, State or Province Entity Address, State or Province Long-term assets of discontinued operations (Note 2) Total long-term assets of discontinued operations Disposal Group, Including Discontinued Operation, Assets, Noncurrent Related Party [Domain] Related and Nonrelated Parties [Domain] Total current liabilities Liabilities, Current Other current liabilities Other Current Liabilities [Member] PARTNERS’ CAPITAL Partners' Capital, Including Portion Attributable to Noncontrolling Interest [Abstract] Effect of translation adjustment - discontinued operations Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Discontinued Operation Inventory [Axis] Inventory [Axis] Depreciation and amortization of unconsolidated entities Depreciation And Amortization Of Unconsolidated Entities The reporting entity’s proportionate share of depreciation and amortization expense and gains or losses on significant asset sales of unconsolidated entities. GP LLC Plains All American G P L L C [Member] Represents the information pertaining to Plains All American GP LLC, ("GP LLC"), in which the reporting entity owns a managing member interest. Derivative Instrument [Axis] Derivative Instrument [Axis] Individual: Individual [Axis] PROPERTY AND EQUIPMENT Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, before Accumulated Depreciation and Amortization Repurchase of Series A preferred units by a subsidiary (Note 7) Payments for repurchase of preferred stock and preference stock Payments for Repurchase of Preferred Stock and Preference Stock Other payments to acquire businesses Other Payments to Acquire Businesses Organization and basis of presentation Organization and Basis of Presentation [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Other current assets Other Assets, Current Entity [Domain] Entity [Domain] Amortization Amortization Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Remaining performance obligations, expected timing of satisfaction, period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Interest, net of amounts capitalized Interest Paid, Excluding Capitalized Interest, Operating Activity Contributions from noncontrolling interests Proceeds from Noncontrolling Interests Document Fiscal Year Focus Document Fiscal Year Focus Long-term operating lease right-of-use assets, net Operating Lease, Right-of-Use Asset Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Noncontrolling interests in subsidiaries (as a percent) Subsidiary, Ownership Percentage, Noncontrolling Owner Environmental Remediation Contingency [Axis] Environmental Remediation Contingency [Axis] Entity Interactive Data Current Entity Interactive Data Current Basic and Diluted Net Income Per Share Basic and Diluted Net Income Per Class A Share [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Exchange Traded Exchange Traded [Member] Contributions from noncontrolling interests Partners' Capital Account, Contributions CASH FLOWS FROM OPERATING ACTIVITIES Cash Provided by (Used in) Operating Activity, Continuing Operation [Abstract] Linefill (price/unit of measure) (usd per barrel) Inventory, Weighted Average Price Per Unit, Linefill Inventory, Weighted Average Price Per Unit, Linefill Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Segment Information Segment Reporting Disclosure [Text Block] Derivatives Not Designated as a Hedge Not Designated as Hedging Instrument [Member] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Repurchase of units by a subsidiary Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Repurchase of Shares by Subsidiary Total debt Debt and Lease Obligation Schedule of Distributions Distributions Made to Limited Partner, by Distribution [Table Text Block] Ownership [Domain] Ownership [Domain] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Commodity Price Risk Hedging: Price Risk Derivatives [Abstract] Weighted Average Weighted Average [Member] Self-insured retention Loss Contingency, Self-Insured Retention Loss Contingency, Self-Insured Retention Deferred tax asset Deferred Income Tax Assets, Net Exchange Right exercises (shares) Limited Partners Capital Account Shares Issued (Exchanged) in Exchange Right Exercises Represents the number of shares issued (exchanged) in connection with Exchange Right exercises. Depreciation and amortization Depreciation and amortization Depreciation and amortization Depreciation, Depletion and Amortization Other long-term assets, net Other Assets, Noncurrent Entity Central Index Key Entity Central Index Key PEO Name PEO Name Other Other Long Term Debt [Member] Other types of long-term debt not specifically identified. Increase (Decrease) in Partners' Capital Increase (Decrease) in Partners' Capital [Roll Forward] Total revenues Total revenues Revenues from related parties Revenues Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Schedule of Activity for Class A Shares, Class B Shares and Class C Shares Schedule of Stockholders Equity [Table Text Block] Purchases and related costs Disposal Group, Including Discontinued Operation, Purchases and Related Costs Disposal Group, Including Discontinued Operation, Purchases and Related Costs Partner Capital Components [Axis] Partner Capital Components [Axis] Arrangement Duration Trading Arrangement Duration Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Segments [Axis] Segments [Axis] Schedule of Derivative Assets and Liabilities on Condensed Consolidated Balance Sheets on a Gross Basis Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Linefill Linefill subtotal, carrying value Linefill Crude oil or NGL linefill in pipelines, tanks and caverns that are owned by the entity. Linefill is intended for long-term use. Ownership interest (as a percent) Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest Other Other Comprehensive Income, Other, Net of Tax Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Class of Stock [Domain] Class of Stock [Domain] Limited Partners Limited Partner [Member] Local Phone Number Local Phone Number Derivative position notional amount (in terawatt hours) Derivative, Nonmonetary Notional Amount, Energy Measure Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Arrangements and Non-arrangement Transactions [Domain] Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Inventory, Current [Table] Inventory, Current [Table] Other investing activities Payment for (Proceeds from) Other Investing Activity Subsequent Event Type [Axis] Subsequent Event Type [Axis] Class A shareholders (197,743,624 and 197,465,699 shares outstanding, respectively) Limited Partners' Capital Account Stock repurchased and retired during period (shares) Stock Repurchased and Retired During Period, Shares Long Long [Member] Series A Preferred Units Series A Preferred Units [Member] Series A preferred units representing limited partner interests in the entity that rank pari passu with Series B preferred units, and senior to our common units and to each other classes or series of our equity securities with respect to distribution rights and rights upon liquidation and are convertible into common units by the holder or the entity under certain conditions. Cash consideration Disposal Group, Including Discontinued Operation, Consideration (Gains)/losses on asset sales, net Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax ASSETS Assets [Abstract] Long-term inventory Long-term inventory subtotal, carrying value Inventory, Noncurrent Underlying Security Market Price Change Underlying Security Market Price Change, Percent 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Three Crude oil basis spread position Crude Oil Grade Basis Position [Member] Represents the derivative instruments that hedge crude oil purchases based on grade basis differentials. Balance Sheet Location [Axis] Statement of Financial Position Location, Balance [Axis] Debt Instrument [Axis] Debt Instrument [Axis] EMG Medallion 2 Holdings EMG Medallion 2 Holdings, LLC [Member] EMG Medallion 2 Holdings, LLC Business Combination [Line Items] Business Combination [Line Items] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Total borrowings Proceeds from Short-Term Debt Entity Address, Address Line One Entity Address, Address Line One 8 forward starting interest rate swaps (30-year), 3.09% Eight Forward Starting Thirty Year Interest Rate Swaps 3.09 Percent [Member] Eight Forward Starting Thirty Year Interest Rate Swaps 3.09 Percent Long-term operating lease liabilities Disposal Group, Including Discontinued Operation, Operating Lease Liabilities, Noncurrent Disposal Group, Including Discontinued Operation, Operating Lease Liabilities, Noncurrent Entity Address, Address Line Two Entity Address, Address Line Two Estimated undiscounted reserve for environmental liabilities, short-term [Extensible Enumeration] Environmental Loss Contingency, Current, Statement of Financial Position [Extensible Enumeration] Investment, Name [Axis] Investment, Name [Axis] Debt instrument, interest rate (as a percent) Debt Instrument, Interest Rate, Stated Percentage Long-term operating lease liabilities Operating Lease, Liability, Noncurrent Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] Ownership [Axis] Ownership [Axis] Schedule of Debt Instruments [Table] Schedule of Debt Instruments [Table] A table or schedule providing information pertaining to short-term and long-term debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. Derivatives and Risk Management Activities Derivative Instruments and Hedging Activities Disclosure [Text Block] Gross Position - Assets Derivative Asset, Subject to Master Netting Arrangement, before Offset Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Fair Value as of Grant Date Award Grant Date Fair Value Entity Registrant Name Entity Registrant Name Schedule of Limited Partners' Capital Account by Class [Table] Partners' Capital, Limited Partner's Capital Account, Class [Table] Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Total costs and expenses Costs and Expenses Related Party Transaction [Line Items] Related Party Transaction [Line Items] Public Public Unit Holders [Member] Public Unit Holders [Member] Incremental net income attributable to PAGP resulting from assumed exchange of AAP Management Units Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities Document Quarterly Report Document Quarterly Report Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Counterparty Name [Domain] Counterparty Name [Domain] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Operating segments number Number of Operating Segments Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Other Other Inventory [Member] Category of inventory not separately disclosed. Schedule of Debt Schedule of Debt [Table Text Block] Related Party [Axis] Related and Nonrelated Parties [Axis] Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Cash provided by operating activities - continuing operations Cash Provided by (Used in) Operating Activity, Continuing Operation Services revenues Services Service [Member] Business combination, measurement input Business Combination, Measurement Input Business Combination, Measurement Input Other current liabilities Disposal Group, Including Discontinued Operation, Other Liabilities, Current Other long-term liabilities and deferred credits Other Noncurrent Liabilities [Member] Type of Arrangement and Non-arrangement Transactions [Axis] Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Restatement Determination Date: Restatement Determination Date [Axis] Acquisition amount Payments to Acquire Businesses, Gross Non-PEO NEO Non-PEO NEO [Member] Net fair value of interest rate hedges Interest Rate Cash Flow Hedge Derivative at Fair Value, Net Outstanding letters of credit Letters of credit Letters of Credit Outstanding, Amount Position [Domain] Position [Domain] Common Units Common Units [Member] Common units representing limited partner interests in the entity. Cash used in investing activities - continuing operations Cash Provided by (Used in) Investing Activity, Continuing Operation Other financing activities Proceeds from (Payment for) Other Financing Activity Name Trading Arrangement, Individual Name Assets: Disposal Group, Including Discontinued Operation, Assets [Abstract] All Award Types Award Type [Domain] Long-term assets: Disposal Group, Including Discontinued Operation, Assets, Noncurrent [Abstract] Equity Awards Adjustments Equity Awards Adjustments [Member] Other Other Noncash Income (Expense) Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Substantially all trade accounts receivable, net, maximum age of balances past their invoice date Trade Accounts Receivable Net Disclosure of Maximum Age of Balances Past Invoice Date The maximum number of days past their invoice date for substantially all of the trade accounts receivable. Disaggregation of Revenue Disaggregation of Revenue [Line Items] Compensation Amount Outstanding Recovery Compensation Amount Debt instrument face value Debt Instrument, Face Amount Inventory, volumes (in barrels) Inventory, Volumes Current The volume of current inventory as of the balance sheet date. Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Field operating costs Field operating costs Operating Costs and Expenses Foreign currency derivatives Foreign Exchange Contract [Member] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Amounts recognized as revenue Contract with Customer, Liability, Revenue Recognized AAP Plains AAP L P [Member] Represents information pertaining to Plains, AAP L.P (AAP). MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Name Awards Close in Time to MNPI Disclosures, Individual Name Line 901 Incident Line 901 Incident [Member] Represents information pertaining to the crude oil release from the Las Flores to Gaviota Pipeline in Santa Barbara County, California. Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Schedule of Calculation of Basic and Diluted Net Income Per Class A Share [Table] Schedule of Calculation of Basic and Diluted Net Income Per Class A Share [Table] Schedule reflecting the calculation of basic and diluted net income per share. Distribution Type [Axis] Distribution Type [Axis] Changes in assets and liabilities, net of acquisitions Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital REVENUES Revenues [Abstract] Net income attributable to PAGP from discontinued operations including incremental net income from assumed exchange of AAP Management Units Income (Loss) From Discontinued Operations, Net Of Tax, Attributable To Parent, Including Diluted Securities Income (Loss) From Discontinued Operations, Net Of Tax, Attributable To Parent, Including Diluted Securities Inventory [Domain] Inventory [Domain] Net gain (loss) deferred in AOCI Accumulated Other Comprehensive Income (Loss), Net of Tax Total long-term debt Long-Term Debt and Lease Obligation Other current assets Disposal Group, Including Discontinued Operation, Other Assets, Current Cash Distribution Limited Partners' Capital Account, Distribution Amount Consolidated subsidiary, ownership interest (shares) Subsidiary of Limited Liability Company or Limited Partnership Ownership Interest Units The number of units of the subsidiary owned by the limited partnership representing limited partner interests. Total AOCI Including Portion Attributable to Noncontrolling Interest [Member] Environmental Remediation Contingency [Domain] Environmental Remediation Contingency [Domain] Segments [Domain] Segments [Domain] Schedule of Net Unrealized Gain (Loss) Recognized in AOCI for Derivatives Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block] Income Statement Location [Axis] Statement of Income Location, Balance [Axis] Terminalling, storage and other agreement revenues Terminalling, Long-Term Storage And Other Agreements Revenues [Member] Terminalling , Long-Term Storage And Other Agreements Revenues [Member] Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Schedule of Remaining Performance Obligations Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Liabilities: Disposal Group, Including Discontinued Operation, Liabilities [Abstract] Consolidated Entity Excluding VIE Consolidated Entity, Excluding Consolidated VIE [Member] Reclassification adjustments Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Balance Sheet Location [Domain] Statement of Financial Position Location, Balance [Domain] NGL NGL Natural Gas Liquids Segment [Member] Natural Gas Liquids Segment Inventory Inventory subtotal, carrying value Inventory, Net Estimated undiscounted reserve for environmental liabilities, short-term Accrued Environmental Loss Contingencies, Current Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Minimum Minimum [Member] Company Selected Measure Name Company Selected Measure Name Gross Position - Assets Derivative Liability, Subject to Master Netting Arrangement, Asset Offset Senior notes Senior Notes [Member] Schedule of Amortization Expense Finite-Lived Intangible Assets Amortization Expense [Table Text Block] Debt Debt Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Amount accrued to distributions payable Dividends Payable All Executive Categories All Executive Categories [Member] Minimum Volume Commitments Minimum Volume Commitment Agreements [Member] Agreements that require counterparties to deliver, transport or throughput a minimum volume over an agreed upon period, some of which include make-up rights. The Energy & Minerals Group The Energy & Minerals Group [Member] The Energy & Minerals Group Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Net Carrying Value Presented on the Balance Sheet, Total Derivative Assets (Liabilities), at Fair Value, Net Long-term inventory, volumes (in barrels) Inventory, Volumes, Noncurrent The volume of noncurrent inventory as of the balance sheet date. Total revenues Disposal Group, Including Discontinued Operation, Revenue OTHER ASSETS Other Assets, Noncurrent [Abstract] Diluted weighted average Class A shares outstanding (shares) Weighted Average Number of Shares Outstanding, Diluted Weighted average interest rate, short-term (as a percent) Short-Term Debt, Weighted Average Interest Rate, at Point in Time COMMITMENTS AND CONTINGENCIES (NOTE 10) Commitments and Contingencies Limited Partners' Capital Account, Class [Domain] Limited Partners' Capital Account, Class [Domain] Aggregate cost to clean-up and remediate Loss Contingency, Clean-Up And Remediate Aggregate Cost Loss Contingency, Clean-Up And Remediate Aggregate Cost Line 901 2015 Insurance Program Line 901 2015 Insurance Program [Member] Line 901 2015 Insurance Program Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Derivative [Table] Derivative [Table] Intangible assets Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived Finite-Lived Intangible Assets Finite-Lived Intangible Assets [Member] Business Combination [Axis] Business Combination [Axis] Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Small Business Entity Entity Small Business Ownership interests acquired percentage (as a percent) Business Combination, Voting Equity Interest Acquired, Percentage Shares outstanding (shares) Balance, beginning of period (shares) Balance, ending of period (shares) Limited Partners' Capital Account, Units Outstanding Acquisition amount, net to our interest Business Combination Consideration Transferred Net To Ownership Interest Amount of consideration transferred reflected on a net basis, representing the entity's proportionate share based on its ownership percentage of the less than wholly owned consolidated subsidiary. Noncontrolling Interests Noncontrolling Interest [Member] Diluted Net Income per Class A Share: Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share [Abstract] Document Transition Report Document Transition Report Settlement of terminated interest rate hedging instruments Net Cash (Paid) Received for Terminated Hedging Instruments The net cash (paid) received for terminated hedging instruments. Ownership interest in unconsolidated entity, prior to acquisition (as a percent) Equity Method Investment, Ownership Percentage Crude Oil Crude Oil Crude Oil Segment [Member] Crude Oil Segment Net borrowings/(repayments) under PAA commercial paper program (Note 6) Proceeds from (Repayments of) Commercial Paper Underlying Securities Award Underlying Securities Amount Deficiencies under minimum volume commitments, net Deficiencies Under Minimum Volume Commitments, Net Includes the impact of amounts billed to counterparties for their deficiency obligation, net of applicable amounts subsequently recognized into revenue. Certain agreements require counterparties to deliver, transport or throughput a minimum volume over an agreed upon period. Substantially all of such agreements were entered into with counterparties to economically support the return on the reporting entity's capital expenditure necessary to construct the related asset. Some of these agreements include make-up rights if the minimum volume is not met. A receivable from the counterparty is recorded in the period that services are provided or when the transaction occurs, including amounts for deficiency obligations from counterparties associated with minimum volume commitments. If a counterparty has a make-up right associated with a deficiency, the revenue attributable to the counterparty’s make-up right is deferred and is subsequently recognized at the earlier of when the deficiency volume is delivered or shipped, when the make-up right expires or when it is determined that the counterparty’s ability to utilize the make-up right is remote. Statement of Partners' Capital [Abstract] Statement of Partners' Capital [Abstract] Document Period End Date Document Period End Date PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Black Knight Midstream, LLC Black Knight Midstream, LLC [Member] Black Knight Midstream, LLC Power supply requirements Power Supply Requirements Contracts [Member] Represents the derivative instruments consisting of long power positions which hedge a portion of power supply requirements. Diluted Net Income per Class A Share Earnings Per Share, Diluted [Abstract] Partners' Capital and Distributions [Table] Partners' Capital and Distributions [Table] Disclosure reflecting information pertaining to Partners' Capital and related distributions. Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Losses on asset sales, net Losses on asset sales, net Losses on asset sales, net Gain (Loss) on Sale of Assets and Asset Impairment Charges Hedging Designation [Axis] Hedging Designation [Axis] Debt instrument fair value Debt Instrument, Fair Value Disclosure Scenario [Axis] Scenario [Axis] Schedule of Contract with Customer, Counterparty Deficiencies Contract with Customer, Counterparty Deficiencies [Table Text Block] Contract with Customer, Counterparty Deficiencies Document Type Document Type Level 3 Fair Value, Inputs, Level 3 [Member] Net Income Per Class A Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Minimum Volume Commitments Contract With Customer, Asset And Liability [Line Items] [Line Items] for Contract With Customer, Asset And Liability [Table] Other long-term assets, net Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent Loss Contingencies [Table] Loss Contingencies [Table] Other trade accounts receivables and other receivables Accounts and Other Receivables, Net, Current Product and Service [Axis] Product and Service [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Working capital and other assets and liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Working Capital and Other Assets and Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Working Capital and Other Assets and Liabilities Revenues from contracts with customers Revenue from Contract with Customer, Excluding Assessed Tax All Individuals All Individuals [Member] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Additions to property, equipment and other Payments to Acquire Property, Plant, and Equipment General and administrative expenses Disposal Group, Including Discontinued Operation, General and Administrative Expense Name Forgone Recovery, Individual Name Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Cash provided by operating activities - discontinued operations Cash Provided by (Used in) Operating Activity, Discontinued Operation Disposal Group Classification [Axis] Disposal Group Classification [Axis] Remaining undiscounted liability Loss Contingency Accrual Depreciation and amortization Disposal Group, Including Discontinued Operation, Depreciation and Amortization Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Disposal Group Name [Axis] Disposal Group Name [Axis] Public offering price (as a percent) Senior Notes Public Offering Price Senior Notes Public Offering Price Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Term of derivative contract Derivative, Term of Contract Schedule of Terms of Outstanding Interest Rate Derivatives Schedule of Derivative Instruments [Table Text Block] Total significant segment expenses Significant Segment Expenses Significant Segment Expenses Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Schedule of Reconciliation of Segment Adjusted EBITDA to Net income attributable to PAGP Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Income from discontinued operations, net of tax Income from discontinued operations before tax Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax CURRENT LIABILITIES Liabilities, Current [Abstract] Average rate locked (as a percent) Derivative, Average Fixed Interest Rate Contract Liabilities Change In Contract With Customer, Liability [Roll Forward] Change In Contract With Customer, Liability [Roll Forward] Transaction Type [Axis] Transaction Type [Axis] Schedule of Impact of Derivatives Recognized in Earnings Derivative Instruments, Gain (Loss) [Table Text Block] Long-term inventory (price/unit of measure) (usd per barrel) Inventory, Weighted Average Price Per Unit, Noncurrent Inventory, Weighted Average Price Per Unit, Noncurrent Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Coverage limit under insurance program Insurance Coverage Limit Insurance Coverage Limit Level 1 Fair Value, Inputs, Level 1 [Member] (Gain)/loss on foreign currency revaluation Gain (Loss), Foreign Currency Transaction, before Tax Partner Type of Partners' Capital Account, Name [Domain] Partner Type of Partners' Capital Account, Name [Domain] 5.95% Senior notes due june 2035 Senior Notes Due In June 2035 At 5.95 Percent [Member] Senior Notes Due In June 2035 At 5.95 Percent Schedule of Related Party Transactions, by Related Party [Table] Related Party Transaction [Table] Inventory (price/unit of measure) (usd per barrel) Inventory, Weighted Average Price Per Unit, Current Inventory, Weighted Average Price Per Unit, Current Diluted net income per Class A share (usd per share) Earnings Per Share, Diluted Forecast Forecast [Member] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Title of 12(b) Security Title of 12(b) Security Total partners’ capital Beginning balance Ending balance Partners' Capital, Including Portion Attributable to Noncontrolling Interest Pipeline revenues supported by minimum volume commitments and capacity agreements Pipeline Revenues Supported By Minimum Volume Commitments And Long-Term Capacity Agreements [Member] Pipeline revenues supported by minimum volume commitments and long-term capacity agreements Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Estimated undiscounted reserve for environmental liabilities, long-term Accrued Environmental Loss Contingencies, Noncurrent Segment general and administrative expenses General And Administrative Expense (Excluding Unallocated Amount) General And Administrative Expense (Excluding Unallocated Amount) Earnings Per Share [Abstract] Distributions to PAGP SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Consolidated Subsidiaries Consolidation Items [Domain] Consolidation Items [Domain] INCOME FROM DISCONTINUED OPERATIONS, NET OF TAX (NOTE 2) INCOME FROM DISCONTINUED OPERATIONS, NET OF TAX (NOTE 2) Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Recoveries from insurance carriers Loss Contingency, Receivable, Proceeds Foreign currency revaluation Net Gain (Loss) On Foreign Currency Revaluation Includes gains and losses from the revaluation of foreign currency transactions and monetary assets and liabilities. Short-term Debt, Type [Axis] Short-Term Debt, Type [Axis] Partners' Capital Notes [Abstract] Partners' Capital Notes [Abstract] Clean-up and remediation activities Loss Contingency, Clean-Up And Remediation Activities Loss Contingency, Clean-Up And Remediation Activities Distributions paid to Class A shareholders (Note 7) Distribution Made to Limited Partner, Cash Distributions Paid Income taxes, net of amounts refunded Income Taxes Paid, Net 2027 Finite-Lived Intangible Asset, Expected Amortization, Year Two Award Timing Disclosures [Line Items] NGL Natural Gas Liquids (NGL) [Member] Schedule of Inventory Schedule of Inventory, Current [Table Text Block] Current assets of discontinued operations (Note 2) Total current assets of discontinued operations Disposal Group, Including Discontinued Operation, Assets, Current Class B Shares Shares Class B [Member] Represents the classification of shares representing limited partner interests in the company that are not held by the public. Class B shareholders have equal voting rights with Class A shareholders but are not entitled to receive distributions. Long-term debt Long-Term Debt, Gross Measurement Frequency [Domain] Measurement Frequency [Domain] Property and equipment, net Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Partner Type [Axis] Partner Type [Axis] Distributions to noncontrolling interests Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Property and equipment, net Disposal Group, Including Discontinued Operation, Property, Plant And Equipment, Net Disposal Group, Including Discontinued Operation, Property, Plant And Equipment, Net NET INCOME ATTRIBUTABLE TO PAGP Net Income (Loss) Attributable to Parent Investments in unconsolidated entities Capital Contributions to Equity Method Investees Cash outflow for capital contributions subsequent to the initial purchase of interest in equity method investments. Intersegment revenues elimination Intersegment Eliminations [Member] Expiration Date Trading Arrangement Expiration Date LONG-TERM LIABILITIES Liabilities, Noncurrent [Abstract] Partners' Capital and Distributions Partners Capital and Distribution [Line Items] No definition available. Class C Shares Shares Class C [Member] Class C shares represent a non-economic limited partner interest that provides the holder the right to vote in elections of eligible directors together with the holders of Class A and Class B shares. Segment Reporting Information Segment Reporting Information [Line Items] Other revenues Revenue Not from Contract with Customer Adoption Date Trading Arrangement Adoption Date Total Inventory, Current and Noncurrent This element represents the aggregate of current and non-current inventory, including linefill. Shares issued, price per share (in dollars per unit) Shares Issued, Price Per Share Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Series A Preferred Stock Series A Preferred Stock [Member] Entity Current Reporting Status Entity Current Reporting Status Derivatives and Risk Management Activities Derivative [Line Items] Initial margin Initial Margin The amount of cash or securities required by a broker or counterparty as security for a trading or derivatives securities position. Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] CASH FLOWS FROM FINANCING ACTIVITIES Cash Provided by (Used in) Financing Activity, Continuing Operation [Abstract] Customer Relationships Customer Relationships [Member] Segment amounts attributable to noncontrolling interests Segment Amounts Attributable To Noncontrolling Interests Segment Amounts Attributable To Noncontrolling Interests OPERATING INCOME Operating Income (Loss) Line of credit Line of Credit [Member] Consolidated Entities [Domain] Consolidated Entities [Domain] Transaction [Domain] Transaction [Domain] Time spread on hedging anticipated crude oil lease gathering purchases Time Spread On Hedge Anticipated Crude Oil Lease Gathering Purchase Contracts [Member] Represents the derivative instruments utilized to hedge anticipated crude oil lease gathering purchases. Translation Adjustments Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Executive Category: Executive Category [Axis] Changes in Accumulated Other Comprehensive Income/(Loss) AOCI Including Portion Attributable to Noncontrolling Interest [Abstract] Terminalling, Storage and Other Terminalling, Storage and Other [Member] Terminalling, Storage and Other Noncontrolling interests Partners' Capital Attributable to Noncontrolling Interest Class of Stock [Axis] Class of Stock [Axis] Current Fiscal Year End Date Current Fiscal Year End Date Subsequent Event Type [Domain] Subsequent Event Type [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Current liabilities of discontinued operations (Note 2) Total current liabilities of discontinued operations Disposal Group, Including Discontinued Operation, Liabilities, Current Other income, net Other income, net Other Nonoperating Income (Expense) Statement [Table] Statement [Table] Long-term inventory costing adjustments Long-Term Inventory Costing Adjustments Includes the impact of changes (resulting from fluctuations in market prices) in the average cost of crude oil and NGL inventory that is comprised of minimum working inventory requirements in third-party assets and other working inventory that is needed for the entity’s commercial operations which is considered necessary to conduct the entity’s operations and which the entity intends to carry for the foreseeable future, as well as writedowns of such inventory that result from price declines. Derivative liability Net Carrying Value Presented on the Balance Sheet Derivative Liability Reconciliation of net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Deferred income tax expense from continuing operations Deferred income tax expense Deferred Income Tax Expense (Benefit) Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Net income attributable to noncontrolling interests from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Attributable to Noncontrolling Interest Interest rate derivatives Interest Rate Contract [Member] Field operating costs Disposal Group, Including Discontinued Operation, Operating Expense Offsetting Assets, Liabilities [Table] Offsetting Assets, Liabilities [Table] Disclosure of information about derivative and financial assets/ (liabilities) that are subject to offsetting, including enforceable master netting arrangements. Schedule of Environmental Loss Contingencies Schedule of Environmental Loss Contingencies by Site [Table Text Block] Trade accounts receivable and other receivables, net Trade accounts receivable and other receivables, net Trade accounts receivable and other receivables, net from related parties Receivables, Net, Current Counterparty deficiencies, billed and collected Beginning balance Ending balance Contract with Customer, Liability Distributions on earnings from unconsolidated entities Proceeds from Equity Method Investment, Distribution Schedule of Derivative Financial Assets and Liabilities Accounted for at Fair Value on a Recurring Basis, by Level within the Fair Value Hierarchy Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Organization and Basis of Consolidation and Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less) Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less) Antidilutive securities excluded from computation of earnings per share (shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount All Adjustments to Compensation All Adjustments to Compensation [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Amendment Flag Amendment Flag Gain on investments in unconsolidated entities, net Gain on investments in unconsolidated entities, net (Note 12) Gains (Losses) on Investments in Unconsolidated Entities, Net Gains (Losses) on Investments in Unconsolidated Entities, Net 4 Treasury Locks (10-year) 4.00% Four Treasury Locks Ten Year Interest Rate Swaps 4.00 Percent [Member] Four Treasury Locks Ten Year Interest Rate Swaps 4.00 Percent Termination Date Trading Arrangement Termination Date Net cash used in financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Measure: Measure [Axis] BridgeTex Pipeline Company, LLC BridgeTex Pipeline Company, LLC [Member] BridgeTex Pipeline Company, LLC [Member] Number of interest rate derivatives Number of Interest Rate Derivatives Held Average fixed exchange rate (cad per usd) Derivative, Average Fixed Exchange Rate Derivative, Average Fixed Exchange Rate Other long-term liabilities and deferred credits Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Fair value, liability Total net derivative asset/(liability) Derivative, Fair Value, Net Basic weighted average Class A shares outstanding (shares) Weighted Average Number of Shares Outstanding, Basic Purchases and related costs Purchases and related costs Cost of Product and Service Sold Disposal Group Classification [Domain] Disposal Group Classification [Domain] Schedule of Computation of Basic and Diluted Net Income Per Class A Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Other AOCI, Other, Including Portion Attributable To Noncontrolling Interest [Member] AOCI, Other, Including Portion Attributable to Noncontrolling Interest [Member] Receivable for remaining portion of release costs probable of recovery from insurance Loss Contingency, Receivable Other (shares) Partners' Capital, Units, Other Changes in the number of units outstanding included in the statement of changes in partners' capital which are not separately disclosed or provided for elsewhere in the taxonomy. Cheyenne Pipeline LLC Cheyenne Pipeline LLC [Member] Cheyenne Pipeline LLC Segment Reporting [Abstract] Segment Reporting [Abstract] Line 48 Incident Line 48 Incident [Member] Represents information pertaining to the crude oil release in Carson, California. Offsetting Assets, Liabilities [Line Items] Derivative and financial assets and liabilities subject to collateral netting Offsetting Assets, Liabilities [Line Items] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount OTHER INCOME/(EXPENSE) Nonoperating Income (Expense) [Abstract] Entity Tax Identification Number Entity Tax Identification Number Scenario [Domain] Scenario [Domain] Series B Preferred Units Series B Preferred Units [Member] Series B preferred units representing perpetual limited partner interests in the entity that rank pari passu with Series A preferred units and are not redeemable at the opiton of the holders under any circumstances. COSTS AND EXPENSES Costs and Expenses [Abstract] Valuation Technique, Discounted Cash Flow Valuation Technique, Discounted Cash Flow [Member] Derivative Liabilities Offsetting Derivative Liabilities [Abstract] Ironwood Midstream Energy Partners II, LLC Ironwood Midstream Energy Partners II, LLC [Member] Ironwood Midstream Energy Partners II, LLC Trade accounts payable Trade accounts payable to related parties Accounts Payable, Trade, Current Derivative Instruments Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest [Member] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Short Short [Member] Consolidated Entities [Axis] Consolidated Entities [Axis] Estimated undiscounted reserve for environmental liabilities Accrual for Environmental Loss Contingencies, Gross Trade accounts receivable and other receivables, net Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net Schedule of Distributions paid to Noncontrolling Interests in Consolidated Joint Ventures Distributions Made to Noncontrolling Interests [Table Text Block] Distributions Made to Noncontrolling Interests Interest expense (net of capitalized interest of $3, $2, $5 and $4, respectively) Interest expense, net Interest Expense, Nonoperating Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Segment Adjusted EBITDA Segment Adjusted EBITDA Revenues and equity earnings in unconsolidated entities less (a) purchases and related costs, (b) field operating costs and (c) segment general and administrative expenses, plus (d) our proportionate share of the depreciation and amortization expense of unconsolidated entities, further adjusted (e) for certain selected items including (i) gains and losses on derivative instruments that are related to underlying activities in another period (or the reversal of such adjustments from a prior period), gains and losses on derivatives that are either related to investing activities (such as the purchase of linefill) or purchases of long-term inventory, and inventory valuation adjustments, as applicable, (ii) long-term inventory costing adjustments, (iii) charges for obligations that are expected to be settled with the issuance of equity instruments, (iv) amounts related to deficiencies associated with minimum volume commitments, net of the applicable amounts subsequently recognized into revenue and (v) other items that our Chief Operating Decision Maker believes are integral to understanding our core segment operating performance and (f) to exclude the portion of all preceding items that is attributable to noncontrolling interests in consolidated joint venture entities. Loss Contingencies [Line Items] Loss Contingencies [Line Items] Gross Position - Liabilities Derivative Asset, Subject to Master Netting Arrangement, Liability Offset Anticipated net sales of crude oil and NGL inventory Anticipated Net Sales Of Inventory [Member] Represents the derivative instruments in a net short position related to anticipated net sales of crude oil and NGL inventory. Currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Insider Trading Arrangements [Line Items] Segment Reporting, Reconciling Item, Corporate Nonsegment Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Security Exchange Name Security Exchange Name Purchases and related costs from related parties Related Party Transaction, Purchases from Related Party Interest Rate Risk Hedging Interest Rate Derivatives [Abstract] Total long-term liabilities Liabilities, Noncurrent Long-term inventory Disposal Group, Including Discontinued Operation, Inventory, Noncurrent Distributions paid to noncontrolling interests (Note 7) Payments of Ordinary Dividends, Noncontrolling Interest Shares outstanding Limited Partners' Capital Account [Line Items] Partners' Capital and Distributions Partners' Capital Notes Disclosure [Text Block] Preferred unit distribution amount Dividends, Preferred Stock Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Equity-indexed compensation expense Equity Indexed Compensation Expense Awards That Will Be Settled In Units Expense associated with equity-indexed compensation awards that will be settled in units. 4 forward starting interest rate swaps (30-year), 3.76% Four Forward Starting Thirty Year Interest Rate Swaps 3.76 Percent [Member] Four Forward Starting Thirty Year Interest Rate Swaps 3.76 Percent Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Other current liabilities Other Liabilities, Current Asset Class [Domain] Asset Class [Domain] Estimated undiscounted reserve for environmental liabilities, long-term [Extensible Enumeration] Environmental Loss Contingency, Noncurrent, Statement of Financial Position [Extensible Enumeration] Statement [Line Items] Statement [Line Items] Variation margin posted/(returned) Variation Margin Posted (Returned) Cash posted by (returned to) the reporting entity to (from) a broker or counterparty to comply with initial margin requirements. Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Consolidation Items [Axis] Consolidation Items [Axis] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and Cash Equivalent Inventory Disposal Group, Including Discontinued Operation, Inventory, Current Transaction-related expenses Transaction-related expenses Expenses associated with joint venture transactions and acquisitions Counterparty Name [Axis] Counterparty Name [Axis] Distribution Type [Domain] Distribution Type [Domain] Common Stock Common Stock [Member] AAP Units AAP Units [Member] AAP Units Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Net increase in cash and cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation