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Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP).

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Organization and Basis of Consolidation and Presentation (Details) shares in Millions, $ in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2026 USD ($) segment shares	Mar. 31, 2025 USD ($)	Mar. 31, 2026 CAD ($)
Organization Consolidation and Presentation of Financial Statements [Line Items]
Operating segments number \| segment	2
Current income tax expense (benefit)	$ 216	$ 7
Held-for-Sale \| NGL Business
Organization Consolidation and Presentation of Financial Statements [Line Items]
Cash consideration	3,750		$ 5,150
Derivative liability	15
Held-for-Sale \| NGL Business \| Plains Canada Liquid Pipelines ULC
Organization Consolidation and Presentation of Financial Statements [Line Items]
Current income tax expense (benefit)	$ 216
PAA \| AAP
Organization Consolidation and Presentation of Financial Statements [Line Items]
Ownership interest (units) \| shares	233.0
Ownership interest (as a percent)	31.00%
AAP \| PAGP
Organization Consolidation and Presentation of Financial Statements [Line Items]
Ownership interest (as a percent)	85.00%