Organization and Basis of Consolidation and Presentation (Details) shares in Millions, $ in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2025 USD ($) segment shares	Mar. 31, 2026 USD ($)	Mar. 31, 2026 CAD ($)	Dec. 31, 2024 USD ($)
Organization and basis of presentation
Operating segments number | segment	2
Deferred tax asset	$ 1,157			$ 1,220
Forecast | Held-for-Sale | NGL Business
Organization and basis of presentation
Cash consideration		$ 3,750	$ 5,150
Derivative liability		$ 45
Consolidated Entity Excluding VIE
Organization and basis of presentation
Deferred tax asset	$ 1,157			$ 1,220
AAP
Organization and basis of presentation
Ownership interest (as a percent)	85.00%
Consolidated subsidiary, ownership interest (in shares) | shares	197.9
GP LLC
Organization and basis of presentation
Ownership interest (as a percent)	100.00%
PAA | AAP
Organization and basis of presentation
Ownership interest (as a percent)	31.00%
Consolidated subsidiary, ownership interest (in shares) | shares	233.0