Partners' Capital and Distributions - Subsidiary Common Units Distributions (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				6 Months Ended
	Sep. 30, 2026	Jun. 30, 2026	Mar. 31, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Partners' Capital and Distributions [Line Items]
Distributions		$ 449		$ 418	$ 898	$ 874
Cash Distribution \| Class C Shares
Partners' Capital and Distributions [Line Items]
Distributions		$ 295	$ 295
Distribution per common unit (usd per share)		$ 0.4175	$ 0.4175
Cash Distribution \| Class C Shares \| Subsequent Event
Partners' Capital and Distributions [Line Items]
Distributions	$ 295
Distribution per common unit (usd per share)	$ 0.4175
Public \| Cash Distribution \| Class C Shares
Partners' Capital and Distributions [Line Items]
Distributions		$ 198	$ 198
Public \| Cash Distribution \| Class C Shares \| Subsequent Event
Partners' Capital and Distributions [Line Items]
Distributions	$ 198
AAP \| Cash Distribution \| Class C Shares
Partners' Capital and Distributions [Line Items]
Distributions		$ 97	$ 97
AAP \| Cash Distribution \| Class C Shares \| Subsequent Event
Partners' Capital and Distributions [Line Items]
Distributions	$ 97