Partners' Capital and Distributions - Distributions to Noncontrolling Interests (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Partners Capital and Distribution [Line Items]
Distributions paid		$ 1,330	$ 1,083	$ 729
Noncontrolling Interests
Partners Capital and Distribution [Line Items]
Distributions paid		333	298	14
Cash Distribution | Noncontrolling Interests | Consolidated Joint Venture Entities
Partners Capital and Distribution [Line Items]
Distributions paid		333	298	14
Cash Distribution | Noncontrolling Interests | Plains Oryx Permian Basin LLC
Partners Capital and Distribution [Line Items]
Distributions paid	$ 54	249	273
Cash Distribution | Noncontrolling Interests | Cactus II Pipeline LLC
Partners Capital and Distribution [Line Items]
Distributions paid		63	4
Cash Distribution | Noncontrolling Interests | Red River
Partners Capital and Distribution [Line Items]
Distributions paid		$ 21	$ 21	$ 14