Investments in Unconsolidated Entities - Equity Method Investments (Details) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2022 USD ($) Pipeline	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2023	Nov. 30, 2022	Oct. 31, 2022	Sep. 30, 2022	Jul. 31, 2022	Jun. 30, 2022
Investments in Unconsolidated Entities
Investments in unconsolidated entities	$ 3,084	$ 2,820	$ 3,084	$ 3,805
Gains/(losses) on investments in unconsolidated entities, net		28	346	2
Capital contributions to equity method investees excluding capitalized interest		29	13	$ 82
Amount by which investments in unconsolidated entities exceeded our share of the underlying equity in the net assets	204	$ 229	204
OMOG JV LLC (“OMOG”)
Investments in Unconsolidated Entities
Additional interest acquired (as a percent)					43.00%
Advantage Pipeline Holdings LLC
Investments in Unconsolidated Entities
Additional interest acquired (as a percent)									50.00%
Cactus II Pipeline LLC
Investments in Unconsolidated Entities
Additional interest acquired (as a percent)						5.00%
BridgeTex Pipeline Company, LLC (“BridgeTex”)
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity prior to acquisition (as a percent)		20.00%
Investments in unconsolidated entities	403	$ 363	403
Capline Pipeline Company LLC (“Capline”)
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity prior to acquisition (as a percent)		54.00%
Investments in unconsolidated entities	539	$ 535	539
Diamond Pipeline LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity prior to acquisition (as a percent)		50.00%
Investments in unconsolidated entities	460	$ 450	460
Eagle Ford Pipeline LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity prior to acquisition (as a percent)		50.00%
Investments in unconsolidated entities	371	$ 370	371
Eagle Ford Terminals Corpus Christi LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity prior to acquisition (as a percent)		50.00%
Investments in unconsolidated entities	118	$ 116	118
OMOG JV LLC (“OMOG”)
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity prior to acquisition (as a percent)								40.00%
Investments in unconsolidated entities	$ 211		$ 211
OMOG JV LLC (“OMOG”) | Acquisition of Additional Interest in Exchange for Contribution of Pipeline Assets
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity prior to acquisition (as a percent)	57.00%		57.00%
Number of pipelines or partial pipelines contributed | Pipeline	2
Gains/(losses) on investments in unconsolidated entities, net	$ (25)
Saddlehorn Pipeline Company, LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity prior to acquisition (as a percent)		30.00%
Investments in unconsolidated entities	197	$ 192	$ 197
White Cliffs Pipeline, LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity prior to acquisition (as a percent)		36.00%
Investments in unconsolidated entities	150	$ 138	150
Wink to Webster Pipeline LLC (“W2W Pipeline”)
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity prior to acquisition (as a percent)		16.00%
Investments in unconsolidated entities	357	$ 380	357
Other investments
Investments in Unconsolidated Entities
Investments in unconsolidated entities	$ 278	$ 276	$ 278
Advantage Pipeline Holdings LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity prior to acquisition (as a percent)										50.00%
Cactus II Pipeline LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity prior to acquisition (as a percent)							65.00%