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Investments in Unconsolidated Entities Investments in Unconsolidated Entities (Details) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2021 USD ($) bbl	Jun. 30, 2019	Dec. 31, 2018 USD ($)
Investments in Unconsolidated Entities
Investments in unconsolidated entities		$ 3,485			$ 2,702
Carrying value of undivided joint interest		$ 15,257			14,787
Advantage Pipeline Holdings LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity		50.00%
Investments in unconsolidated entities		$ 74			72
BridgeTex Pipeline Company, LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity		20.00%
Investments in unconsolidated entities		$ 432			435
Cactus II Pipeline LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity		65.00%
Investments in unconsolidated entities		$ 666			455
Caddo Pipeline LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity		50.00%
Investments in unconsolidated entities		$ 66			65
Capline Pipeline Company LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity		54.00%
Investments in unconsolidated entities		$ 462
Fair value of investment in unconsolidated entity	$ 444
Cheyenne Pipeline LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity		50.00%
Investments in unconsolidated entities		$ 44			44
Diamond Pipeline LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity		50.00%
Investments in unconsolidated entities		$ 476			479
Eagle Ford Pipeline LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity		50.00%
Investments in unconsolidated entities		$ 386			383
Eagle Ford Terminals Corpus Christi LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity		50.00%
Investments in unconsolidated entities		$ 124			108
Midway Pipeline LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity		50.00%
Investments in unconsolidated entities		$ 76			78
Red Oak Pipeline LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity		50.00%
Investments in unconsolidated entities		$ 3
Saddlehorn Pipeline Company, LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity		40.00%
Investments in unconsolidated entities		$ 227			215
Settoon Towing, LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity		50.00%
Investments in unconsolidated entities		$ 58			58
STACK Pipeline LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity		50.00%
Investments in unconsolidated entities		$ 116			120
White Cliffs Pipeline, LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity		36.00%
Investments in unconsolidated entities		$ 196			$ 190
Wink to Webster Pipeline LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity		16.00%		20.00%
Investments in unconsolidated entities		$ 79
Undivided joint interest in Capline pipeline system
Investments in Unconsolidated Entities
Undivided joint interest ownership percentage	54.00%
Carrying value of undivided joint interest	$ 175
Gain on investment in unconsolidated entities | Capline Pipeline Company LLC
Investments in Unconsolidated Entities
Gain from remeasurement to fair value of retained investment		$ 269
Forecast | Red Oak Pipeline LLC
Investments in Unconsolidated Entities
Future increase in investment from contribution			$ 155
Midland, Texas To Webster, Texas pipeline segment | Third Party | Undivided joint interest in pipeline segment
Investments in Unconsolidated Entities
Undivided joint interest ownership percentage		29.00%
Midland, Texas To Webster, Texas pipeline segment | Wink to Webster Pipeline LLC | Undivided joint interest in pipeline segment
Investments in Unconsolidated Entities
Undivided joint interest ownership percentage		71.00%
Sunrise II Pipeline | Forecast | Red Oak Pipeline LLC
Investments in Unconsolidated Entities
Pipeline capacity to be contributed (in bbls) | bbl			260,000
Term of contract			33 years
Capline pipeline system | Capline Pipeline Company LLC
Investments in Unconsolidated Entities
Percentage of Capline pipeline system owned	100.00%

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