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Investments in Unconsolidated Entities Investments in Unconsolidated Entities (Details) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2021 USD ($) bbl	Mar. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)	Aug. 08, 2019	Dec. 31, 2018 USD ($)
Investments in Unconsolidated Entities
Investments in unconsolidated entities			$ 3,377		$ 2,702
Carrying value of undivided joint interest			$ 15,141		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			$ 434		435
Cactus II Pipeline LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity			65.00%
Investments in unconsolidated entities			$ 602		455
Caddo Pipeline LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity			50.00%
Investments in unconsolidated entities			$ 65		65
Capline Pipeline Company LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity			54.00%
Investments in unconsolidated entities			$ 466
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			$ 43		44
Diamond Pipeline LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity			50.00%
Investments in unconsolidated entities			$ 478		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			$ 120		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			$ 1
Saddlehorn Pipeline Company, LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity			40.00%
Investments in unconsolidated entities			$ 223		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			$ 117		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			20.00%
Investments in unconsolidated entities			$ 38
Undivided joint interest in Capline pipeline system
Investments in Unconsolidated Entities
Undivided joint interest ownership percentage		54.00%
Carrying value of undivided joint interest		$ 177
Gain on investment in unconsolidated entities | Capline Pipeline Company LLC
Investments in Unconsolidated Entities
Gain from remeasurement to fair value of retained investment			$ 267
Subsequent event | Wink to Webster Pipeline LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity				16.00%
Forecast | Red Oak Pipeline LLC
Investments in Unconsolidated Entities
Future increase in investment from contribution	$ 160
Sunrise II Pipeline | Forecast | Red Oak Pipeline LLC
Investments in Unconsolidated Entities
Pipeline capacity to be contributed (in bbls) | bbl	300,000
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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