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Investments in Unconsolidated Entities (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended
	Feb. 29, 2020	Jun. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Investments in Unconsolidated Entities
Investments in unconsolidated entities		$ 3,781	$ 3,781	$ 3,683
BridgeTex Pipeline Company, LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity		20.00%	20.00%
Investments in unconsolidated entities		$ 424	$ 424	431
Cactus II Pipeline LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity		65.00%	65.00%
Investments in unconsolidated entities		$ 789	$ 789	738
Capline Pipeline Company LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity		54.00%	54.00%
Investments in unconsolidated entities		$ 503	$ 503	484
Diamond Pipeline LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity		50.00%	50.00%
Investments in unconsolidated entities		$ 479	$ 479	476
Eagle Ford Pipeline LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity		50.00%	50.00%
Investments in unconsolidated entities		$ 375	$ 375	382
Eagle Ford Terminals Corpus Christi LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity		50.00%	50.00%
Investments in unconsolidated entities		$ 122	$ 122	126
Red Oak Pipeline LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity		50.00%	50.00%
Investments in unconsolidated entities		$ 35	$ 35	20
Saddlehorn Pipeline Company, LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity	30.00%	30.00%	30.00%
Investments in unconsolidated entities		$ 198	$ 198	234
Ownership percentage sold	10.00%
Proceeds from sale of interest in unconsolidated entity	$ 78
STACK Pipeline LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity		50.00%	50.00%
Investments in unconsolidated entities		$ 114	$ 114	117
White Cliffs Pipeline, LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity		36.00%	36.00%
Investments in unconsolidated entities		$ 197	$ 197	196
Wink to Webster Pipeline LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity		16.00%	16.00%
Investments in unconsolidated entities		$ 242	$ 242	136
Other investments
Investments in Unconsolidated Entities
Investments in unconsolidated entities		303	303	$ 343
Gain on/(impairment of) investments in unconsolidated entities, net
Investments in Unconsolidated Entities
Write down of investments		$ 69	$ 112
Gain on/(impairment of) investments in unconsolidated entities, net | Saddlehorn Pipeline Company, LLC
Investments in Unconsolidated Entities
Gain on sale of investment in unconsolidated entity	$ 21

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