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Investments in Unconsolidated Entities Investments in Unconsolidated Entities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Investments in Unconsolidated Entities
Investments in unconsolidated entities	$ 3,263	$ 2,702
Carrying value of undivided joint interest	$ 14,889	14,787
Advantage Pipeline Holdings LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity	50.00%
Investments in unconsolidated entities	$ 72	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	$ 531	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	$ 455	0
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	$ 484	479
Eagle Ford Pipeline LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity	50.00%
Investments in unconsolidated entities	$ 396	383
Eagle Ford Terminals Corpus Christi LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity	50.00%
Investments in unconsolidated entities	$ 117	108
Midway Pipeline LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity	50.00%
Investments in unconsolidated entities	$ 77	78
Saddlehorn Pipeline Company, LLC
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity	40.00%
Investments in unconsolidated entities	$ 215	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	$ 191	190
Wink to Webster Pipeline LLC (“W2W Pipeline”)
Investments in Unconsolidated Entities
Ownership interest in unconsolidated entity	20.00%
Investments in unconsolidated entities	$ 7	$ 0
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
Capline pipeline system | Capline Pipeline Company LLC
Investments in Unconsolidated Entities
Percentage of Capline pipeline system owned	100.00%
Gain on investment in unconsolidated entities | Capline Pipeline Company LLC
Investments in Unconsolidated Entities
Gain from remeasurement to fair value of retained investment	$ 267

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