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Acquisitions and Divestitures - Divestitures (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended	12 Months Ended
	Feb. 29, 2020	Sep. 30, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Divestitures
Proceeds from sales of assets			$ 429	$ 77	$ 1,334
Gains/(losses) on asset sales and asset impairments, net			(719)	(28)	114
(Gains)/losses on asset sales and asset impairments, net
Divestitures
Gains/(losses) on asset sales and asset impairments, net			178
Disposed of by sale
Divestitures
Proceeds from sales of assets				77
Proceeds from sale, including proceeds attributable to agreements entered into in conjunction with sale of productive assets			451
Disposed of by sale | (Gains)/losses on asset sales and asset impairments, net
Divestitures
Recognized gains/(losses) related to sale of assets, net				16	120
Recognized gains related to sale of assets				31	146
Recognized losses related to sales of assets				$ 47	$ 26
Los Angeles Basin Crude Oil Terminals | Disposed of by sale | Facilities
Divestitures
Proceeds from sales of assets			200
NGL Terminals | Disposed of by sale
Divestitures
Proceeds attributable to multi-year supply agreement entered into in conjunction with sale of assets			22
NGL Terminals | Disposed of by sale | Facilities
Divestitures
Proceeds from sale, including proceeds attributable to agreements entered into in conjunction with sale of productive assets			$ 163
Saddlehorn
Divestitures
Ownership percentage sold	10.00%		10.00%
Proceeds from sale of equity method investments	$ 78		$ 78
BridgeTex Pipeline Company, LLC (“BridgeTex”)
Divestitures
Ownership percentage sold		30.00%			30.00%
Proceeds from sale of equity method investments		$ 868			$ 868
Gain on sale of investment in unconsolidated entities		$ 200			$ 200

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