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Acquisitions and Divestitures - Dispositions and Divestitures (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Divestitures
Proceeds from sales of assets		$ 1,334	$ 1,083	$ 654
Gain on sale of investment in unconsolidated entities		200	0	0
Disposed of by sale | (Gains)/losses on asset sales and asset impairments, net
Divestitures
Recognized gains/(losses) related to sale of assets, net		120	43	100
Recognized gains related to sale of assets		146	123	158
Recognized losses related to sale of assets		$ 26	80	58
Held for sale | Goodwill | (Gains)/losses on asset sales and asset impairments, net
Divestitures
Impairment losses				$ 15
Other current assets | Held for sale
Divestitures
Assets classified as held for sale			$ 80
Red River Pipeline
Divestitures
Ownership interest disposed of			40.00%
BridgeTex Pipeline Company, LLC (“BridgeTex”)
Divestitures
Ownership percentage sold	30.00%	30.00%
Proceeds from sale of equity investments	$ 868
Gain on sale of investment in unconsolidated entities		$ 200

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