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Acquisitions and Dispositions - Dispositions and Divestitures (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Dispositions
Proceeds from sales of assets	$ 1,083	$ 654	$ 5
Disposed of by sale | Depreciation and amortization
Dispositions
Recognized gains/(losses) related to sale of assets, net	43	100	$ (2)
Recognized gains related to sale of assets	123	158
Recognized losses related to sale of assets	80	58
Held for sale | Goodwill | Depreciation and amortization
Dispositions
Impairment losses		15
Other current assets | Held for sale
Dispositions
Assets classified as held for sale	$ 80	$ 275
Red River Pipeline
Dispositions
Ownership interest disposed of	40.00%

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