Acquisitions and Divestitures (Assets and Liabilities Held for Sale) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Composition of assets included in assets held for sale:
Total assets	$ 20	$ 0
Composition of liabilities included in liabilities held for sale:
Total liabilities	6	$ 0
West Eagle Ford Shale
Composition of assets included in assets held for sale:
Current assets	19
Goodwill	1
Total assets	20
Composition of liabilities included in liabilities held for sale:
Other liabilities	6
Total liabilities	$ 6

Amount classified as assets attributable to disposal group held for sale or disposed of.

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