Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Goodwill (Details) - USD ($) $ in Millions	5 Months Ended	12 Months Ended
Goodwill (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jul. 20, 2015
Goodwill [Line Items]
Goodwill	$ 0	$ 0	$ 620	$ 627
Goodwill Impairment		779	0	0
US Onshore Assets Sold
Goodwill [Line Items]
Goodwill	163	163
Goodwill, Written off Related to Sale of Business Unit		$ 4	$ 7	$ 8
Rosetta Resources, Inc
Goodwill [Line Items]
Goodwill					$ 163
Goodwill Impairment	$ 163