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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (3,882)	$ 9,268	$ 9,615
Other comprehensive income (loss), net of tax (Note 20)
Foreign currency translation adjustments and other	747	(384)	(955)
Defined benefit plans	570	(969)	1,011
Other comprehensive income (loss), net of tax	1,317	(1,353)	56
Comprehensive income (loss)	(2,565)	7,915	9,671
Comprehensive loss attributable to noncontrolling interests	20	218	53
Comprehensive income (loss) attributable to stockholders	$ (2,545)	$ 8,133	$ 9,724

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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