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Income Taxes - Components of Provision for Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current:
Federal	$ (79)	$ 30	$ 681
State	(4)	(58)	43
Foreign	74	464	615
Total current income tax provision	(9)	436	1,339
Deferred:
Federal	(132)	(41)	(309)
State	(7)	(38)	(5)
Foreign	(59)	(179)	14
Total deferred income tax benefit	(198)	(258)	(300)
Total income tax provision	$ (207)	$ 178	$ 1,039

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