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Income Taxes - Domestic and Foreign Components of Income Before Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Income before income taxes, Domestic	$ (1,577)	$ 1,415	$ 1,362
Income before income taxes, Foreign	988	2,079	1,762
Income before income taxes	$ (589)	$ 3,494	$ 3,124