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Income Taxes - Domestic and Foreign Components of Income (Loss) Before Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income before income taxes, Domestic	$ (470)	$ (2,095)	$ (1,577)
Income before income taxes, Foreign	78	(528)	988
Income before income taxes	$ (392)	$ (2,623)	$ (589)