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Income Taxes - Additional information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Effective tax rate	(116.70%)	45.60%	(600.00%)	48.50%
Other tax expense (benefit)	$ 6		$ 6
Unrecognized tax benefits, period increase (decrease)		$ 22
Impairment of goodwill, acquired intangibles and other assets				$ 76
Non-deductible goodwill				57
Impairment of intangible assets, indefinite-lived (excluding goodwill)				19
Deferred income taxes benefit				$ 6
Unrecognized tax benefits, decrease resulting from prior period tax positions		$ 2

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Deferred Income Tax Expense (Benefit), Intangible

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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