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Income Taxes - Additional information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Tax Disclosure [Abstract]
Effective tax rate	0.00%	(2.20%)
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
Income tax expense	$ 0	1
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	$ 2	$ 45

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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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