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Income Taxes - Additional information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Tax Disclosure [Abstract]
Effective tax rate	24.70%	(6.40%)	55.00%	(11.00%)
Impairment of goodwill, acquired intangibles and other assets		$ 340	$ 76	$ 340
Non-deductible goodwill		318	57	318
Impairment of intangible assets, indefinite-lived (excluding goodwill)		22	19	22
Deferred income taxes		$ 8	$ 6	$ 8

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- Definition

Deferred Income Tax Expense (Benefit), Intangible

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- Definition

Impairment of Intangible Assets, Indefinite-lived (Including Goodwill)

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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