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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Schedule Of Income Tax [Line Items]
Effective tax rate	24.10%	1.80%
U.S. federal corporate tax rate	21.00%		35.00%
Tax cuts and jobs act of 2017, Adjustments of provisional income tax expense	$ 9
Charge relating to change in U.S. federal corporate tax rate	69
Change in valuation allowance	(69)
Charge relating to one-time transition tax on unremitted foreign earnings	33
Net operating loss deferred tax asset, additional charge	9
Global intangible low taxed income provisions and recognized provisional tax expense	1
Valuation Allowance,Net Operating Loss [Member]
Schedule Of Income Tax [Line Items]
Change in valuation allowance	$ (9)

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to revisions of previously reported income tax expense.

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