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Summary of Significant Accounting Policies (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($)
Accounting Standards Update 2016-16 [Member] \| Restatement Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative adjustment to retained earnings	$ 31
Accounting Standards Update 2016-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Share-based compensation excess tax deficiency	$ 15

Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

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