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 income tax rate	28.30%	32.40%	30.50%	32.40%
Valuation Allowance [Line Items]
Unrecognized tax benefits	$ 32		$ 32
Unrecognized tax benefits, current period change			8
Unrecognized tax benefits, increase resulting from current period tax positions			4
Unrecognized tax benefits, increase resulting from a tax position in a foreign jurisdiction			4
Unrecognized tax benefits that, if recognized, would impact the effective tax rate	22		22
Net cash payments for income taxes, net of refunds			$ 128	$ 90
Tax Positions Taken in a Foreign Jurisdiction
Valuation Allowance [Line Items]
Reserve established	$ 5