Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Tax [Line Items]
Income tax expense (benefit)	$ 31	$ 30	$ 117	$ 89
Tax adjustment to prior year estimates			9
Net tax benefits related to US taxable income				22
Unrecognized Tax Benefits Resulting in Net Operating Loss Carryforward	10	9	10	9
Europe [Member]
Income Tax [Line Items]
Restructuring Charges	$ 55