Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Income Taxes [Line Items]
Unrecognized tax benefits		$ 7
Impact of unrecognized tax benefits if recognized		4
Accrued interest and penalties	2
Jurisdictions statutes of limitations expiration period	12 months
Period of expiration of the statute of limitations for certain jurisdictions	Within the next twelve months
Change in estimated liabilities for uncertain tax positions	$ (3)
Minimum
Income Taxes [Line Items]
Foreign and U.S. state and local jurisdictions have statutes of limitations, in years	3
Maximum
Income Taxes [Line Items]
Foreign and U.S. state and local jurisdictions have statutes of limitations, in years	4