Accrued Expenses and Other Current Liabilities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Accrued Expenses And Other Current Liabilities [Line Items]
Accrued commissions and incentives	$ 266	$ 211
Customer Loyalty Payments [Member]
Accrued Expenses And Other Current Liabilities [Line Items]
Accrued commissions and incentives	$ 22	$ 15