Accrued Expenses and Other Current Liabilities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Accrued Expenses And Other Current Liabilities [Line Items]
Accrued commissions and incentives	$ 298	$ 253
Customer Loyalty Payments [Member]
Accrued Expenses And Other Current Liabilities [Line Items]
Accrued commissions and incentives	$ 62	$ 35