Accrued Expenses and Other Current Liabilities - Summary of Accrued Expenses and Other Current Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Payables And Accruals [Abstract]
Accrued commissions and incentives	$ 266	$ 211
Accrued interest expense	86	61
Accrued payroll and related	72	71
Customer prepayments	71	56
Deferred revenue	30	29
Accrued sponsor monitoring fees	26	32
Income tax payable	24	24
Pension and post-retirement benefit liabilities	2	2
Derivative contracts	1	4
Other	18	47
Accrued expenses and other current liabilities	$ 596	$ 537