Accrued Expenses and Other Current Liabilities (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Summary of Accrued expenses and other current liabilities
Accrued commissions and incentives	$ 249	$ 213
Customer prepayments	121	16
Accrued payroll and related	69	54
Accrued sponsor monitoring fees	33	37
Accrued interest expense	32	59
Deferred revenue	30	16
Income tax payable	31	19
Derivative contracts	5	37
Other	37	50
Accrued expenses and other current liabilities	$ 607	$ 501