Accrued Expenses and Other Current Liabilities (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Summary of Accrued expenses and other current liabilities
Accrued commissions and incentives	$ 255	$ 213
Accrued interest expense	58	59
Accrued payroll and related	54	54
Accrued sponsor monitoring fees	33	37
Deferred revenue	31	16
Derivative contracts	29	37
Income tax payable	30	19
Other	33	50
Accrued expenses and other current liabilities	$ 523	$ 485