Accounts Payable And Other Current Liabilities (Schedule Of Accounts Payable And Other Current Liabilities) (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Payables and Accruals [Abstract]
Accounts payable	$ 376	$ 309
Accrued sales and use taxes	171	148
Accrued payroll and related	179	198
Public liability and property damage insurance liabilities - current	138	60
Deferred income - current	129	132
Advertising and marketing	88	82
Income taxes payable - current	47	58
Other	473	434
Accounts payable and other current liabilities	$ 1,601	$ 1,421