Schedule of Accounts Payable and Other Current Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Payables and Accruals [Abstract]
Accounts payable	$ 343	$ 352
Accrued sales and use taxes	206	220
Accrued payroll and related	173	199
Public liability and property damage insurance liabilities – current	141	131
Deferred revenue – current	114	103
Other	511	480
Accounts payable and other current liabilities	$ 1,488	$ 1,485