Accounts Payable and Other Current Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Accounts Payable and Other Current Liabilities [Abstract]
Accounts payable	$ 355	$ 343
Accrued sales and use taxes	229	206
Accrued payroll and related	147	173
Public liability and property damage insurance liabilities – current	143	141
Deferred revenue – current	164	114
Other	551	511
Accounts payable and other current liabilities	$ 1,589	$ 1,488