Accounts Payable and Other Current Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Accounts Payable and Other Current Liabilities [Abstract]
Short-term operating lease liabilities	$ 433	$ 0
Accounts payable	400	371
Deferred lease revenues – current	230	140
Accrued sales and use taxes	228	208
Accrued payroll and related	185	200
Accrued advertising and marketing	180	192
Public liability and property damage insurance liabilities – current	152	149
Other	441	433
Accounts payable and other current liabilities	$ 2,249	$ 1,693