Accounts Payable and Other Current Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Accounts Payable and Other Current Liabilities [Abstract]
Short-term operating lease liabilities	$ 420	$ 0
Accounts payable	382	371
Accrued sales and use taxes	267	208
Accrued advertising and marketing	206	192
Accrued payroll and related	184	200
Public liability and property damage insurance liabilities – current	150	149
Deferred lease revenues – current	141	140
Other	445	433
Accounts payable and other current liabilities	$ 2,195	$ 1,693