Accounts Payable and Other Current Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Accounts Payable and Accrued Liabilities, Current [Abstract]
Short-term operating lease liabilities	$ 484	$ 514
Accounts payable	461	394
Accrued sales and use taxes	313	215
Deferred lease revenues - current	217	70
Accrued advertising and marketing	206	122
Accrued payroll and related	189	117
Public liability and property damage insurance liabilities - current	166	162
Other	444	440
Accounts payable and other current liabilities	$ 2,480	$ 2,034