Accounts Payable, Accrued Expenses and Other (Details) - USD ($) $ in Millions		Dec. 31, 2020	Dec. 31, 2019
Payables and Accruals [Abstract]
Accrued employee compensation and benefits		$ 404	$ 554
Accounts payable		224	303
Insurance reserves, current		68	95
Other liabilities and accrued expenses	[1]	436	618
Accounts payable, accrued expenses and other		1,302	1,703
Accounts payable, accrued expenses and other
Payables and Accruals [Abstract]
Operating lease liabilities, current		170	133
Operating lease liabilities, current		$ 170	$ 133

[1] Includes deposit liabilities related to hotel operations and application fees, promotional liabilities and income taxes payable, as well as accrued expenses related to taxes, interest and other.