Leases - Lessee Components of Lease Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Finance lease expense:
Operating lease expense	$ 167	$ 138	$ 156
Operating lease, minimum annual guaranteed rent in excess of concession fees		(9)	(2)
Property leases
Property leases
Operating lease expense	860	703	561
Variable lease expense	402	520	433
Sublease income	(6)	(5)	(6)
Total vehicle lease expense	1,256	1,218	988
Finance lease expense:
Total vehicle lease expense	1,256	1,218	988
Vehicle leases
Property leases
Total vehicle lease expense	201	170	197
Finance lease expense:
Amortization of ROU assets	28	29	37
Interest on lease liabilities	6	3	4
Total vehicle lease expense	$ 201	$ 170	$ 197