Leases - Lessee Components of Lease Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Finance lease expense:
Operating lease expense	$ 151	$ 167	$ 138
Operating lease, minimum annual guaranteed rent in excess of concession fees			9
Property leases
Property leases
Operating lease expense	935	860	703
Variable lease expense	343	402	520
Sublease income	(6)	(6)	(5)
Total vehicle lease expense	1,272	1,256	1,218
Finance lease expense:
Total vehicle lease expense	1,272	1,256	1,218
Vehicle leases
Property leases
Total vehicle lease expense	185	201	170
Finance lease expense:
Amortization of ROU assets	27	28	29
Interest on lease liabilities	7	6	3
Total vehicle lease expense	$ 185	$ 201	$ 170