Leases - Lessee Components of Lease Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Finance lease expense:
Operating lease expense	$ 120	$ 151	$ 167
Property leases
Property leases
Operating lease expense	957	935	860
Variable lease expense	338	343	402
Sublease income	(6)	(6)	(6)
Total vehicle lease expense	1,289	1,272	1,256
Finance lease expense:
Total vehicle lease expense	1,289	1,272	1,256
Vehicle leases
Property leases
Total vehicle lease expense	144	185	201
Finance lease expense:
Amortization of right-of-use assets	18	27	28
Interest on lease liabilities	6	7	6
Total vehicle lease expense	$ 144	$ 185	$ 201