Leases - Maturities of Lease Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Property leases
Operating Leases
Within 1 year	$ 830
Between 1 and 2 years	654
Between 2 and 3 years	543
Between 3 and 4 years	434
Between 4 and 5 years	298
Thereafter	1,248
Total lease payments	4,007
Less: Imputed interest	(713)
Total	3,294	$ 3,112
Buses and support vehicles
Operating Leases
Within 1 year	36
Between 1 and 2 years	5
Between 2 and 3 years	1
Between 3 and 4 years	1
Between 4 and 5 years	0
Thereafter	0
Total lease payments	43
Less: Imputed interest	(1)
Total	42	73
Finance Leases
Within 1 year	79
Between 1 and 2 years	8
Between 2 and 3 years	29
Between 3 and 4 years	0
Between 4 and 5 years	14
Thereafter	0
Total lease payments	130
Less: Imputed interest	0
Total	$ 130	$ 143