Leases - Maturities of Lease Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Property
Operating Leases
Within 1 year	$ 646
Between 1 and 2 years	441
Between 2 and 3 years	345
Between 3 and 4 years	286
Between 4 and 5 years	234
Thereafter	967
Total lease payments	2,919
Less: Imputed interest	(480)
Total	2,439	$ 2,406
Buses and support vehicles
Operating Leases
Within 1 year	64
Between 1 and 2 years	18
Between 2 and 3 years	6
Between 3 and 4 years	1
Between 4 and 5 years	0
Thereafter	0
Total lease payments	89
Less: Imputed interest	(3)
Total	86	64
Finance Leases
Within 1 year	44
Between 1 and 2 years	4
Between 2 and 3 years	128
Between 3 and 4 years	0
Between 4 and 5 years	0
Thereafter	0
Total lease payments	176
Less: Imputed interest	0
Total	$ 176	$ 242