Income Taxes - Deferred income tax assets and liabilities related to vehicle programs (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Deferred income tax assets:
Other	$ 100	$ 110
Deferred income tax assets	2,358	1,974
Deferred income tax liabilities:
Other	4	14
Deferred income tax liabilities under vehicle programs, net	743	776
Vehicle Programs
Deferred income tax assets:
Depreciation and amortization	80	62
Deferred income tax liabilities:
Depreciation and amortization	2,321	1,445
Other assets
Deferred income tax assets:
Other	19	27
Assets
Deferred income tax assets:
Deferred income tax assets	99	89
Other
Deferred income tax liabilities:
Other	20	27
Liability
Deferred income tax liabilities:
Deferred income tax liabilities	2,341	1,472
Vehicle Programs, Net
Deferred income tax liabilities:
Deferred income tax liabilities under vehicle programs, net	$ 2,242	$ 1,383