Segment Reporting and Geographic Information - Geographic Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 13,419	$ 13,831	$ 14,554
Long-Lived Assets	38,081	40,003	42,281
Leased vehicles, net	37,929	39,819	42,100
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	11,718	12,178	12,672
Long-Lived Assets	34,452	36,773	39,509
Non-US
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	1,701	1,653	1,882
Long-Lived Assets	$ 3,629	$ 3,230	$ 2,772