Selected Quarterly Financial Data (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Total revenue	$ 2,782	$ 2,855	$ 2,793	$ 3,032	$ 3,114	$ 3,127	$ 3,188	$ 3,194	$ 11,462	$ 12,623	$ 12,382
Depreciation on vehicles subject to operating leases	(656)	(537)	(990)	(1,052)	(923)	(894)	(894)	(924)	(3,235)	(3,635)	(3,973)
Interest expense	(787)	(792)	(839)	(984)	(1,073)	(1,081)	(1,114)	(1,121)	(3,402)	(4,389)	(3,930)
Total financing margin and other revenue	1,339	1,526	964	996	1,118	1,152	1,180	1,149	4,825	4,599	4,479
Provision for credit losses	63	86	93	586	107	93	63	33	828	296	426
Net income	$ 637	$ 859	$ 407	21	$ 441	$ 571	$ 613	$ 603	$ 1,924	$ 2,228	$ 2,224
Provision for Other Credit Losses				$ 486