Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Total revenue	$ 2,473	$ 2,855	$ 7,831	$ 8,680
Income before income taxes	1,077	1,123	3,662	1,696
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	441	537	1,200	2,579
Interest expense	668	792	2,152	2,615
Provision for credit losses	(59)	86	(265)	765
Net finance receivables and net investment in operating leases	116,463	131,481	116,463	131,481
Total assets	136,068	153,574	136,068	153,574	$ 158,129
Reportable segments
Segment Reporting Information [Line Items]
Total revenue	2,473	2,855	7,831	8,680
Income before income taxes	1,078	1,019	3,694	1,592
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	441	537	1,200	2,579
Interest expense	685	802	2,182	2,665
Provision for credit losses	(59)	86	(265)	765
Net finance receivables and net investment in operating leases	122,813	140,618	122,813	140,618
Total assets	136,068	153,574	136,068	153,574
Reportable segments | United States and Canada
Segment Reporting Information [Line Items]
Total revenue	2,129	2,510	6,808	7,589
Income before income taxes	978	932	3,440	1,399
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	439	549	1,185	2,578
Interest expense	566	666	1,804	2,237
Provision for credit losses	(67)	79	(284)	675
Net finance receivables and net investment in operating leases	98,555	114,266	98,555	114,266
Total assets	108,917	122,995	108,917	122,995
Reportable segments | Europe
Segment Reporting Information [Line Items]
Total revenue	208	245	687	770
Income before income taxes	55	73	202	155
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	2	(12)	15	1
Interest expense	64	87	216	259
Provision for credit losses	1	1	(6)	68
Net finance receivables and net investment in operating leases	18,943	22,023	18,943	22,023
Total assets	21,163	25,720	21,163	25,720
Reportable segments | All Other
Segment Reporting Information [Line Items]
Total revenue	136	100	336	321
Income before income taxes	45	14	52	38
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	0	0	0	0
Interest expense	55	49	162	169
Provision for credit losses	7	6	25	22
Net finance receivables and net investment in operating leases	5,315	4,329	5,315	4,329
Total assets	5,988	4,859	5,988	4,859
Unallocated other
Segment Reporting Information [Line Items]
Total revenue	0	0	0	0
Income before income taxes	(1)	104	(32)	104
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	0	0	0	0
Interest expense	(17)	(10)	(30)	(50)
Provision for credit losses	0	0	0	0
Net finance receivables and net investment in operating leases	(6,350)	(9,137)	(6,350)	(9,137)
Total assets	$ 0	$ 0	$ 0	$ 0