Segment Information (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
Segment Reporting Information [Line Items]
Total revenue	$ 2,782	$ 2,855	$ 2,793	$ 3,032	$ 3,114	$ 3,127	$ 3,188	$ 3,194	$ 11,462	$ 12,623	$ 12,382
Income before income taxes									2,608	2,998	2,627
Other disclosures [Abstract]
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
Provision for credit losses	63	$ 86	$ 93	$ 586	107	$ 93	$ 63	$ 33	828	296	426
Net finance receivables and net investment in operating leases	131,725				141,976				131,725	141,976	146,263
Total assets	159,017				161,426				159,017	161,426	162,209
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenue									11,462	12,623	12,382
Income before income taxes									2,475	2,860	2,701
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases									(3,235)	(3,635)	(3,973)
Interest expense									3,462	4,371	3,936
Provision for credit losses									828	296	426
Net finance receivables and net investment in operating leases	140,503				150,190				140,503	150,190	154,876
Total assets	159,017				161,426				159,017	161,426	162,209
Operating Segments [Member] | Americas [Member]
Segment Reporting Information [Line Items]
Total revenue									10,020	10,795	10,358
Income before income taxes									2,241	2,365	2,132
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases									(3,237)	(3,592)	(3,934)
Interest expense									2,892	3,685	3,183
Provision for credit losses									716	260	361
Net finance receivables and net investment in operating leases	112,208				119,498				112,208	119,498	121,712
Total assets	125,962				125,647				125,962	125,647	126,354
Operating Segments [Member] | Europe [Member]
Segment Reporting Information [Line Items]
Total revenue									1,012	1,183	1,160
Income before income taxes									196	352	382
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases									(2)	(43)	(39)
Interest expense									347	340	283
Provision for credit losses									63	25	20
Net finance receivables and net investment in operating leases	23,517				25,630				23,517	25,630	26,028
Total assets	27,620				30,050				27,620	30,050	27,804
Operating Segments [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Total revenue									430	645	864
Income before income taxes									38	143	187
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases									0	0	0
Interest expense									223	346	470
Provision for credit losses									49	11	45
Net finance receivables and net investment in operating leases	4,778				5,062				4,778	5,062	7,136
Total assets	5,435				5,729				5,435	5,729	8,051
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Total revenue									0	0	0
Income before income taxes									133	138	(74)
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases									0	0	0
Interest expense									(60)	18	(6)
Provision for credit losses									0	0	0
Net finance receivables and net investment in operating leases	(8,778)				(8,214)				(8,778)	(8,214)	(8,613)
Total assets	$ 0				$ 0				$ 0	$ 0	$ 0