Segment Information (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total revenue	$ 3,114	$ 3,127	$ 3,188	$ 3,194	$ 3,182	$ 3,081	$ 3,099	$ 3,020	$ 12,623	$ 12,382	$ 11,377
Income before income taxes									2,998	2,627	2,310
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	923	894	894	924	998	936	986	1,053	3,635	3,973	4,254
Interest expense	1,073	1,081	1,114	1,121	1,032	989	997	912	4,389	3,930	3,175
Provision for credit losses	107	$ 93	$ 63	$ 33	136	$ 127	$ 69	$ 94	296	426	469
Net finance receivables and net investment in operating leases	141,976				146,263				141,976	146,263	142,664
Total assets	161,426				162,209				161,426	162,209	160,443
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenue									12,623	12,382	11,377
Income before income taxes									2,860	2,701	2,209
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases									3,635	3,973	4,254
Interest expense									4,371	3,936	3,175
Provision for credit losses									296	426	469
Net finance receivables and net investment in operating leases	150,190				154,876				150,190	154,876	150,501
Total assets	161,426				162,209				161,426	162,209	160,443
Operating Segments [Member] | Americas [Member]
Segment Reporting Information [Line Items]
Total revenue									11,109	10,706	9,928
Income before income taxes									2,422	2,208	1,795
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases									3,592	3,934	4,210
Interest expense									3,840	3,331	2,641
Provision for credit losses									277	391	423
Net finance receivables and net investment in operating leases	120,976				123,403				120,976	123,403	118,392
Total assets	127,533				128,498				127,533	128,498	124,645
Operating Segments [Member] | Europe [Member]
Segment Reporting Information [Line Items]
Total revenue									1,183	1,160	981
Income before income taxes									363	391	329
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases									43	39	44
Interest expense									340	283	257
Provision for credit losses									25	20	28
Net finance receivables and net investment in operating leases	25,629				26,029				25,629	26,029	24,957
Total assets	30,050				27,804				30,050	27,804	28,204
Operating Segments [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Total revenue									331	516	468
Income before income taxes									75	102	85
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases									0	0	0
Interest expense									191	322	277
Provision for credit losses									(6)	15	18
Net finance receivables and net investment in operating leases	3,585				5,444				3,585	5,444	7,152
Total assets	3,843				5,907				3,843	5,907	7,594
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Total revenue									0	0	0
Income before income taxes									138	(74)	101
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases									0	0	0
Interest expense									18	(6)	0
Provision for credit losses									0	0	0
Net finance receivables and net investment in operating leases	(8,214)				(8,613)				(8,214)	(8,613)	(7,837)
Total assets	$ 0				$ 0				$ 0	$ 0	$ 0