Segment Information (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total revenue	$ 3,182	$ 3,081	$ 3,099	$ 3,020	$ 2,981	$ 2,863	$ 2,802	$ 2,731	$ 12,382	$ 11,377	$ 10,909
Income before income taxes									2,627	2,310	1,879
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	969	907	963	1,028	1,045	989	1,037	1,064	3,867	4,135	4,329
Interest expense	1,032	989	997	912	867	810	769	729	3,930	3,175	2,755
Provision for credit losses	165	$ 156	$ 92	$ 119	168	$ 169	$ 99	$ 152	532	588	547
Net finance receivables and net investment in operating leases	146,263				142,664				146,263	142,664	130,190
Total assets	162,209				160,443				162,209	160,443	146,089
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenue									12,382	11,377	10,840
Income before income taxes									2,701	2,209	1,810
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases									3,867	4,135	4,329
Interest expense									3,936	3,175	2,755
Provision for credit losses									532	588	547
Net finance receivables and net investment in operating leases	154,876				150,501				154,876	150,501	136,865
Total assets	162,209				160,443				162,209	160,443	146,089
Operating Segments [Member] | Americas [Member]
Segment Reporting Information [Line Items]
Total revenue									10,706	9,928	9,505
Income before income taxes									2,208	1,795	1,511
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases									3,828	4,091	4,291
Interest expense									3,331	2,641	2,301
Provision for credit losses									497	542	494
Net finance receivables and net investment in operating leases	123,403				118,392				123,403	118,392	113,335
Total assets	128,498				124,645				128,498	124,645	119,012
Operating Segments [Member] | Europe [Member]
Segment Reporting Information [Line Items]
Total revenue									1,160	981	984
Income before income taxes									391	329	238
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases									39	44	38
Interest expense									283	257	278
Provision for credit losses									20	28	29
Net finance receivables and net investment in operating leases	26,029				24,957				26,029	24,957	18,846
Total assets	27,804				28,204				27,804	28,204	21,755
Operating Segments [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Total revenue									516	468	351
Income before income taxes									102	85	61
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases									0	0	0
Interest expense									322	277	176
Provision for credit losses									15	18	24
Net finance receivables and net investment in operating leases	5,444				7,152				5,444	7,152	4,684
Total assets	5,907				7,594				5,907	7,594	5,322
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Total revenue									0	0	69
Income before income taxes									(74)	101	69
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases									0	0	0
Interest expense									(6)	0	0
Provision for credit losses									0	0	0
Net finance receivables and net investment in operating leases	(8,613)				(7,837)				(8,613)	(7,837)	(6,675)
Total assets	$ 0				$ 0				$ 0	$ 0	$ 0