Segment Information (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Total revenue	$ 2,981	$ 2,863	$ 2,802	$ 2,731	$ 2,817	$ 2,796	$ 2,688	$ 2,608	$ 11,377	$ 10,909	$ 9,697
Income before income taxes									2,310	1,879	2,086
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	1,045	989	1,037	1,064	1,155	1,085	1,075	1,014	4,135	4,329	3,640
Interest expense	867	810	769	729	725	697	687	646	3,175	2,755	2,416
Provision for credit losses	168	$ 169	$ 99	$ 152	144	$ 138	$ 137	$ 128	588	547	347
Net finance receivables and net investment in operating leases	142,664				130,190				142,664	130,190	121,902
Total assets	160,443				146,089				160,443	146,089	137,448
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenue									11,377	10,840	9,698
Income before income taxes									2,209	1,810	2,087
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases									4,135	4,329	3,640
Interest expense									3,175	2,755	2,416
Provision for credit losses									588	547	347
Net finance receivables and net investment in operating leases	150,501				136,865				150,501	136,865	127,232
Total assets	160,443				146,089				160,443	146,089	137,448
Operating Segments [Member] | Americas [Member]
Segment Reporting Information [Line Items]
Total revenue									9,928	9,505	8,386
Income before income taxes									1,795	1,511	1,763
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases									4,091	4,291	3,603
Interest expense									2,641	2,301	1,931
Provision for credit losses									542	494	309
Net finance receivables and net investment in operating leases	118,392				113,335				118,392	113,335	104,497
Total assets	124,645				119,012				124,645	119,012	111,147
Operating Segments [Member] | Europe [Member]
Segment Reporting Information [Line Items]
Total revenue									981	984	982
Income before income taxes									329	238	297
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases									44	38	37
Interest expense									257	278	294
Provision for credit losses									28	29	16
Net finance receivables and net investment in operating leases	24,957				18,846				24,957	18,846	18,947
Total assets	28,204				21,755				28,204	21,755	22,085
Operating Segments [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Total revenue									468	351	330
Income before income taxes									85	61	27
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases									0	0	0
Interest expense									277	176	191
Provision for credit losses									18	24	22
Net finance receivables and net investment in operating leases	7,152				4,684				7,152	4,684	3,788
Total assets	7,594				5,322				7,594	5,322	4,216
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Total revenue									0	69	(1)
Income before income taxes									101	69	(1)
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases									0	0	0
Interest expense									0	0	0
Provision for credit losses									0	0	0
Net finance receivables and net investment in operating leases	(7,837)				(6,675)				(7,837)	(6,675)	(5,330)
Total assets	$ 0				$ 0				$ 0	$ 0	$ 0