Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total revenue	$ 3,099	$ 2,802	$ 6,119	$ 5,533
Income before income taxes	645	619	1,286	1,100
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	963	1,037	1,991	2,101
Interest expense	997	769	1,909	1,498
Provision for credit losses	92	99	211	251
Net finance receivables and net investment in operating leases	143,207	134,993	143,207	134,993
Total assets	159,611	150,494	159,611	150,494	$ 160,443
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenue	3,099	2,802	6,119	5,533
Income before income taxes	678	557	1,350	1,020
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	963	1,037	1,991	2,101
Interest expense	996	769	1,911	1,498
Provision for credit losses	92	99	211	251
Net finance receivables and net investment in operating leases	151,453	142,200	151,453	142,200
Total assets	159,611	150,494	159,611	150,494
Operating Segments [Member] | Americas [Member]
Segment Reporting Information [Line Items]
Total revenue	2,661	2,461	5,241	4,866
Income before income taxes	548	465	1,063	823
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	960	1,027	1,983	2,080
Interest expense	830	643	1,582	1,260
Provision for credit losses	84	86	195	230
Net finance receivables and net investment in operating leases	119,611	115,033	119,611	115,033
Total assets	125,436	120,704	125,436	120,704
Operating Segments [Member] | Europe [Member]
Segment Reporting Information [Line Items]
Total revenue	298	233	594	461
Income before income taxes	103	74	214	151
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	3	10	8	21
Interest expense	76	62	148	123
Provision for credit losses	8	8	13	14
Net finance receivables and net investment in operating leases	25,437	21,740	25,437	21,740
Total assets	27,391	23,819	27,391	23,819
Operating Segments [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Total revenue	140	108	284	206
Income before income taxes	27	18	73	46
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	0	0	0	0
Interest expense	90	64	181	115
Provision for credit losses	0	5	3	7
Net finance receivables and net investment in operating leases	6,405	5,427	6,405	5,427
Total assets	6,784	5,971	6,784	5,971
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Total revenue	0	0	0	0
Income before income taxes	(33)	62	(64)	80
Other disclosures [Abstract]
Depreciation on vehicles subject to operating leases	0	0	0	0
Interest expense	1	0	(2)	0
Provision for credit losses	0	0	0	0
Net finance receivables and net investment in operating leases	(8,246)	(7,207)	(8,246)	(7,207)
Total assets	$ 0	$ 0	$ 0	$ 0