Guarantor Condensed Consolidating Financial Statements Current Period Guarantor Balance Sheet (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	$ 3,102	$ 3,061	$ 2,070	$ 2,974
Finance receivables, net	39,430	36,781
Leased vehicles assets	28,442	20,172
Restricted cash (Note 5; Note 8 VIEs)	2,010	1,941
Goodwill	1,200	1,189
Equity in net assets of non-consolidated affiliates (Note 6)	879	986
Property and equipment, net	245	219
Deferred income taxes	307	231
Related party receivables (Note 2)	979	573
Other assets	1,009	751
Due from affiliates	0	0
Investment in affiliates	0	0
Total assets	77,603	65,904
Secured debt (Note 7; Note 8 VIEs)	34,338	30,689
Unsecured debt (Note 7)	30,162	23,657
Accounts payable and accrued expenses	1,537	1,218
Deferred income	2,035	1,454
Deferred income taxes	251	129
Related party payables (Note 2)	449	362
Other liabilities	358	343
Due to affiliates	0	0
Total liabilities	69,130	57,852
Common stock	0	0
Additional paid-in capital	6,486	6,484
Accumulated other comprehensive loss (Note 14)	(1,038)	(1,104)	(674)
Retained earnings	3,025	2,672
Total shareholder's equity	8,473	8,052
Total liabilities and shareholder's equity	77,603	65,904
Parent Company [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	0	0	0	0
Finance receivables, net	0	0
Leased vehicles assets	0	0
Restricted cash (Note 5; Note 8 VIEs)	0	0
Goodwill	1,095	1,095
Equity in net assets of non-consolidated affiliates (Note 6)	0	0
Property and equipment, net	0	0
Deferred income taxes	340	212
Related party receivables (Note 2)	0	0
Other assets	20	32
Due from affiliates	20,087	15,573
Investment in affiliates	9,127	8,476
Total assets	30,669	25,388
Secured debt (Note 7; Note 8 VIEs)	0	0
Unsecured debt (Note 7)	21,887	17,087
Accounts payable and accrued expenses	244	181
Deferred income	0	0
Deferred income taxes	0	0
Related party payables (Note 2)	1	0
Other liabilities	64	68
Due to affiliates	0	0
Total liabilities	22,196	17,336
Common stock	0	0
Additional paid-in capital	6,486	6,484
Accumulated other comprehensive loss (Note 14)	(1,038)	(1,104)
Retained earnings	3,025	2,672
Total shareholder's equity	8,473	8,052
Total liabilities and shareholder's equity	30,669	25,388
Guarantor [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	2,209	2,259	1,161	2,266
Finance receivables, net	6,805	4,808
Leased vehicles assets	0	0
Restricted cash (Note 5; Note 8 VIEs)	14	60
Goodwill	0	0
Equity in net assets of non-consolidated affiliates (Note 6)	0	0
Property and equipment, net	119	41
Deferred income taxes	0	0
Related party receivables (Note 2)	27	27
Other assets	361	32
Due from affiliates	10,514	7,556
Investment in affiliates	6,082	6,425
Total assets	26,131	21,208
Secured debt (Note 7; Note 8 VIEs)	0	0
Unsecured debt (Note 7)	0	0
Accounts payable and accrued expenses	385	717
Deferred income	0	0
Deferred income taxes	392	289
Related party payables (Note 2)	0	0
Other liabilities	15	34
Due to affiliates	20,042	15,495
Total liabilities	20,834	16,535
Common stock	0	0
Additional paid-in capital	79	79
Accumulated other comprehensive loss (Note 14)	(138)	(175)
Retained earnings	5,356	4,769
Total shareholder's equity	5,297	4,673
Total liabilities and shareholder's equity	26,131	21,208
Non-Guarantors [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	893	802	909	708
Finance receivables, net	32,625	31,973
Leased vehicles assets	28,442	20,172
Restricted cash (Note 5; Note 8 VIEs)	1,996	1,881
Goodwill	105	94
Equity in net assets of non-consolidated affiliates (Note 6)	879	986
Property and equipment, net	126	178
Deferred income taxes	264	179
Related party receivables (Note 2)	952	546
Other assets	767	687
Due from affiliates	0	0
Investment in affiliates	0	0
Total assets	67,049	57,498
Secured debt (Note 7; Note 8 VIEs)	34,477	30,689
Unsecured debt (Note 7)	8,275	6,570
Accounts payable and accrued expenses	908	320
Deferred income	2,035	1,454
Deferred income taxes	156	0
Related party payables (Note 2)	448	362
Other liabilities	279	241
Due to affiliates	10,559	7,634
Total liabilities	57,137	47,270
Common stock	698	698
Additional paid-in capital	5,754	6,490
Accumulated other comprehensive loss (Note 14)	(1,022)	(1,095)
Retained earnings	4,482	4,135
Total shareholder's equity	9,912	10,228
Total liabilities and shareholder's equity	67,049	57,498
Eliminations [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	0	0	$ 0	$ 0
Finance receivables, net	0	0
Leased vehicles assets	0	0
Restricted cash (Note 5; Note 8 VIEs)	0	0
Goodwill	0	0
Equity in net assets of non-consolidated affiliates (Note 6)	0	0
Property and equipment, net	0	0
Deferred income taxes	(297)	(160)
Related party receivables (Note 2)	0	0
Other assets	(139)	0
Due from affiliates	(30,601)	(23,129)
Investment in affiliates	(15,209)	(14,901)
Total assets	(46,246)	(38,190)
Secured debt (Note 7; Note 8 VIEs)	(139)	0
Unsecured debt (Note 7)	0	0
Accounts payable and accrued expenses	0	0
Deferred income	0	0
Deferred income taxes	(297)	(160)
Related party payables (Note 2)	0	0
Other liabilities	0	0
Due to affiliates	(30,601)	(23,129)
Total liabilities	(31,037)	(23,289)
Common stock	(698)	(698)
Additional paid-in capital	(5,833)	(6,569)
Accumulated other comprehensive loss (Note 14)	1,160	1,270
Retained earnings	(9,838)	(8,904)
Total shareholder's equity	(15,209)	(14,901)
Total liabilities and shareholder's equity	$ (46,246)	$ (38,190)