Guarantor Condensed Consolidating Financial Statements Current Period Guarantor Balance Sheet (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	$ 2,898	$ 3,061	$ 2,121	$ 2,974
Finance receivables, net	38,658	36,781
Leased vehicles, net	24,538	20,172
Restricted cash	2,130	1,941
Goodwill	1,195	1,189
Equity in net assets of non-consolidated affiliates	989	986
Property and equipment, net	230	219
Deferred income taxes	251	231
Related party receivables	1,076	573
Other assets	799	751
Due from affiliates	0	0
Investment in affiliates	0	0
Total assets	72,764	65,904
Secured debt	32,733	30,689
Unsecured debt	27,638	23,657
Accounts payable and accrued expenses	1,236	1,218
Deferred income	1,783	1,454
Deferred income taxes	161	129
Related party payables	448	362
Other liabilities	390	343
Due to affiliates	0	0
Total liabilities	64,389	57,852
Common stock	0	0
Additional paid-in capital	6,491	6,484
Accumulated other comprehensive loss	(952)	(1,104)	(779)
Retained earnings	2,836	2,672
Total shareholder's equity	8,375	8,052
Total liabilities and shareholder's equity	72,764	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, net	0	0
Restricted cash	0	0
Goodwill	1,095	1,095
Equity in net assets of non-consolidated affiliates	0	0
Property and equipment, net	0	0
Deferred income taxes	268	212
Related party receivables	0	0
Other assets	36	32
Due from affiliates	18,162	15,573
Investment in affiliates	8,884	8,476
Total assets	28,445	25,388
Secured debt	0	0
Unsecured debt	19,831	17,087
Accounts payable and accrued expenses	169	181
Deferred income	0	0
Deferred income taxes	0	0
Related party payables	0	0
Other liabilities	70	68
Due to affiliates	0	0
Total liabilities	20,070	17,336
Common stock	0	0
Additional paid-in capital	6,491	6,484
Accumulated other comprehensive loss	(952)	(1,104)
Retained earnings	2,836	2,672
Total shareholder's equity	8,375	8,052
Total liabilities and shareholder's equity	28,445	25,388
Guarantor [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	2,033	2,259	1,444	2,266
Finance receivables, net	6,132	4,808
Leased vehicles, net	0	0
Restricted cash	67	60
Goodwill	0	0
Equity in net assets of non-consolidated affiliates	0	0
Property and equipment, net	105	41
Deferred income taxes	0	0
Related party receivables	26	27
Other assets	160	32
Due from affiliates	8,764	7,556
Investment in affiliates	6,303	6,425
Total assets	23,590	21,208
Secured debt	0	0
Unsecured debt	0	0
Accounts payable and accrued expenses	222	717
Deferred income	0	0
Deferred income taxes	169	289
Related party payables	0	0
Other liabilities	43	34
Due to affiliates	18,107	15,495
Total liabilities	18,541	16,535
Common stock	0	0
Additional paid-in capital	79	79
Accumulated other comprehensive loss	(136)	(175)
Retained earnings	5,106	4,769
Total shareholder's equity	5,049	4,673
Total liabilities and shareholder's equity	23,590	21,208
Non-Guarantors [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	865	802	677	708
Finance receivables, net	32,526	31,973
Leased vehicles, net	24,538	20,172
Restricted cash	2,063	1,881
Goodwill	100	94
Equity in net assets of non-consolidated affiliates	989	986
Property and equipment, net	125	178
Deferred income taxes	246	179
Related party receivables	1,050	546
Other assets	663	687
Due from affiliates	0	0
Investment in affiliates	0	0
Total assets	63,165	57,498
Secured debt	32,793	30,689
Unsecured debt	7,807	6,570
Accounts payable and accrued expenses	845	320
Deferred income	1,783	1,454
Deferred income taxes	255	0
Related party payables	448	362
Other liabilities	277	241
Due to affiliates	8,819	7,634
Total liabilities	53,027	47,270
Common stock	698	698
Additional paid-in capital	6,149	6,490
Accumulated other comprehensive loss	(936)	(1,095)
Retained earnings	4,227	4,135
Total shareholder's equity	10,138	10,228
Total liabilities and shareholder's equity	63,165	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, net	0	0
Restricted cash	0	0
Goodwill	0	0
Equity in net assets of non-consolidated affiliates	0	0
Property and equipment, net	0	0
Deferred income taxes	(263)	(160)
Related party receivables	0	0
Other assets	(60)	0
Due from affiliates	(26,926)	(23,129)
Investment in affiliates	(15,187)	(14,901)
Total assets	(42,436)	(38,190)
Secured debt	(60)	0
Unsecured debt	0	0
Accounts payable and accrued expenses	0	0
Deferred income	0	0
Deferred income taxes	(263)	(160)
Related party payables	0	0
Other liabilities	0	0
Due to affiliates	(26,926)	(23,129)
Total liabilities	(27,249)	(23,289)
Common stock	(698)	(698)
Additional paid-in capital	(6,228)	(6,569)
Accumulated other comprehensive loss	1,072	1,270
Retained earnings	(9,333)	(8,904)
Total shareholder's equity	(15,187)	(14,901)
Total liabilities and shareholder's equity	$ (42,436)	$ (38,190)