Guarantor Condensed Consolidating Financial Statements - Current Period Guarantor Balance Sheet (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	$ 2,588	$ 3,061	$ 1,602	$ 2,974
Finance receivables, net	41,132	36,781
Leased vehicles, net	31,775	20,172
Restricted cash (Note 5; Note 8 VIEs)	2,055	1,941
Goodwill	1,198	1,189
Equity in net assets of non-consolidated affiliates (Note 6)	940	986
Property and equipment, net	253	219
Deferred income taxes	310	231
Related party receivables (Note 2)	850	573
Other assets	1,010	751
Due from affiliates	0	0
Investment in affiliates	0	0
Total assets	82,111	65,904
Secured debt (Note 7; Note 8 VIEs)	35,237	30,689
Unsecured debt (Note 7)	33,526	23,657
Accounts payable and accrued expenses	1,419	1,218
Deferred income	2,226	1,454
Deferred income taxes	299	129
Related party payables (Note 2)	407	362
Other liabilities	379	343
Due to affiliates	0	0
Total liabilities	73,493	57,852
Common stock	0	0
Additional paid-in capital	6,495	6,484
Accumulated other comprehensive loss (Note 13)	(1,049)	(1,104)	(956)
Retained earnings	3,172	2,672
Total shareholder's equity	8,618	8,052
Total liabilities and shareholder's equity	82,111	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 (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	422	212
Related party receivables (Note 2)	0	0
Other assets	18	32
Due from affiliates	23,089	15,573
Investment in affiliates	9,357	8,476
Total assets	33,981	25,388
Secured debt (Note 7; Note 8 VIEs)	0	0
Unsecured debt (Note 7)	25,085	17,087
Accounts payable and accrued expenses	201	181
Deferred income	0	0
Deferred income taxes	0	0
Related party payables (Note 2)	0	0
Other liabilities	77	68
Due to affiliates	0	0
Total liabilities	25,363	17,336
Common stock	0	0
Additional paid-in capital	6,495	6,484
Accumulated other comprehensive loss (Note 13)	(1,049)	(1,104)
Retained earnings	3,172	2,672
Total shareholder's equity	8,618	8,052
Total liabilities and shareholder's equity	33,981	25,388
Guarantor [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	1,692	2,259	834	2,266
Finance receivables, net	7,932	4,808
Leased vehicles, net	0	0
Restricted cash (Note 5; Note 8 VIEs)	19	60
Goodwill	0	0
Equity in net assets of non-consolidated affiliates (Note 6)	0	0
Property and equipment, net	127	41
Deferred income taxes	0	0
Related party receivables (Note 2)	53	27
Other assets	311	32
Due from affiliates	14,177	7,556
Investment in affiliates	4,539	6,425
Total assets	28,850	21,208
Secured debt (Note 7; Note 8 VIEs)	0	0
Unsecured debt (Note 7)	0	0
Accounts payable and accrued expenses	289	717
Deferred income	0	0
Deferred income taxes	15	289
Related party payables (Note 2)	0	0
Other liabilities	38	34
Due to affiliates	23,027	15,495
Total liabilities	23,369	16,535
Common stock	0	0
Additional paid-in capital	79	79
Accumulated other comprehensive loss (Note 13)	(147)	(175)
Retained earnings	5,549	4,769
Total shareholder's equity	5,481	4,673
Total liabilities and shareholder's equity	28,850	21,208
Non-Guarantors [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	896	802	768	708
Finance receivables, net	33,200	31,973
Leased vehicles, net	31,775	20,172
Restricted cash (Note 5; Note 8 VIEs)	2,036	1,881
Goodwill	103	94
Equity in net assets of non-consolidated affiliates (Note 6)	940	986
Property and equipment, net	126	178
Deferred income taxes	265	179
Related party receivables (Note 2)	797	546
Other assets	850	687
Due from affiliates	0	0
Investment in affiliates	0	0
Total assets	70,988	57,498
Secured debt (Note 7; Note 8 VIEs)	35,406	30,689
Unsecured debt (Note 7)	8,441	6,570
Accounts payable and accrued expenses	929	320
Deferred income	2,226	1,454
Deferred income taxes	661	0
Related party payables (Note 2)	407	362
Other liabilities	264	241
Due to affiliates	14,239	7,634
Total liabilities	62,573	47,270
Common stock	698	698
Additional paid-in capital	3,972	6,490
Accumulated other comprehensive loss (Note 13)	(1,029)	(1,095)
Retained earnings	4,774	4,135
Total shareholder's equity	8,415	10,228
Total liabilities and shareholder's equity	70,988	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 (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	(377)	(160)
Related party receivables (Note 2)	0	0
Other assets	(169)	0
Due from affiliates	(37,266)	(23,129)
Investment in affiliates	(13,896)	(14,901)
Total assets	(51,708)	(38,190)
Secured debt (Note 7; Note 8 VIEs)	(169)	0
Unsecured debt (Note 7)	0	0
Accounts payable and accrued expenses	0	0
Deferred income	0	0
Deferred income taxes	(377)	(160)
Related party payables (Note 2)	0	0
Other liabilities	0	0
Due to affiliates	(37,266)	(23,129)
Total liabilities	(37,812)	(23,289)
Common stock	(698)	(698)
Additional paid-in capital	(4,051)	(6,569)
Accumulated other comprehensive loss (Note 13)	1,176	1,270
Retained earnings	(10,323)	(8,904)
Total shareholder's equity	(13,896)	(14,901)
Total liabilities and shareholder's equity	$ (51,708)	$ (38,190)