Guarantor Condensed Consolidating Financial Statements - Current Period Guarantor Balance Sheet (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	$ 2,694	$ 3,201
Finance receivables, net	46,910	43,190
Leased vehicles, net	37,302	34,526
Goodwill	1,200	1,196
Equity in net assets of non-consolidated affiliates (Note 6)	998	944
Property and equipment, net	291	279
Deferred income taxes	284	274
Related party receivables (Note 3)	617	510
Other assets (Note 8 VIEs)	4,244	3,645
Due from affiliates	0	0
Investment in affiliates	0	0
Total assets	94,540	87,765
Secured debt (Note 7; Note 8 VIEs)	42,579	39,270
Unsecured debt (Note 7)	37,370	34,606
Accounts payable and accrued expenses	1,501	1,474
Deferred income	2,588	2,365
Deferred income taxes	259	220
Related party payables (Note 3)	448	400
Other liabilities	803	737
Due to affiliates	0	0
Total liabilities	85,548	79,072
Common stock	0	0
Additional paid-in capital	6,512	6,505
Accumulated other comprehensive loss (Note 13)	(1,148)	(1,238)
Retained earnings	3,628	3,426
Total shareholder's equity	8,992	8,693
Total liabilities and shareholder's equity	94,540	87,765
Parent Company [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	0	0
Finance receivables, net	0	0
Leased vehicles, net	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	613	502
Related party receivables (Note 3)	0	0
Other assets (Note 8 VIEs)	3	4
Due from affiliates	26,778	24,548
Investment in affiliates	9,401	8,986
Total assets	37,890	35,135
Secured debt (Note 7; Note 8 VIEs)	0	0
Unsecured debt (Note 7)	28,573	26,076
Accounts payable and accrued expenses	261	302
Deferred income	0	0
Deferred income taxes	0	0
Related party payables (Note 3)	1	1
Other liabilities	63	63
Due to affiliates	0	0
Total liabilities	28,898	26,442
Common stock	0	0
Additional paid-in capital	6,512	6,505
Accumulated other comprehensive loss (Note 13)	(1,148)	(1,238)
Retained earnings	3,628	3,426
Total shareholder's equity	8,992	8,693
Total liabilities and shareholder's equity	37,890	35,135
Guarantor [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	2,040	2,284
Finance receivables, net	7,516	4,969
Leased vehicles, net	0	0
Goodwill	0	0
Equity in net assets of non-consolidated affiliates (Note 6)	0	0
Property and equipment, net	163	152
Deferred income taxes	75	89
Related party receivables (Note 3)	73	25
Other assets (Note 8 VIEs)	746	643
Due from affiliates	15,992	16,065
Investment in affiliates	5,971	6,445
Total assets	32,576	30,672
Secured debt (Note 7; Note 8 VIEs)	0	0
Unsecured debt (Note 7)	0	0
Accounts payable and accrued expenses	330	273
Deferred income	0	0
Deferred income taxes	0	0
Related party payables (Note 3)	0	0
Other liabilities	476	417
Due to affiliates	25,977	24,437
Total liabilities	26,783	25,127
Common stock	0	0
Additional paid-in capital	79	79
Accumulated other comprehensive loss (Note 13)	(157)	(161)
Retained earnings	5,871	5,627
Total shareholder's equity	5,793	5,545
Total liabilities and shareholder's equity	32,576	30,672
Non-Guarantors [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	654	917
Finance receivables, net	39,394	38,221
Leased vehicles, net	37,302	34,526
Goodwill	105	101
Equity in net assets of non-consolidated affiliates (Note 6)	998	944
Property and equipment, net	128	127
Deferred income taxes	284	274
Related party receivables (Note 3)	544	485
Other assets (Note 8 VIEs)	3,743	3,167
Due from affiliates	0	0
Investment in affiliates	0	0
Total assets	83,152	78,762
Secured debt (Note 7; Note 8 VIEs)	42,827	39,439
Unsecured debt (Note 7)	8,797	8,530
Accounts payable and accrued expenses	910	899
Deferred income	2,588	2,365
Deferred income taxes	947	811
Related party payables (Note 3)	447	399
Other liabilities	264	257
Due to affiliates	16,793	16,176
Total liabilities	73,573	68,876
Common stock	698	698
Additional paid-in capital	4,652	5,345
Accumulated other comprehensive loss (Note 13)	(1,123)	(1,223)
Retained earnings	5,352	5,066
Total shareholder's equity	9,579	9,886
Total liabilities and shareholder's equity	83,152	78,762
Eliminations [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	0	0
Finance receivables, net	0	0
Leased vehicles, net	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	(688)	(591)
Related party receivables (Note 3)	0	0
Other assets (Note 8 VIEs)	(248)	(169)
Due from affiliates	(42,770)	(40,613)
Investment in affiliates	(15,372)	(15,431)
Total assets	(59,078)	(56,804)
Secured debt (Note 7; Note 8 VIEs)	(248)	(169)
Unsecured debt (Note 7)	0	0
Accounts payable and accrued expenses	0	0
Deferred income	0	0
Deferred income taxes	(688)	(591)
Related party payables (Note 3)	0	0
Other liabilities	0	0
Due to affiliates	(42,770)	(40,613)
Total liabilities	(43,706)	(41,373)
Common stock	(698)	(698)
Additional paid-in capital	(4,731)	(5,424)
Accumulated other comprehensive loss (Note 13)	1,280	1,384
Retained earnings	(11,223)	(10,693)
Total shareholder's equity	(15,372)	(15,431)
Total liabilities and shareholder's equity	$ (59,078)	$ (56,804)