Guarantor Consolidating Financial Statements - Current Period Guarantor Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	$ 4,265	$ 2,815
Finance receivables, net	42,172	33,475
Leased vehicles, net	42,882	34,342	$ 20,100
Goodwill	1,197	1,196	$ 1,189	$ 1,244
Equity in net assets of non-consolidated affiliate	1,187	944
Property and equipment, net	259	214
Deferred income taxes	249	242
Related party receivables	309	347
Other assets	4,495	3,239
Assets held for sale (Note 2)	0	10,951
Due from affiliates	0	0
Investment in affiliates	0	0
Total assets	97,015	87,765
Secured debt	39,887	35,087
Unsecured debt	40,830	29,476
Accounts payable and accrued expenses	1,622	1,324
Deferred income	3,221	2,355
Deferred income taxes	288	223
Related party payables	92	320
Other liabilities	781	594
Liabilities held for sale (Note 2)	0	9,693
Due to affiliates	0	0
Total liabilities	86,721	79,072
Common stock	0	0
Preferred stock	0	0
Additional paid-in capital	7,525	6,505
Accumulated other comprehensive loss	(768)	(1,238)
Retained earnings	3,537	3,426
Total shareholders' equity	10,294	8,693
Total liabilities and shareholders' equity	97,015	87,765
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 affiliate	0	0
Property and equipment, net	0	0
Deferred income taxes	(570)	(591)
Related party receivables	0	0
Other assets	(402)	(169)
Assets held for sale (Note 2)		(8)
Due from affiliates	(57,915)	(40,613)
Investment in affiliates	(16,296)	(15,431)
Total assets	(75,183)	(56,812)
Secured debt	(402)	(169)
Unsecured debt	0	0
Accounts payable and accrued expenses	0	0
Deferred income	0	0
Deferred income taxes	(570)	(591)
Related party payables	0	0
Other liabilities	0	0
Liabilities held for sale (Note 2)		(1)
Due to affiliates	(57,915)	(40,620)
Total liabilities	(58,887)	(41,381)
Common stock	(698)	(698)
Preferred stock	0
Additional paid-in capital	(2,202)	(5,424)
Accumulated other comprehensive loss	823	1,384
Retained earnings	(14,219)	(10,693)
Total shareholders' equity	(16,296)	(15,431)
Total liabilities and shareholders' equity	(75,183)	(56,812)
General Motors Financial Company, Inc. [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 affiliate	0	0
Property and equipment, net	0	0
Deferred income taxes	549	502
Related party receivables	2	0
Other assets	9	4
Assets held for sale (Note 2)		0
Due from affiliates	35,312	24,548
Investment in affiliates	9,870	8,986
Total assets	46,837	35,135
Secured debt	0	0
Unsecured debt	36,145	26,076
Accounts payable and accrued expenses	338	302
Deferred income	0	0
Deferred income taxes	0	0
Related party payables	2	1
Other liabilities	58	63
Liabilities held for sale (Note 2)		0
Due to affiliates	0	0
Total liabilities	36,543	26,442
Common stock	0	0
Preferred stock	0
Additional paid-in capital	7,525	6,505
Accumulated other comprehensive loss	(768)	(1,238)
Retained earnings	3,537	3,426
Total shareholders' equity	10,294	8,693
Total liabilities and shareholders' equity	46,837	35,135
Guarantor [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	3,535	2,284
Finance receivables, net	9,569	4,969
Leased vehicles, net	0	0
Goodwill	0	0
Equity in net assets of non-consolidated affiliate	0	0
Property and equipment, net	192	152
Deferred income taxes	21	89
Related party receivables	23	25
Other assets	1,284	643
Assets held for sale (Note 2)		0
Due from affiliates	22,603	16,065
Investment in affiliates	6,426	6,445
Total assets	43,653	30,672
Secured debt	0	0
Unsecured debt	0	0
Accounts payable and accrued expenses	382	273
Deferred income	0	0
Deferred income taxes	0	0
Related party payables	0	0
Other liabilities	585	417
Liabilities held for sale (Note 2)		0
Due to affiliates	35,110	24,437
Total liabilities	36,077	25,127
Common stock	0	0
Preferred stock	0
Additional paid-in capital	79	79
Accumulated other comprehensive loss	(109)	(161)
Retained earnings	7,606	5,627
Total shareholders' equity	7,576	5,545
Total liabilities and shareholders' equity	43,653	30,672
Non-Guarantors [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	730	531
Finance receivables, net	32,603	28,506
Leased vehicles, net	42,882	34,342
Goodwill	102	101
Equity in net assets of non-consolidated affiliate	1,187	944
Property and equipment, net	67	62
Deferred income taxes	249	242
Related party receivables	284	322
Other assets	3,604	2,761
Assets held for sale (Note 2)		10,959
Due from affiliates	0	0
Investment in affiliates	0	0
Total assets	81,708	78,770
Secured debt	40,289	35,256
Unsecured debt	4,685	3,400
Accounts payable and accrued expenses	902	749
Deferred income	3,221	2,355
Deferred income taxes	858	814
Related party payables	90	319
Other liabilities	138	114
Liabilities held for sale (Note 2)		9,694
Due to affiliates	22,805	16,183
Total liabilities	72,988	68,884
Common stock	698	698
Preferred stock	0
Additional paid-in capital	2,123	5,345
Accumulated other comprehensive loss	(714)	(1,223)
Retained earnings	6,613	5,066
Total shareholders' equity	8,720	9,886
Total liabilities and shareholders' equity	$ 81,708	$ 78,770