Guarantor Consolidating Financial Statements - Guarantor Income Statements (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Income Statements, Captions [Line Items]
Finance charge income									$ 3,329	$ 3,381	$ 3,475
Leased vehicle income									5,925	2,807	1,090
Other income									304	266	289
Total revenue	$ 2,692	$ 2,499	$ 2,292	$ 2,075	$ 1,878	$ 1,707	$ 1,515	$ 1,354	9,558	6,454	4,854
Salaries and benefits									853	726	614
Other operating expenses									637	567	548
Total operating expenses									1,490	1,293	1,162
Leased vehicle expenses									4,529	2,200	847
Provision for loan losses									669	624	604
Interest expense									2,108	1,616	1,426
Total costs and expenses									8,796	5,733	4,039
Equity income									151	116	0
Income before income taxes	194	228	266	225	167	231	225	214	913	837	815
Income tax (benefit) provision									159	191	278
Net income	$ 254	$ 147	$ 189	$ 164	$ 131	$ 179	$ 186	$ 150	754	646	537
Comprehensive (loss) income									620	(25)	93
General Motors Financial Company, Inc. [Member]
Condensed Income Statements, Captions [Line Items]
Finance charge income									0	0	0
Leased vehicle income									0	0	0
Other income									(1)	13	68
Total revenue									(1)	13	68
Salaries and benefits									0	0	0
Other operating expenses									2	64	159
Total operating expenses									2	64	159
Leased vehicle expenses									0	0	0
Provision for loan losses									0	0	0
Interest expense									557	488	232
Total costs and expenses									559	552	391
Equity income									994	941	757
Income before income taxes									434	402	434
Income tax (benefit) provision									(320)	(244)	(103)
Net income									754	646	537
Comprehensive (loss) income									620	(25)	93
Guarantor [Member]
Condensed Income Statements, Captions [Line Items]
Finance charge income									432	403	194
Leased vehicle income									0	0	0
Other income									883	505	432
Total revenue									1,315	908	626
Salaries and benefits									597	332	249
Other operating expenses									200	105	(17)
Total operating expenses									797	437	232
Leased vehicle expenses									0	0	0
Provision for loan losses									378	398	334
Interest expense									296	18	23
Total costs and expenses									1,471	853	589
Equity income									771	579	523
Income before income taxes									615	634	560
Income tax (benefit) provision									(89)	25	12
Net income									704	609	548
Comprehensive (loss) income									718	498	491
Non-Guarantors [Member]
Condensed Income Statements, Captions [Line Items]
Finance charge income									2,897	2,978	3,281
Leased vehicle income									5,925	2,807	1,090
Other income									97	139	178
Total revenue									8,919	5,924	4,549
Salaries and benefits									256	394	365
Other operating expenses									837	649	657
Total operating expenses									1,093	1,043	1,022
Leased vehicle expenses									4,529	2,200	847
Provision for loan losses									291	226	270
Interest expense									1,528	1,250	1,309
Total costs and expenses									7,441	4,719	3,448
Equity income									151	116	0
Income before income taxes									1,629	1,321	1,101
Income tax (benefit) provision									568	410	369
Net income									1,061	911	732
Comprehensive (loss) income									933	225	298
Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Finance charge income									0	0	0
Leased vehicle income									0	0	0
Other income									(675)	(391)	(389)
Total revenue									(675)	(391)	(389)
Salaries and benefits									0	0	0
Other operating expenses									(402)	(251)	(251)
Total operating expenses									(402)	(251)	(251)
Leased vehicle expenses									0	0	0
Provision for loan losses									0	0	0
Interest expense									(273)	(140)	(138)
Total costs and expenses									(675)	(391)	(389)
Equity income									(1,765)	(1,520)	(1,280)
Income before income taxes									(1,765)	(1,520)	(1,280)
Income tax (benefit) provision									0	0	0
Net income									(1,765)	(1,520)	(1,280)
Comprehensive (loss) income									$ (1,651)	$ (723)	$ (789)