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Segment Reporting Summary of key financial information by segment (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	Jun. 30, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue and others for Reportable Segment [Abstract]
Total net sales and revenue	$ 43,918	$ 42,825	$ 42,372	$ 37,265	$ 39,621	$ 38,843	$ 38,180	$ 35,712		$ 166,380	$ 152,356	$ 155,929
Income (loss) before interest and taxes adjusted										12,530	10,814	6,494
Adjustments										(300)	(3,199)	(2,327)
Automotive interest expense										(2,680)	(2,059)	(1,829)
Gain on extinguishment of debt										0	449	202
Income before income taxes										11,684	7,718	4,246
Income tax benefit (expense)										(2,416)	1,897	(228)
Net (income) loss attributable to noncontrolling interests										159	72	(69)
Net income attributable to stockholders	1,835	$ 2,773	$ 2,866	$ 1,953	6,266	1,359	1,117	945		9,427	9,687	3,949
Equity in net assets of nonconsolidated affiliates	8,996				9,201					8,996	9,201	8,350
Total Assets	221,690				194,338					221,690	194,338	177,311
Expenditures for property										9,542	7,874	7,091
Depreciation and amortization										10,152	7,171	6,238
Impairment charges (excluding goodwill)										256	846	880
Equity Income										2,282	2,194	2,094
Goodwill impairment charges										0	0	120
GMNA [Member] | Warranty Obligations [Member]
Revenue and others for Reportable Segment [Abstract]
Catch-up adjustment, change in estimate for recall campaigns									$ 874
GMIO [Member] | Thailand
Revenue and others for Reportable Segment [Abstract]
Tangible Asset Impairment Charges							297
GMSA [Member] | Venezuela
Revenue and others for Reportable Segment [Abstract]
Charge for foreign currency devaluation							$ 604
Corporate [Member] | Ignition Switch Recall Litigations [Member]
Revenue and others for Reportable Segment [Abstract]
Charges for various legal matters related to the Ignition Switch Recall						$ 1,500
Corporate [Member] | Ignition Switch Recall Compensation Program [Member]
Revenue and others for Reportable Segment [Abstract]
Charge related to ignition switch recall compensation program								150
Automotive [Member]
Revenue and others for Reportable Segment [Abstract]
Automotive Interest Income										185	169	211
Automotive interest expense										(572)	(443)	(403)
Gain on extinguishment of debt											449	202
Automotive [Member] | Operating Segments [Member] | GMSA [Member] | Venezuela
Revenue and others for Reportable Segment [Abstract]
Charge for foreign currency devaluation												419
Automotive [Member] | Intersegment Eliminations [Member]
Revenue and others for Reportable Segment [Abstract]
Equity in net assets of nonconsolidated affiliates	0				0					0	0	0
Total Assets	(36,752)				(24,083)					(36,752)	(24,083)	(29,041)
Expenditures for property										(2)	(5)	0
Depreciation and amortization										(5)	(3)	(4)
Impairment charges (excluding goodwill)										0	0	0
Equity Income										0	0	0
Group [Member] | Automotive [Member] | Operating Segments [Member]
Revenue and others for Reportable Segment [Abstract]
Total net sales and revenue										156,849	145,922	151,092
Income (loss) before interest and taxes adjusted										11,631	9,987	5,696
Adjustments										(300)	(3,199)	(2,339)
Equity in net assets of nonconsolidated affiliates	8,052				8,215					8,052	8,215	8,350
Total Assets	135,055				129,421					135,055	129,421	131,484
Expenditures for property										9,435	7,784	7,039
Depreciation and amortization										5,440	4,874	5,320
Impairment charges (excluding goodwill)										256	846	880
Equity Income										2,131	2,078	2,094
Other Adjustments											41	111
Group [Member] | Automotive [Member] | Operating Segments [Member] | GMNA [Member]
Revenue and others for Reportable Segment [Abstract]
Total net sales and revenue										119,022	106,622	101,199
Income (loss) before interest and taxes adjusted										12,047	11,026	6,603
Adjustments										0	47	(975)
Equity in net assets of nonconsolidated affiliates	74				94					74	94	88
Total Assets	103,738				92,480					103,738	92,480	92,781
Expenditures for property										7,333	5,688	4,985
Depreciation and amortization										4,281	3,745	4,122
Impairment charges (excluding goodwill)										66	370	254
Equity Income										160	20	19
Group [Member] | Automotive [Member] | Operating Segments [Member] | GMNA [Member] | Warranty Obligations [Member]
Revenue and others for Reportable Segment [Abstract]
Catch-up adjustment, change in estimate for recall campaigns												874
Group [Member] | Automotive [Member] | Operating Segments [Member] | GME [Member]
Revenue and others for Reportable Segment [Abstract]
Total net sales and revenue										18,707	18,704	22,235
Income (loss) before interest and taxes adjusted										(257)	(813)	(1,369)
Adjustments										0	(358)	(245)
Equity in net assets of nonconsolidated affiliates	0				6					0	6	6
Total Assets	13,262				13,343					13,262	13,343	10,460
Expenditures for property										1,151	1,070	887
Depreciation and amortization										446	412	325
Impairment charges (excluding goodwill)										122	117	302
Equity Income										0	2	(45)
Group [Member] | Automotive [Member] | Operating Segments [Member] | GME [Member] | Russian Federation
Revenue and others for Reportable Segment [Abstract]
Asset Impairment Charges												245
Group [Member] | Automotive [Member] | Operating Segments [Member] | GMIO [Member]
Revenue and others for Reportable Segment [Abstract]
Total net sales and revenue										11,749	12,626	14,392
Income (loss) before interest and taxes adjusted										1,135	1,397	1,222
Adjustments										0	(383)	(180)
Equity in net assets of nonconsolidated affiliates	7,976				8,113					7,976	8,113	8,254
Total Assets	20,205				20,540					20,205	20,540	22,910
Expenditures for property										583	480	681
Depreciation and amortization										439	436	419
Impairment charges (excluding goodwill)										68	324	321
Equity Income										1,970	2,056	2,120
Group [Member] | Automotive [Member] | Operating Segments [Member] | GMIO [Member] | Thailand
Revenue and others for Reportable Segment [Abstract]
Tangible Asset Impairment Charges											297	158
Group [Member] | Automotive [Member] | Operating Segments [Member] | GMSA [Member]
Revenue and others for Reportable Segment [Abstract]
Total net sales and revenue										7,223	7,820	13,115
Income (loss) before interest and taxes adjusted										(374)	(622)	(180)
Adjustments										0	(720)	(539)
Equity in net assets of nonconsolidated affiliates	2				2					2	2	2
Total Assets	7,439				6,990					7,439	6,990	10,066
Expenditures for property										358	485	359
Depreciation and amortization										261	268	383
Impairment charges (excluding goodwill)										0	35	3
Equity Income										0	0	0
Goodwill impairment charges												120
Group [Member] | Automotive [Member] | Operating Segments [Member] | GMSA [Member] | Venezuela
Revenue and others for Reportable Segment [Abstract]
Charge for foreign currency devaluation											720
Group [Member] | Automotive [Member] | Corporate [Member]
Revenue and others for Reportable Segment [Abstract]
Total net sales and revenue										148	150	151
Income (loss) before interest and taxes adjusted										(920)	(1,001)	(580)
Adjustments										(300)	(1,785)	(400)
Equity in net assets of nonconsolidated affiliates	0				0					0	0	0
Total Assets	27,163				20,151					27,163	20,151	24,308
Expenditures for property										12	66	127
Depreciation and amortization										18	16	75
Impairment charges (excluding goodwill)										0	0	0
Equity Income										1	0	0
Group [Member] | Automotive [Member] | Corporate [Member] | Ignition Switch Recall Litigations [Member]
Revenue and others for Reportable Segment [Abstract]
Litigation Settlement Expense, Net										300
Charges for various legal matters related to the Ignition Switch Recall											1,600
Group [Member] | Automotive [Member] | Corporate [Member] | Ignition Switch Recall Compensation Program [Member]
Revenue and others for Reportable Segment [Abstract]
Charge related to ignition switch recall compensation program											195	400
Group [Member] | GM Financial [Member] | Operating Segments [Member] | GM Financial Segment [Member]
Revenue and others for Reportable Segment [Abstract]
Total net sales and revenue										9,558	6,454	4,854
Income (loss) before interest and taxes adjusted										913	837	803
Adjustments										0	0	12
Equity in net assets of nonconsolidated affiliates	944				986					944	986	0
Total Assets	87,947				66,081					87,947	66,081	47,745
Expenditures for property										107	90	52
Depreciation and amortization										4,712	2,297	918
Impairment charges (excluding goodwill)										0	0	0
Equity Income										151	116	0
InterGroup Elimination [Member]
Revenue and others for Reportable Segment [Abstract]
Total net sales and revenue										(27)	(20)	(17)
Income (loss) before interest and taxes adjusted										(14)	(10)	(5)
Adjustments										0	0	0
Equity in net assets of nonconsolidated affiliates	0				0					0	0	0
Total Assets	$ (1,312)				$ (1,164)					(1,312)	(1,164)	(1,918)
Expenditures for property										0	0	0
Depreciation and amortization										0	0	0
Impairment charges (excluding goodwill)										0	0	0
Equity Income										$ 0	0	$ 0
Russia exit [Member] | GME [Member]
Revenue and others for Reportable Segment [Abstract]
Cost Related to Business Withdrawal								337
Russia exit [Member] | GMIO [Member]
Revenue and others for Reportable Segment [Abstract]
Cost Related to Business Withdrawal								$ 91
Russia exit [Member] | Group [Member] | Automotive [Member] | Operating Segments [Member] | GME [Member]
Revenue and others for Reportable Segment [Abstract]
Cost Related to Business Withdrawal											353
Russia exit [Member] | Group [Member] | Automotive [Member] | Operating Segments [Member] | GMIO [Member]
Revenue and others for Reportable Segment [Abstract]
Cost Related to Business Withdrawal											$ 85

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