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Segment Reporting (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Net sales and revenue	$ 35,473			$ 35,791	$ 106,411	$ 108,650
Earnings (loss) before interest and taxes-adjusted	2,966			3,153	8,288	8,955
Adjustments	(267)			(440)	(181)	(1,578)
Net income (loss) attributable to noncontrolling interests	(40)			(4)	(67)	(34)
Income before income taxes	2,582			2,630	7,791	7,091
Income tax benefit (expense)	(271)			(100)	(932)	(1,085)
Income from continuing operations	2,311			2,530	6,859	6,006
(Loss) from discontinued operations, net of tax	0			0	0	(70)
Net income attributable to stockholders	2,351			2,534	6,926	5,970
Equity in net assets of nonconsolidated affiliates	8,496			9,155	8,496	9,155	$ 9,215
Goodwill and intangible assets, net	5,408			5,651	5,408	5,651	5,579
Total assets	231,529			225,711	231,529	225,711	$ 227,339
Depreciation and amortization	3,308			3,305	10,813	9,501
Impairment charges	1			8	19	522
Equity income	315			530	1,000	1,815
Brazil [Member] | GM Brazil Indirect Tax Claim [Member]
Segment Reporting Information [Line Items]
Favorable settlement amount	123	$ 380	$ 857
Automotive [Member]
Segment Reporting Information [Line Items]
Automotive interest income	129			82	333	218
Automotive interest expense	(206)			(161)	(582)	(470)
GMNA [Member] | Transformation Activities [Member]
Segment Reporting Information [Line Items]
Pre-tax restructuring costs	390				1,500
GMI [Member] | Brazil [Member] | GM Brazil Indirect Tax Claim [Member]
Segment Reporting Information [Line Items]
Favorable settlement amount	123				1,400
GMI [Member] | Separation Programs In Korea [Member]
Segment Reporting Information [Line Items]
Pre-tax restructuring costs						1,100
Operating Segments [Member] | Automotive [Member]
Segment Reporting Information [Line Items]
Net sales and revenue	31,817			32,288	95,503	98,312
Earnings (loss) before interest and taxes-adjusted	2,507			2,870	7,398	8,012
Adjustments	(267)			(440)	(181)	(1,578)
Equity in net assets of nonconsolidated affiliates	7,115			7,847	7,115	7,847
Goodwill and intangible assets, net	3,385			3,615	3,385	3,615
Total assets	119,485			118,896	119,485	118,896
Depreciation and amortization	1,469			1,399	5,218	3,936
Impairment charges	1			8	19	522
Equity income	276			486	874	1,674
Operating Segments [Member] | GMNA [Member] | Automotive [Member]
Segment Reporting Information [Line Items]
Net sales and revenue	27,971			27,650	83,660	83,969
Earnings (loss) before interest and taxes-adjusted	3,023			2,825	7,941	7,728
Adjustments	(359)			0	(1,478)	0
Equity in net assets of nonconsolidated affiliates	85			77	85	77
Goodwill and intangible assets, net	2,488			2,674	2,488	2,674
Total assets	115,995			110,245	115,995	110,245
Depreciation and amortization	1,325			1,251	4,803	3,474
Impairment charges	0			0	15	53
Equity income	3			2	7	7
Operating Segments [Member] | GMI [Member] | Automotive [Member]
Segment Reporting Information [Line Items]
Net sales and revenue	3,794			4,582	11,691	14,188
Earnings (loss) before interest and taxes-adjusted	(65)			139	(82)	471
Adjustments	92			0	1,299	(1,138)
Equity in net assets of nonconsolidated affiliates	7,024			7,770	7,024	7,770
Goodwill and intangible assets, net	896			939	896	939
Total assets	25,562			25,780	25,562	25,780
Depreciation and amortization	133			136	379	426
Impairment charges	1			2	4	463
Equity income	279			484	886	1,667
Operating Segments [Member] | Cruise [Member]
Segment Reporting Information [Line Items]
Net sales and revenue	25			0	75	0
Earnings (loss) before interest and taxes-adjusted	(251)			(214)	(699)	(534)
Adjustments	0			0	0	0
Equity in net assets of nonconsolidated affiliates	0			0	0	0
Goodwill and intangible assets, net	670			679	670	679
Total assets	4,406			2,567	4,406	2,567
Depreciation and amortization	7			2	16	5
Impairment charges	0			0	0	0
Equity income	0			0	0	0
Operating Segments [Member] | GM Financial [Member]
Segment Reporting Information [Line Items]
Net sales and revenue	3,659			3,518	10,918	10,417
Earnings (loss) before interest and taxes-adjusted	711			498	1,606	1,477
Adjustments	0			0	0	0
Equity in net assets of nonconsolidated affiliates	1,381			1,308	1,381	1,308
Goodwill and intangible assets, net	1,353			1,357	1,353	1,357
Total assets	109,099			105,658	109,099	105,658
Depreciation and amortization	1,832			1,904	5,579	5,560
Impairment charges	0			0	0	0
Equity income	39			44	126	141
Corporate [Member] | Ignition Switch Recall Litigations [Member]
Segment Reporting Information [Line Items]
Charges for legal related matters						440
Corporate [Member] | Automotive [Member]
Segment Reporting Information [Line Items]
Net sales and revenue	52			56	152	155
Earnings (loss) before interest and taxes-adjusted	(451)			(94)	(461)	(187)
Adjustments	0			(440)	(2)	(440)
Equity in net assets of nonconsolidated affiliates	6			0	6	0
Goodwill and intangible assets, net	1			2	1	2
Total assets	34,309			28,194	34,309	28,194
Depreciation and amortization	11			12	36	36
Impairment charges	0			6	0	6
Equity income	(6)			0	(19)	0
Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales and revenue	(28)			(15)	(85)	(79)
Earnings (loss) before interest and taxes-adjusted	(1)			(1)	(17)	0
Adjustments	0			0	0	0
Equity in net assets of nonconsolidated affiliates	0			0	0	0
Goodwill and intangible assets, net	0			0	0	0
Total assets	(1,461)			(1,410)	(1,461)	(1,410)
Depreciation and amortization	0			0	0	0
Impairment charges	0			0	0	0
Equity income	0			0	0	0
Eliminations [Member] | Automotive [Member]
Segment Reporting Information [Line Items]
Equity in net assets of nonconsolidated affiliates	0			0	0	0
Goodwill and intangible assets, net	0			0	0	0
Total assets	(56,381)			(45,323)	(56,381)	(45,323)
Depreciation and amortization	0			0	0	0
Impairment charges	0			0	0	0
Equity income	$ 0			$ 0	$ 0	$ 0

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