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Supplementary Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								6 Months Ended	12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total net sales and revenue	$ 30,826	$ 35,473	$ 36,060	$ 34,878	$ 38,399	$ 35,791	$ 36,760	$ 36,099		$ 137,237	$ 147,049	$ 145,588
Income from continuing operations	(192)	2,311	2,403	2,145	2,069	2,530	2,366	1,110		6,667	8,075	330
Loss from discontinued operations, net of tax					0	0	0	70		0	70	4,212
Net income attributable to stockholders	$ (194)	$ 2,351	$ 2,418	$ 2,157	$ 2,044	$ 2,534	$ 2,390	$ 1,046		$ 6,732	$ 8,014	$ (3,864)
Basic earnings (loss) per common share – continuing operations (in dollars per share)	$ (0.16)	$ 1.62	$ 1.68	$ 1.50	$ 1.42	$ 1.77	$ 1.68	$ 0.78		$ 4.62	$ 5.66	$ 0.23
Basic loss per common share – discontinued operations (in dollars per share)					0	0	0	0.05		0	0.05	2.88
Diluted earnings (loss) per common share – continuing operations (in dollars per share)	$ (0.16)	$ 1.60	$ 1.66	$ 1.48	1.40	1.75	1.66	0.77		4.57	5.58	0.22
Diluted loss per common share – discontinued operations (in dollars per share)					$ 0	$ 0	$ 0	$ 0.05		$ 0	$ 0.05	$ 2.82
Non-recurring tax benefit										$ 122	$ 134	$ (7,194)
FAW-GM | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Segment Reporting Information [Line Items]
Loss on sale of discontinued operations before taxes	$ 164									164
Automotive
Segment Reporting Information [Line Items]
Automotive and other gross margin	1,273	$ 3,643	$ 4,098	$ 3,032	$ 2,935	$ 3,743	$ 3,204	$ 2,507
Facility closing | Korea
Segment Reporting Information [Line Items]
Restructuring charges and other charges									$ 1,100
Ignition Switch Recall Litigations
Segment Reporting Information [Line Items]
Ignition switch related legal matters						$ 440
Transformation Activities
Segment Reporting Information [Line Items]
Restructuring charges and other charges	$ 267	390	361	790	1,300
Foreign Tax Authority
Segment Reporting Information [Line Items]
Non-recurring tax benefit					$ 1,000
GMI | GM Brazil Indirect Tax Claim | Brazil
Segment Reporting Information [Line Items]
Estimated potential recovery from taxing authority		$ 123	$ 380	$ 857						1,400
GMI | Transformation Activities
Segment Reporting Information [Line Items]
Restructuring charges and other charges										$ 115

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