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Segment Reporting (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Net sales and revenue	$ 32,709	$ 34,878
Earnings (loss) before interest and taxes-adjusted	1,250	2,310
Adjustments	(489)	67
Net income (loss) attributable to noncontrolling interests	(8)	(12)
Income before income taxes	643	2,282
Income tax benefit (expense)	(357)	(137)
Net income	286	2,145
Net income attributable to stockholders	294	2,157
Equity in net assets of nonconsolidated affiliates	7,521	8,266	$ 8,562
Goodwill and intangible assets, net	5,225	5,518	5,337
Total assets	246,624	233,132	$ 228,037
Depreciation and amortization	3,198	4,109
Impairment charges	110	7
Equity income	(132)	414
Brazil [Member] | GM Brazil Indirect Tax Claim [Member]
Segment Reporting Information [Line Items]
Recoveries of indirect taxes		857
Automotive [Member]
Segment Reporting Information [Line Items]
Automotive interest income	83	98
Automotive interest expense	(193)	(181)
GMNA [Member] | Transformation Activities [Member]
Segment Reporting Information [Line Items]
Pre-tax restructuring costs		790
GMI [Member] | Brazil [Member] | GM Brazil Indirect Tax Claim [Member]
Segment Reporting Information [Line Items]
Recoveries of indirect taxes		857
Operating Segments [Member] | Automotive [Member]
Segment Reporting Information [Line Items]
Net sales and revenue	29,149	31,261
Earnings (loss) before interest and taxes-adjusted	1,232	2,133
Adjustments	(489)	67
Equity in net assets of nonconsolidated affiliates	6,084	6,837
Goodwill and intangible assets, net	3,253	3,491
Total assets	128,571	120,073
Depreciation and amortization	1,402	2,208
Impairment charges	110	7
Equity income	(157)	369
Operating Segments [Member] | GMNA [Member] | Automotive [Member]
Segment Reporting Information [Line Items]
Net sales and revenue	25,831	27,365
Earnings (loss) before interest and taxes-adjusted	2,194	1,896
Adjustments	0	(783)
Equity in net assets of nonconsolidated affiliates	93	80
Goodwill and intangible assets, net	2,432	2,572
Total assets	109,159	112,455
Depreciation and amortization	1,227	2,069
Impairment charges	20	7
Equity income	6	2
Operating Segments [Member] | GMI [Member] | Automotive [Member]
Segment Reporting Information [Line Items]
Net sales and revenue	3,280	3,850
Earnings (loss) before interest and taxes-adjusted	(551)	31
Adjustments	(489)	850
Equity in net assets of nonconsolidated affiliates	5,991	6,739
Goodwill and intangible assets, net	820	918
Total assets	23,213	27,580
Depreciation and amortization	166	127
Impairment charges	90	0
Equity income	(163)	374
Operating Segments [Member] | Cruise [Member]
Segment Reporting Information [Line Items]
Net sales and revenue	25	25
Earnings (loss) before interest and taxes-adjusted	(228)	(169)
Adjustments	0	0
Equity in net assets of nonconsolidated affiliates	0	0
Goodwill and intangible assets, net	634	670
Total assets	4,069	3,228
Depreciation and amortization	8	2
Impairment charges	0	0
Equity income	0	0
Operating Segments [Member] | GM Financial [Member]
Segment Reporting Information [Line Items]
Net sales and revenue	3,561	3,620
Earnings (loss) before interest and taxes-adjusted	230	359
Adjustments	0	0
Equity in net assets of nonconsolidated affiliates	1,437	1,429
Goodwill and intangible assets, net	1,338	1,357
Total assets	115,381	111,220
Depreciation and amortization	1,788	1,899
Impairment charges	0	0
Equity income	25	45
Corporate [Member] | Automotive [Member]
Segment Reporting Information [Line Items]
Net sales and revenue	38	46
Earnings (loss) before interest and taxes-adjusted	(411)	206
Adjustments	0	0
Equity in net assets of nonconsolidated affiliates	0	18
Goodwill and intangible assets, net	1	1
Total assets	45,965	27,937
Depreciation and amortization	9	12
Impairment charges	0	0
Equity income	0	(7)
Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales and revenue	(26)	(28)
Earnings (loss) before interest and taxes-adjusted	16	(13)
Adjustments	0	0
Equity in net assets of nonconsolidated affiliates	0	0
Goodwill and intangible assets, net	0	0
Total assets	(1,397)	(1,389)
Depreciation and amortization	0	0
Impairment charges	0	0
Equity income	0	0
Eliminations [Member] | Automotive [Member]
Segment Reporting Information [Line Items]
Equity in net assets of nonconsolidated affiliates	0	0
Goodwill and intangible assets, net	0	0
Total assets	(49,766)	(47,899)
Depreciation and amortization	0	0
Impairment charges	0	0
Equity income	$ 0	$ 0

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