Segment Reporting (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Net sales and revenue	$ 34,167		$ 16,778		$ 66,641	$ 49,487
Earnings (loss) before interest and taxes-adjusted	4,117		(536)		8,534	714
Adjustments	(99)		(92)		(99)	(581)
Net income (loss) attributable to noncontrolling interests	(57)		(22)		(65)	(30)
Income (loss) before income taxes	3,750		(892)		7,941	(249)
Income tax benefit (expense)	(971)		112		(2,148)	(245)
Net income (loss)	2,779	$ 3,014	(780)	$ 286	5,793	(494)
Net income (loss) attributable to stockholders	2,836		(758)		5,858	(464)
Equity in net assets of nonconsolidated affiliates	8,882		7,724		8,882	7,724	$ 8,406
Goodwill and intangible assets, net	5,169		5,282		5,169	5,282	5,230
Total assets	241,803		237,535		241,803	237,535	$ 235,194
Depreciation and amortization	3,014		3,258		6,029	6,456
Impairment charges	4		7		4	117
Equity income (loss)	327		212		692	80
Automotive
Segment Reporting Information [Line Items]
Automotive interest income	32		61		64	144
Automotive interest expense	(243)		(303)		(493)	(496)
Operating Segments \| Automotive
Segment Reporting Information [Line Items]
Net sales and revenue	30,745		13,361		59,807	42,510
Earnings (loss) before interest and taxes-adjusted	2,871		(553)		6,343	679
Adjustments	(99)		(92)		(99)	(581)
Equity in net assets of nonconsolidated affiliates	7,178		6,240		7,178	6,240
Goodwill and intangible assets, net	3,081		3,219		3,081	3,219
Total assets	122,709		124,573		122,709	124,573
Depreciation and amortization	1,422		1,282		2,758	2,684
Impairment charges	0		7		0	117
Equity income (loss)	277		170		588	13
Operating Segments \| GMNA \| Automotive
Segment Reporting Information [Line Items]
Net sales and revenue	27,932		11,604		53,889	37,435
Earnings (loss) before interest and taxes-adjusted	2,894		(101)		6,028	2,093
Adjustments	(17)		0		(17)	0
Equity in net assets of nonconsolidated affiliates	482		133		482	133
Goodwill and intangible assets, net	2,292		2,399		2,292	2,399
Total assets	115,220		101,521		115,220	101,521
Depreciation and amortization	1,281		1,127		2,479	2,354
Impairment charges	0		0		0	20
Equity income (loss)	3		5		7	11
Operating Segments \| GMI \| Automotive
Segment Reporting Information [Line Items]
Net sales and revenue	2,792		1,677		5,878	4,957
Earnings (loss) before interest and taxes-adjusted	15		(270)		323	(821)
Adjustments	(82)		(92)		(82)	(581)
Equity in net assets of nonconsolidated affiliates	6,696		6,107		6,696	6,107
Goodwill and intangible assets, net	789		819		789	819
Total assets	22,203		21,494		22,203	21,494
Depreciation and amortization	137		149		269	315
Impairment charges	0		7		0	97
Equity income (loss)	274		165		581	2
Operating Segments \| Cruise
Segment Reporting Information [Line Items]
Net sales and revenue	25		28		55	53
Earnings (loss) before interest and taxes-adjusted	(332)		(195)		(561)	(423)
Adjustments	0		0		0	0
Equity in net assets of nonconsolidated affiliates	0		0		0	0
Goodwill and intangible assets, net	743		726		743	726
Total assets	5,204		3,963		5,204	3,963
Depreciation and amortization	13		11		24	19
Impairment charges	4		0		4	0
Equity income (loss)	0		0		0	0
Operating Segments \| GM Financial
Segment Reporting Information [Line Items]
Net sales and revenue	3,426		3,423		6,833	6,984
Earnings (loss) before interest and taxes-adjusted	1,581		226		2,763	456
Adjustments	0		0		0	0
Equity in net assets of nonconsolidated affiliates	1,704		1,484		1,704	1,484
Goodwill and intangible assets, net	1,345		1,337		1,345	1,337
Total assets	115,346		111,154		115,346	111,154
Depreciation and amortization	1,579		1,965		3,247	3,753
Impairment charges	0		0		0	0
Equity income (loss)	50		42		104	67
Corporate \| Automotive
Segment Reporting Information [Line Items]
Net sales and revenue	21		80		40	118
Earnings (loss) before interest and taxes-adjusted	(38)		(182)		(8)	(593)
Adjustments	0		0		0	0
Equity in net assets of nonconsolidated affiliates	0		0		0	0
Goodwill and intangible assets, net	0		1		0	1
Total assets	37,424		43,258		37,424	43,258
Depreciation and amortization	4		6		10	15
Impairment charges	0		0		0	0
Equity income (loss)	0		0		0	0
Eliminations
Segment Reporting Information [Line Items]
Net sales and revenue	(29)		(34)		(54)	(60)
Earnings (loss) before interest and taxes-adjusted	(3)		(14)		(11)	2
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	(1,456)		(2,155)		(1,456)	(2,155)
Depreciation and amortization	0		0		0	0
Impairment charges	0		0		0	0
Equity income (loss)	0		0		0	0
Eliminations \| Automotive
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	(52,138)		(41,700)		(52,138)	(41,700)
Depreciation and amortization	0		0		0	0
Impairment charges	0		0		0	0
Equity income (loss)	$ 0		$ 0		$ 0	$ 0

Earnings or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investment and net of income or loss attributable to noncontrolling interest, but before adjustments that are not considered part of our core operations, automotive interest expense, corporate interest income, gain or loss on extinguishment of debt and income tax expense or benefit.

No definition available.