Segment Reporting (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Segment Reporting [Abstract]
Number of reportable segments disclosed by definition			GMNA, GMI, and GM Financial
Segment Reporting [Line Items]
Net sales and revenue	$ 50,015	$ 48,591	$ 141,665	$ 139,732
Net income (loss) attributable to noncontrolling interests	42	(35)	168	33
Income (loss) before income taxes	3,943	1,419	8,858	7,366
Equity in net assets of nonconsolidated affiliates	5,379	6,272	5,379	6,272	$ 5,681
Goodwill and intangibles	4,276	4,452	4,276	4,452	4,366
Total assets	289,183	288,168	289,183	288,168	281,284
Expenditures for property	2,346	2,130	5,800	6,083
Depreciation and amortization	2,935	3,066	9,042	9,026
Impairment charges	(60)	1,044	(34)	1,063
Equity income (loss)	228	290	169	684
Additions, interest accretion, and other	269	366	2,493	868
GMNA
Segment Reporting [Line Items]
Additions, interest accretion, and other					$ 7,900
GMNA \| Impaired Emissions Credits
Segment Reporting [Line Items]
Additions, interest accretion, and other			493
Operating Segments
Segment Reporting [Line Items]
Net sales and revenue	49,816	48,533	141,222	139,579
Earnings (loss) before interest and taxes-adjusted	4,289	3,536	13,003	10,587
Adjustments	(238)	(1,917)	(3,693)	(2,572)
Equity in net assets of nonconsolidated affiliates	4,954	6,007	4,954	6,007
Goodwill and intangibles	4,276	4,452	4,276	4,452
Total assets	334,043	328,276	334,043	328,276
Expenditures for property	2,345	2,119	5,748	6,033
Depreciation and amortization	2,929	3,063	9,025	8,986
Impairment charges	(60)	1,044	(34)	1,063
Equity income (loss)	267	307	290	714
Operating Segments \| GMNA
Segment Reporting [Line Items]
Net sales and revenue	41,419	40,551	117,732	117,424
Segment expenses and other items	(37,827)	(38,045)	(107,032)	(109,217)
Earnings (loss) before interest and taxes-adjusted	3,592	2,506	10,699	8,207
Adjustments	(238)	(1,917)	(3,771)	(2,312)
Equity in net assets of nonconsolidated affiliates	2,927	3,324	2,927	3,324
Goodwill and intangibles	2,299	2,449	2,299	2,449
Total assets	174,746	164,001	174,746	164,001
Expenditures for property	2,235	2,011	5,495	5,729
Depreciation and amortization	1,564	1,703	4,754	4,933
Impairment charges	(79)	1,044	(53)	1,044
Equity income (loss)	229	214	(18)	469
Operating Segments \| GMI
Segment Reporting [Line Items]
Net sales and revenue	4,085	3,645	10,635	9,398
Segment expenses and other items	(4,057)	(3,419)	(10,293)	(8,938)
Earnings (loss) before interest and taxes-adjusted	28	226	342	460
Adjustments	0	0	78	(260)
Equity in net assets of nonconsolidated affiliates	1,035	1,588	1,035	1,588
Goodwill and intangibles	627	655	627	655
Total assets	20,001	22,690	20,001	22,690
Expenditures for property	98	92	211	274
Depreciation and amortization	121	114	362	347
Impairment charges	19	0	19	18
Equity income (loss)	30	83	273	208
Operating Segments \| Cruise
Segment Reporting [Line Items]
Net sales and revenue		0		1
Segment expenses and other items				(274)
Earnings (loss) before interest and taxes-adjusted				(273)
Adjustments				0
Equity in net assets of nonconsolidated affiliates		0		0
Goodwill and intangibles		1		1
Total assets		309		309
Expenditures for property		0		2
Depreciation and amortization		0		5
Impairment charges		0		0
Equity income (loss)		0		0
Operating Segments \| GM Financial
Segment Reporting [Line Items]
Net sales and revenue	4,312	4,337	12,855	12,756
Segment expenses and other items	(3,643)	(3,533)	(10,893)	(10,563)
Earnings (loss) before interest and taxes-adjusted	668	804	1,962	2,193
Adjustments	0	0	0	0
Equity in net assets of nonconsolidated affiliates	992	1,095	992	1,095
Goodwill and intangibles	1,350	1,348	1,350	1,348
Total assets	139,296	141,276	139,296	141,276
Expenditures for property	13	17	42	27
Depreciation and amortization	1,244	1,245	3,909	3,701
Impairment charges	0	0	0	0
Equity income (loss)	8	9	35	37
Corporate
Segment Reporting [Line Items]
Net sales and revenue	201	60	450	163
Adjustments	183	176	700	730
Equity in net assets of nonconsolidated affiliates	425	266	425	266
Goodwill and intangibles	0	0	0	0
Total assets	23,537	29,943	23,537	29,943
Expenditures for property	1	11	52	50
Depreciation and amortization	6	4	17	39
Impairment charges	0	0	0	0
Equity income (loss)	(39)	(16)	(121)	(30)
Eliminations
Segment Reporting [Line Items]
Net sales and revenue	(3)	(2)	(7)	(9)
Adjustments	0	0	0	4
Equity in net assets of nonconsolidated affiliates	0	0	0	0
Goodwill and intangibles	0	0	0	0
Total assets	(68,398)	(70,051)	(68,398)	(70,051)
Expenditures for property	0	0	0	0
Depreciation and amortization	0	0	0	0
Impairment charges	0	0	0	0
Equity income (loss)	0	0	0	0
Automotive
Segment Reporting [Line Items]
Automotive interest income	195	220	551	611
Automotive interest expense	(162)	(209)	(472)	(560)
Automotive \| Operating Segments
Segment Reporting [Line Items]
Net sales and revenue	45,706	44,256	128,817	126,985
Automotive \| Operating Segments \| GMNA
Segment Reporting [Line Items]
Net sales and revenue	41,419	40,551	117,732	117,424
Automotive \| Operating Segments \| GMI
Segment Reporting [Line Items]
Net sales and revenue	4,085	3,645	10,635	9,398
Automotive \| Corporate
Segment Reporting [Line Items]
Net sales and revenue	$ 201	$ 60	$ 450	$ 163

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.