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Supplementary Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended								6 Months Ended	9 Months Ended	12 Months Ended
	Oct. 31, 2017	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total net sales and revenue		$ 38,399	$ 35,791	$ 36,760	$ 36,099	$ 37,715	$ 33,623	$ 36,984	$ 37,266			$ 147,049	$ 145,588	$ 149,184
Income (loss) from continuing operations		2,069	2,530	2,366	1,110	(4,903)	114	2,433	2,686			8,075	330	9,269
Loss from discontinued operations, net of tax		0	0	0	70	277	3,096	770	69			70	4,212	1
Net income (loss) attributable to stockholders		$ 2,044	$ 2,534	$ 2,390	$ 1,046	$ (5,151)	$ (2,981)	$ 1,660	$ 2,608			$ 8,014	$ (3,864)	$ 9,427
Basic earnings (loss) per common share – continuing operations (in dollars per share)		$ 1.42	$ 1.77	$ 1.68	$ 0.78	$ (3.46)	$ 0.08	$ 1.62	$ 1.78			$ 5.66	$ 0.23	$ 6.12
Basic loss per common share – discontinued operations (in dollars per share)		(0.00)	(0.00)	(0.00)	0.05	0.19	2.14	0.51	0.05			0.05	2.88	(0.00)
Diluted earnings (loss) per common share – continuing operations (in dollars per share)		1.40	1.75	1.66	0.77	(3.46)	0.08	1.60	1.75			5.58	0.22	6.00
Diluted loss per common share – discontinued operations (in dollars per share)		$ (0.00)	$ (0.00)	$ (0.00)	$ 0.05	$ 0.19	$ 2.11	$ 0.51	$ 0.05			$ 0.05	$ 2.82	$ (0.00)
Non-recurring tax benefit												$ 134	$ (7,194)	$ (147)
Tax expense related to tax reform legislation						$ 7,300							$ 7,300
Automotive [Member]
Segment Reporting Information [Line Items]
Automotive and other gross margin(a)		$ 2,935	$ 3,743	$ 3,204	$ 2,507	$ 4,385	$ 3,614	$ 4,463	$ 4,758
Discontinued Operations [Member] | Opel/Vauxhall Business [Member]
Segment Reporting Information [Line Items]
Loss from discontinued operations, net of tax											$ 3,900
Charge at closing											6,200
Income tax expense	$ 2,300										$ 2,300
Facility closing [Member] | Korea [Member]
Segment Reporting Information [Line Items]
Restructuring charges and other charges										$ 1,100
Ignition Switch Recall Litigations [Member]
Segment Reporting Information [Line Items]
Ignition switch related legal matters			$ 440
Transformation Activities [Member]
Segment Reporting Information [Line Items]
Restructuring charges and other charges		1,300
Foreign Tax Authority [Member]
Segment Reporting Information [Line Items]
Non-recurring tax benefit		$ 1,000

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_SegmentReportingInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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- Details

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Balance Type:
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- Details

Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=gm_OpelVauxhallBusinessMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_RestructuringPlanAxis=us-gaap_FacilityClosingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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- Details

Name:	srt_StatementGeographicalAxis=country_KR
Namespace Prefix:
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Balance Type:
Period Type:

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- Details

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Balance Type:
Period Type:

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- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=gm_TransformationActivitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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- Details

Name:	us-gaap_IncomeTaxAuthorityAxis=us-gaap_ForeignCountryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: