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Derivative Financial Instruments Balance Sheet Location of Cumulative Basis Adjustments (Details) - Fair Value Hedges [Member] - Long-term Debt [Member] - GM Financial [Member] $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($)
Derivatives, Fair Value [Line Items]
Carrying Amount of Hedged Items	$ 15,363
Cumulative Amount of Fair Value Hedging Adjustments on Hedging Relationships	735
Cumulative fair value adjustment on discontinued hedging relationships	$ 178

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- Definition

Derivative Liabilities, Fair Value Adjustment

+ References

No definition available.

+ Details

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Namespace Prefix:	gm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Definition

Derivative Liabilities, Fair Value Adjustment on Discontinued Hedging Relationships

+ References

No definition available.

+ Details

Name:	gm_DerivativeLiabilitiesFairValueAdjustmentonDiscontinuedHedgingRelationships
Namespace Prefix:	gm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Definition

Derivative Liability, Less Par Value

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No definition available.

+ Details

Name:	gm_DerivativeLiabilityLessParValue
Namespace Prefix:	gm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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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

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Data Type:	xbrli:stringItemType
Balance Type:	na
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- Details

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- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_LongTermDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	gm_BusinessGroupAxis=gm_GmFinancialMember
Namespace Prefix:
Data Type:	na
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Period Type: