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Subsequent Event (Details) - Subsequent Event [Member] job in Thousands, $ in Billions	Oct. 25, 2019 USD ($) job
Subsequent Event [Line Items]
Term of labor agreement	4 years
Number of jobs created or retained | job	9
Capital Addition Purchase Commitments [Member]
Subsequent Event [Line Items]
Additional manufacturing investments | $	$ 7.7

X

- Definition

Long-term Commitment, Labor Agreement, Number of Jobs Retained

+ References

No definition available.

+ Details

Name:	gm_LongtermCommitmentLaborAgreementNumberofJobsRetained
Namespace Prefix:	gm_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Long-term Commitment, Labor Agreement, Term

+ References

No definition available.

+ Details

Name:	gm_LongtermCommitmentLaborAgreementTerm
Namespace Prefix:	gm_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

+ References

No definition available.

+ Details

Name:	us-gaap_OtherCommitment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=us-gaap_CapitalAdditionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: