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Product Warranty and Related Liabilities Product Warranty and Related Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Product Warranty and Related Liabilities [Roll Forward]
Warranty balance at beginning of period	$ 9,366	$ 9,296	$ 9,279	$ 9,646
Warranties issued and assumed in period - recall campaigns and courtesy transportation	324	299	698	685
Warranties issued and assumed in period - policy and product warranty	671	576	1,883	1,742
Payments	(947)	(939)	(2,782)	(3,045)
Adjustments to pre-existing warranties	95	132	384	461
Effect of foreign currency and other	6	(111)	53	(236)
Warranty balance at end of period	$ 9,515	$ 9,253	$ 9,515	$ 9,253

X

- Definition

Amount as of the balance sheet date of the aggregate standard product warranty and related liabilities. Does not include the balance for the extended product warranty liability.

+ References

No definition available.

+ Details

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

X

- Definition

Increase or Decrease in standard product warranty liability and related liabilities due to currency translation and other. Does not include any Increase or Decrease in an extended product warranty liability due to currency translation.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the aggregate decrease in the liability for payments made (in cash or in kind) to satisfy claims under the terms of the standard product warranty or related liabilities. Does not include any Increase or Decrease in the liability for payments related to extended product warranties.

+ References

No definition available.

+ Details

Name:	gm_PolicyproductwarrantyrecallcampaignsandcourtesytransportationPayments
Namespace Prefix:	gm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the aggregate Increase or Decrease in the liability during the reporting period for accruals related to preexisting standard product warranties (including adjustments related to changes in estimates) and related liabilities. Does not include any Increase or Decrease in the liability for accruals related to extended product warranties.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the aggregate increase in the liability for accruals related to standard policy and warranty issued during the reporting period. Does not include any increase in the liability for accruals related to extended product warranties.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the aggregate increase in the liability for accruals for recall campaigns, courtesy transportation and related liabilities issued during the reporting period.

+ References

No definition available.

+ Details

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

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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