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Revenue - Narrative (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2018 USD ($)
Revenue from Contract with Customer [Abstract] |  |
Contract liabilities | $ 426 | $ 1,200
Deferred revenue expected to be recognized in the remainder of 2018 | 560 | 560
Deferred revenue expected to be recognized in 2019 | 1,000 | 1,000
Deferred revenue expected to be recognized in 2020 | 497 | 497
Deferred revenue expected to be recognized thereafter | $ 600 | $ 600

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- Definition Deferred Revenue, Due Thereafter + References No definition available. + Details
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Namespace Prefix: | gm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Deferred Revenue, Due in Remainder of Fiscal Year + References No definition available. + Details
Name: | gm_DeferredRevenueDueinRemainderofFiscalYear
Namespace Prefix: | gm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Deferred Revenue, Due in Year Three + References No definition available. + Details
Name: | gm_DeferredRevenueDueinYearThree
Namespace Prefix: | gm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Deferred Revenue, Due in Year Two + References No definition available. + Details
Name: | gm_DeferredRevenueDueinYearTwo
Namespace Prefix: | gm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of revenue recognized that was previously reported as deferred or unearned revenue. + References No definition available. + Details
Name: | us-gaap_DeferredRevenueRevenueRecognized1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration