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Subsequent Event Voluntary Separation Program (Details) - Subsequent Event [Member] $ in Millions | Oct. 31, 2018 USD ($) employee
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Subsequent Event [Line Items] |
Approximate Number of Eligible Employees | 18,000
The Expected Charge for Every 1800 Employees | $ | $ 130
Number of Voluntarily Separated Employees for which a Charge of $130 million is Expected | 1,800
Approximate Percentage of Voluntary Separated Employees for which a Charge of $130 Million is Expected | 10.00%

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- Definition Approximate Number of Eligible Employees for the voluntary program + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Approximate Percentage of Voluntary Separated Employees for which a Charge of $130 Million is Expected + References No definition available. + Details
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Namespace Prefix: | gm_
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Period Type: | instant

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- Definition Number of Voluntarily Separated Employees for which a Charge of $130 million is Expected + References No definition available. + Details
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- Definition The Expected Charge for Every 1800 Employees + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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
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Namespace Prefix: | us-gaap_
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |