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Automotive and GM Financial Debt Secured Debt (Details) - GM Financial [Member] - Secured Debt [Member] $ in Billions	12 Months Ended
	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Weighted-average interest rate	2.09%
Securitization notes payable [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date Range, Start	Dec. 31, 2018
Debt Instrument, Maturity Date Range, End	Dec. 31, 2024
Securitization Notes Payable Issued	$ 16.9
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line Of Credit Increase Maximum Borrowing Capacity	$ 4.0
Maximum [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Term	6 years

X

- Definition

New debt issued during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	gm_
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Balance Type:	credit
Period Type:	duration

X

- Definition

The increase in the maximum borrowing capacity of the facility during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	gm_
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Balance Type:	debit
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X

- Definition

Latest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Earliest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Balance Type:	na
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- Definition

Weighted average interest rate of debt outstanding.

+ References

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+ Details

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Balance Type:	na
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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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- Details

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- Details

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- Details

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- Details

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- Details

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