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Automotive and GM Financial Debt Narrative (Details) $ in Billions	1 Months Ended	3 Months Ended
	Apr. 26, 2018 USD ($) credit_faciliy	Mar. 31, 2018 USD ($)
Subsequent Event [Member]
Debt Instrument [Line Items]
Number of renewed credit facilities | credit_faciliy	2
Estimate of Fair Value Measurement [Member]
Debt Instrument [Line Items]
Debt term		18 months
Line of Credit [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Aggregate borrowing capacity	$ 16.5
Line of Credit [Member] | Three Year Revolving Credit Facility April 2018 [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Aggregate borrowing capacity	$ 4.0
Debt term	3 years
Line of Credit [Member] | Letter of Credit [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Aggregate borrowing capacity	$ 1.1
Line of Credit [Member] | Five-Year Revolving Credit Facility April 2018 [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Aggregate borrowing capacity	$ 10.5
Debt term	5 years
Automotive [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Number of new credit facilities | credit_faciliy	1
Automotive [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Aggregate borrowing capacity		$ 14.5
GM Financial [Member] | Line of Credit [Member] | $2.0 Billion Revolving Credit Facility [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Aggregate borrowing capacity	$ 2.0
Debt term	364 days
GM Financial [Member] | Secured Debt [Member] | Notes Payable, Other Payables [Member] | Securitization notes payable [Member]
Debt Instrument [Line Items]
Principal amount		$ 4.7
Weighted average interest rate (percent)		2.59%
GM Financial [Member] | Unsecured Debt [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Principal amount		$ 3.4
Weighted average interest rate (percent)		2.30%
GM Financial [Member] | Unsecured Debt [Member] | Senior Notes [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Principal amount	$ 2.5
Weighted average interest rate (percent)	3.80%
SGM [Member] | Automotive [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Principal amount		$ 1.3

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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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.

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- Definition

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+ 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 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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