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Automotive and GM Financial Debt Narrative (Details) - GM Financial [Member] $ in Millions	6 Months Ended
	Jun. 30, 2017 USD ($)
Secured Debt [Member] | Securitization Notes Payable [Member] | Securitization notes payable [Member]
Debt Instrument [Line Items]
Principal amount	$ 9,300
Weighted average interest rate (percent)	2.04%
Secured Debt [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facilities entered, total net additional borrowing capacity	$ 1,900
Unsecured Debt [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Principal amount	$ 10,000
Weighted average interest rate (percent)	2.90%

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

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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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- Definition

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