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Automotive and GM Financial Debt Narrative (Details) $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended
	Apr. 30, 2018 USD ($) credit_faciliy	Jun. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)
Debt Instrument [Line Items]
Number of renewed credit facilities | credit_faciliy	2
Number of new credit facilities | credit_faciliy	1
Estimate of Fair Value Measurement [Member]
Debt Instrument [Line Items]
Debt term			18 months
Line of Credit [Member]
Debt Instrument [Line Items]
Aggregate borrowing capacity	$ 16,500			$ 14,500
Line of Credit [Member] | Three Year Revolving Credit Facility April 2018 [Member]
Debt Instrument [Line Items]
Aggregate borrowing capacity	$ 4,000
Debt term	3 years
Line of Credit [Member] | Letter of Credit [Member]
Debt Instrument [Line Items]
Aggregate borrowing capacity	$ 1,100
Line of Credit [Member] | Five-Year Revolving Credit Facility April 2018 [Member]
Debt Instrument [Line Items]
Aggregate borrowing capacity	$ 10,500
Debt term	5 years
Automotive [Member]
Debt Instrument [Line Items]
Dividends received		$ 2,000
GM Financial [Member] | Line of Credit [Member] | $2.0 Billion Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Aggregate borrowing capacity	$ 2,000
Debt term	364 days
GM Financial [Member] | Secured Debt [Member] | Line of Credit [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total net additional borrowing capacity			$ 161
GM Financial [Member] | Secured Debt [Member] | Notes Payable, Other Payables [Member] | Securitization notes payable [Member]
Debt Instrument [Line Items]
Principal amount		$ 10,300	$ 10,300
Weighted average interest rate (percent)		2.81%	2.81%
GM Financial [Member] | Unsecured Debt [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Principal amount		$ 7,000	$ 7,000
Weighted average interest rate (percent)		3.12%	3.12%
SGM [Member] | Automotive [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Principal amount				$ 1,300

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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

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-Topic 235
-SubTopic 10
-Section S99
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