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Automotive and GM Financial Debt Secured Debt and Unsecured Debt (Details) € in Millions, $ in Millions	1 Months Ended			12 Months Ended
	Jan. 31, 2019 USD ($)	Oct. 31, 2018 USD ($)	Apr. 30, 2018 USD ($) credit_faciliy	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jul. 31, 2020 USD ($)	Jan. 31, 2019 EUR (€)	Sep. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)
Debt Instrument [Line Items]
Number of renewed credit facilities | credit_faciliy			2
Number of new credit facilities | credit_faciliy			1
Debt repayment		$ 1,500
Automotive [Member]
Debt Instrument [Line Items]
Weighted-average interest rate on outstanding long-term debt				5.20%	5.20%
Revolving Credit Facility [Member] | GM Financial [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Weighted-average interest rate				5.98%
Maximum [Member] | Revolving Credit Facility [Member] | GM Financial [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt term				4 years
Line of Credit [Member]
Debt Instrument [Line Items]
Aggregate borrowing capacity			$ 16,500							$ 14,500
Line of Credit [Member] | Subsequent Event [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Aggregate borrowing capacity	$ 3,000
Line of Credit [Member] | Three-Year Revolving Credit Facility January 2019 [Member] | Subsequent Event [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt term	3 years
Line of Credit [Member] | Revolving Credit Facility [Member] | GM Financial [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Increase to maximum borrowing capacity				$ 695
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
Senior Notes [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Amount of debt issued									$ 2,100
Weighted-average interest rate									5.03%
Senior Notes [Member] | GM Financial [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Amount of debt issued				$ 8,600
Weighted-average interest rate				3.36%
Weighted-average interest rate on outstanding long-term debt				3.40%
Senior Notes [Member] | GM Financial [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Amount of debt issued	$ 2,500
Weighted-average interest rate	5.03%							5.03%
Notes Payable, Other Payables [Member] | GM Financial [Member] | Secured Debt [Member] | Securitization notes payable [Member]
Debt Instrument [Line Items]
Amount of debt issued				$ 22,800
Weighted-average interest rate				3.00%
Weighted-average interest rate on outstanding long-term debt				2.85%
Medium-term Notes [Member] | GM Financial [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Amount of debt issued | €								€ 850
Weighted-average interest rate	2.20%							2.20%
U.S. [Member] | Commercial Paper [Member] | GM Financial [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Unsecured commercial paper				$ 1,200
Line of Credit [Member] | $2.0 Billion Revolving Credit Facility [Member] | GM Financial [Member]
Debt Instrument [Line Items]
Aggregate borrowing capacity			$ 2,000
Debt term			364 days
Pension Plan [Member]
Debt Instrument [Line Items]
Employer contributions				1,700	$ 1,230	$ 3,076
Pension Plan [Member] | Non-U.S. [Member]
Debt Instrument [Line Items]
Employer contributions				1,624	$ 1,153	$ 1,022
Pension Plan [Member] | Non-U.S. [Member] | United Kingdom and Canada [Member]
Debt Instrument [Line Items]
Employer contributions				$ 584
Forecast [Member] | Line of Credit [Member] | Three-Year Revolving Credit Facility January 2019 [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Aggregate borrowing capacity							$ 2,000

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