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Debt - Secured Debt and Unsecured Debt (Details) $ in Millions, $ in Millions	1 Months Ended				12 Months Ended
	Aug. 31, 2020 USD ($)	May 31, 2020 USD ($)	Apr. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Jan. 31, 2021 USD ($)	Jan. 31, 2021 CAD ($)	Dec. 31, 2019
Automotive
Debt Instrument [Line Items]
Weighted-average interest rate on outstanding long-term debt					5.60%			5.40%
Revolving Credit Facility | GM Financial | Unsecured Debt
Debt Instrument [Line Items]
Weighted-average interest rate					2.47%
Maximum | Revolving Credit Facility | GM Financial | Unsecured Debt
Debt Instrument [Line Items]
Debt term					4 years
Line of Credit | Unsecured Debt
Debt Instrument [Line Items]
Proceeds borrowed				$ 2,000
Debt term		3 years	3 years
Aggregate borrowing capacity		$ 2,000	$ 3,000
Dividend restriction covenant, amount outstanding					$ 5,000
Line of Credit | Unsecured Debt | Three Year Revolving Credit Facility April 2021
Debt Instrument [Line Items]
Proceeds borrowed				3,400
Debt term			3 years		3 years
Aggregate borrowing capacity			$ 4,000		$ 4,000
Line of Credit | Unsecured Debt | Five Year Revolving Credit Facility Due 2023
Debt Instrument [Line Items]
Proceeds borrowed				$ 10,500
Debt term					5 years
Aggregate borrowing capacity					$ 10,500
Line of Credit | Unsecured Debt | Three Year Revolving Credit Facility April 2022
Debt Instrument [Line Items]
Aggregate borrowing capacity			$ 3,600
Line of Credit | GM Financial | Unsecured Debt | Two Billion Dollar Revolving Credit Facility
Debt Instrument [Line Items]
Debt term		364 days	364 days		364 days
Aggregate borrowing capacity		$ 2,000	$ 2,000		$ 2,000
Line of Credit | Revolving Credit Facility | GM Financial | Secured Debt
Debt Instrument [Line Items]
Increase to maximum borrowing capacity					21,100
Senior Notes | Unsecured Debt
Debt Instrument [Line Items]
Amount of debt issued		$ 4,000
Weighted-average interest rate		6.11%
Senior Notes | Unsecured Debt | Floating Rate Notes
Debt Instrument [Line Items]
Repayments of debt	$ 500
Senior Notes | GM Financial | Senior Notes Due 2031 | Subsequent Event
Debt Instrument [Line Items]
Amount of debt issued						$ 2,500
Weighted-average interest rate						1.69%	1.69%
Senior Notes | GM Financial | CAD Senior Notes Due 2026 | Subsequent Event
Debt Instrument [Line Items]
Amount of debt issued							$ 500
Weighted-average interest rate						1.75%	1.75%
Senior Notes | GM Financial | Unsecured Debt
Debt Instrument [Line Items]
Amount of debt issued					$ 9,200
Weighted-average interest rate					2.93%
Weighted-average interest rate on outstanding long-term debt					3.25%
Notes Payable, Other Payables | GM Financial | Secured Debt | Securitization notes payable
Debt Instrument [Line Items]
Amount of debt issued					$ 24,600
Weighted-average interest rate					1.17%
Weighted-average interest rate on outstanding long-term debt					1.89%

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