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Debt - Narrative (Details) $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended
	Apr. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Jul. 31, 2021 CAD ($)	Mar. 31, 2021 USD ($)
Unsecured Debt | Line of Credit
Debt Instrument [Line Items]
Aggregate borrowing capacity	$ 11,200,000,000
Unsecured Debt | Line of Credit | Five Year Revolving Credit Facility Due 2023
Debt Instrument [Line Items]
Debt term	5 years	5 years
Aggregate borrowing capacity					$ 10,500,000,000
Unsecured Debt | Line of Credit | Five Year Revolving Credit Facility Due 2026
Debt Instrument [Line Items]
Debt term	5 years
Aggregate borrowing capacity	$ 9,900,000,000
Line of credit extension period	3 years
Unsecured Debt | Line of Credit | Three Year Revolving Credit Facility April 2024
Debt Instrument [Line Items]
Debt term	3 years
Aggregate borrowing capacity	$ 4,300,000,000
Unsecured Debt | Line of Credit | Three Year Revolving Credit Facility April 2021
Debt Instrument [Line Items]
Debt term			3 years
Aggregate borrowing capacity		$ 4,000,000,000.0	$ 4,000,000,000.0
GM Financial | Line of Credit
Debt Instrument [Line Items]
Aggregate borrowing capacity		$ 18,700,000,000	$ 18,700,000,000
GM Financial | Senior Notes | Subsequent Event
Debt Instrument [Line Items]
Principal amount				$ 400
Stated interest rate				1.70%
GM Financial | Unsecured Debt | Line of Credit | $2.0 Billion Dollar Revolving Credit Facility
Debt Instrument [Line Items]
Debt term	364 days	364 days	364 days
Aggregate borrowing capacity	$ 2,000,000,000.0	$ 2,000,000,000.0	$ 2,000,000,000.0
GM Financial | Unsecured Debt | Senior Notes
Debt Instrument [Line Items]
Principal amount		$ 8,300,000,000	$ 8,300,000,000
Weighted average interest rate (percent)		1.65%	1.65%
GM Financial | Secured Debt | Notes Payable, Other Payables | Securitization notes payable
Debt Instrument [Line Items]
Principal amount		$ 13,400,000,000	$ 13,400,000,000
Weighted average interest rate (percent)		0.75%	0.75%

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