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Debt - Narrative (Details) - USD ($)	1 Months Ended		3 Months Ended	9 Months Ended
	Sep. 30, 2021	Apr. 30, 2021	Sep. 30, 2021	Sep. 30, 2021	Oct. 27, 2021	Mar. 31, 2021
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		$ 4,000,000,000	$ 4,000,000,000
Unsecured Debt | Senior Notes
Debt Instrument [Line Items]
Repayments of debt	450,000,000
GM Financial | Line of Credit
Debt Instrument [Line Items]
Aggregate borrowing capacity	21,900,000,000		21,900,000,000	21,900,000,000
GM Financial | Senior Notes | Subsequent Event
Debt Instrument [Line Items]
Principal amount					$ 2,300,000,000
Weighted average interest rate (percent)					1.63%
GM Financial | Senior Notes | 5.2% Senior Notes Due March 2023
Debt Instrument [Line Items]
Principal amount	$ 1,500,000,000		$ 1,500,000,000	$ 1,500,000,000
Stated interest rate	5.20%		5.20%	5.20%
Loss on extinguishment of debt	$ 105,000,000
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	$ 2,000,000,000	$ 2,000,000,000	$ 2,000,000,000
GM Financial | Unsecured Debt | Senior Notes
Debt Instrument [Line Items]
Principal amount	$ 9,900,000,000		$ 9,900,000,000	$ 9,900,000,000
Weighted average interest rate (percent)	1.57%		1.57%	1.57%
GM Financial | Secured Debt | Notes Payable, Other Payables | Securitization notes payable
Debt Instrument [Line Items]
Principal amount	$ 19,300,000,000		$ 19,300,000,000	$ 19,300,000,000
Weighted average interest rate (percent)	0.73%		0.73%	0.73%

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