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Debt - Secured Debt and Unsecured Debt (Details) - USD ($)	1 Months Ended		12 Months Ended
	Apr. 30, 2019	Jan. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jul. 31, 2020	Jan. 31, 2020
Debt Instrument [Line Items]
Finance lease assets			$ 327,000,000
Finance lease costs			170,000,000
Finance lease right of use assets obtained in exchange for lease obligations			196,000,000
Finance lease payments for 2020			129,000,000
Finance lease payments for years 2021 to 2024			156,000,000
Finance lease payments thereafter			354,000,000
Imputed interest			$ 329,000,000
Weighted-average discount rate on finance leases			10.90%
Weighted-average remaining lease term			13 years 8 months 12 days
Payments for finance leases			$ 183,000,000
Proceeds from issuance of debt (original maturities greater than three months)			$ 36,937,000,000	$ 43,801,000,000	$ 52,187,000,000
Automotive
Debt Instrument [Line Items]
Weighted-average interest rate on outstanding long-term debt			5.40%	5.20%
Revolving Credit Facility | GM Financial | Unsecured Debt
Debt Instrument [Line Items]
Weighted-average interest rate			4.73%
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]
Aggregate borrowing capacity		$ 3,000,000,000.0
Proceeds from issuance of debt (original maturities greater than three months)			$ 700,000,000
Line of Credit | GM Financial | Unsecured Debt
Debt Instrument [Line Items]
Aggregate borrowing capacity	$ 2,000,000,000.0
Debt term	364 days
Debt renewal term	364 days
Line of Credit | Three-Year Revolving Credit Facility January 2019 | Unsecured Debt
Debt Instrument [Line Items]
Debt term		3 years
Line of Credit | Revolving Credit Facility | GM Financial | Secured Debt
Debt Instrument [Line Items]
Increase to maximum borrowing capacity			225,000,000
Senior Notes | GM Financial | Unsecured Debt
Debt Instrument [Line Items]
Amount of debt issued			$ 6,900,000,000
Weighted-average interest rate			3.63%
Weighted-average interest rate on outstanding long-term debt			3.42%
Senior Notes | GM Financial | Subsequent Event
Debt Instrument [Line Items]
Amount of debt issued							$ 1,250,000,000
Stated interest rate							2.90%
Notes Payable, Other Payables | GM Financial | Secured Debt | Securitization notes payable
Debt Instrument [Line Items]
Amount of debt issued			$ 16,200,000,000
Weighted-average interest rate			2.75%
Weighted-average interest rate on outstanding long-term debt			2.95%
Forecast | Line of Credit | Three-Year Revolving Credit Facility January 2019 | Unsecured Debt
Debt Instrument [Line Items]
Aggregate borrowing capacity						$ 2,000,000,000.0

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