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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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Debt - Secured Debt and Unsecured Debt (Details) - USD ($) $ in Millions	1 Months Ended			12 Months Ended
	Jan. 31, 2023	Dec. 31, 2022	Apr. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Aug. 31, 2022
Unsecured Debt \| GMI
Debt Instrument [Line Items]
Repayments of debt				$ 529
Automotive
Debt Instrument [Line Items]
Weighted-average interest rate on outstanding long-term debt		5.80%		5.80%	5.80%
Revolving Credit Facility \| GM Financial \| Unsecured Debt
Debt Instrument [Line Items]
Weighted-average interest rate		6.97%		6.97%
Maximum \| Revolving Credit Facility \| GM Financial \| Unsecured Debt
Debt Instrument [Line Items]
Debt term				5 years
Line of Credit \| GM Financial \| Unsecured Debt \| $2.0 Billion Dollar Revolving Credit Facility
Debt Instrument [Line Items]
Debt term			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				$ 26,300
Senior Notes \| Unsecured Debt
Debt Instrument [Line Items]
Weighted-average interest rate						5.51%
Amount of debt issued						$ 2,250
Senior Notes \| Unsecured Debt \| 5.40% Senior Unsecured Notes Maturing October 2023
Debt Instrument [Line Items]
Repayments of debt		$ 1,000
Stated interest rate		5.40%		5.40%
Senior Notes \| Unsecured Debt \| 4.875% Senior Unsecured Notes Maturing October 2023 \| Subsequent Event
Debt Instrument [Line Items]
Repayments of debt	$ 1,500
Stated interest rate	4.875%
Senior Notes \| GM Financial \| 5.2% Senior Notes Due March 2023
Debt Instrument [Line Items]
Amount of debt issued					$ 1,500
Stated interest rate					5.20%
Loss on the early extinguishment of debt					$ 105
Senior Notes \| GM Financial \| Unsecured Debt
Debt Instrument [Line Items]
Weighted-average interest rate		3.78%		3.78%
Amount of debt issued		$ 9,000		$ 9,000
Weighted-average interest rate on outstanding long-term debt		3.20%		3.20%
Notes Payable, Other Payables \| GM Financial \| Secured Debt \| Securitization notes payable
Debt Instrument [Line Items]
Weighted-average interest rate		3.40%		3.40%
Amount of debt issued		$ 24,300		$ 24,300
Weighted-average interest rate on outstanding long-term debt		1.70%		1.70%