Debt - Automotive and GM Financial Debt (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
Mar. 31, 2024	Dec. 31, 2024	Dec. 31, 2023
Automotive
Debt Instrument [Line Items]
Finance lease liabilities		$ 383	$ 437
Carrying Amount		15,467	16,413
Finance lease liabilities, Fair Value		391	447
Fair Value		15,204	16,490
Available under credit facility agreements		$ 13,793	$ 16,446
Weighted-average interest rate on outstanding short-term debt		7.30%	16.20%
Weighted-average interest rate on outstanding long-term debt		5.80%	5.80%
Net discount and debt issuance costs		$ 439	$ 527
Automotive \| Secured Debt
Debt Instrument [Line Items]
Total debt		105	134
Fair Value		105	132
Automotive \| Unsecured Debt
Debt Instrument [Line Items]
Total debt		14,980	15,842
Fair Value		14,709	15,911
Automotive \| Level 1
Debt Instrument [Line Items]
Fair Value		14,366	15,457
Automotive \| Level 2
Debt Instrument [Line Items]
Fair Value		838	1,033
GM Financial
Debt Instrument [Line Items]
Total debt		114,264	105,327
Fair Value		115,010	104,622
GM Financial \| Secured Debt
Debt Instrument [Line Items]
Total debt		49,573	45,243
Fair Value		49,753	44,971
GM Financial \| Unsecured Debt
Debt Instrument [Line Items]
Total debt		64,691	60,084
Fair Value		$ 65,258	59,651
GM Financial \| Unsecured Debt \| Line of Credit \| $2.0 Billion Dollar Revolving Credit Facility
Debt Instrument [Line Items]
Debt term	364 days	364 days
Aggregate borrowing capacity	$ 2,000	$ 2,000
GM Financial \| Level 2
Debt Instrument [Line Items]
Fair Value		112,941	102,262
GM Financial \| Level 3
Debt Instrument [Line Items]
Fair Value		$ 2,070	$ 2,360

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