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Debt - Debt Carrying Amount and Fair Value (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
	Mar. 31, 2025	Sep. 30, 2025	Dec. 31, 2024
Automotive
Debt Instrument [Line Items]
Finance lease liabilities		$ 555	$ 383
Finance lease liabilities, Fair Value		552	391
Carrying Amount		16,114	15,467
Fair Value		16,010	15,204
Available under credit facility agreements		$ 13,938	$ 13,793
Weighted-average interest rate on outstanding short-term debt		7.90%	7.30%
Weighted-average interest rate on outstanding long-term debt		5.80%	5.80%
Net discount and debt issuance costs		$ 454	$ 439
Automotive | Level 1
Debt Instrument [Line Items]
Fair Value		15,019	14,366
Automotive | Level 2
Debt Instrument [Line Items]
Fair Value		990	838
GM Financial
Debt Instrument [Line Items]
Carrying Amount		116,389	114,264
Fair Value		117,945	115,010
GM Financial | Level 2
Debt Instrument [Line Items]
Fair Value		115,371	112,941
GM Financial | Level 3
Debt Instrument [Line Items]
Fair Value		2,575	2,070
Secured Debt | Automotive
Debt Instrument [Line Items]
Carrying Amount		99	105
Fair Value		99	105
Secured Debt | GM Financial
Debt Instrument [Line Items]
Carrying Amount		49,394	49,573
Fair Value		49,733	49,753
Unsecured Debt | Automotive
Debt Instrument [Line Items]
Carrying Amount		15,461	14,980
Fair Value		15,359	14,709
Unsecured Debt | GM Financial
Debt Instrument [Line Items]
Carrying Amount		66,994	64,691
Fair Value		$ 68,212	$ 65,258
Unsecured Debt | GM Financial | $2.0 Billion Dollar Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Debt term	364 days	364 days
Aggregate borrowing capacity	$ 2,000	$ 2,000

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