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Debt - Debt Carrying Amount and Fair Value (Details) - USD ($) $ in Millions	1 Months Ended	6 Months Ended
	Mar. 31, 2025	Jun. 30, 2025	Dec. 31, 2024
Automotive
Debt Instrument [Line Items]
Finance lease liabilities		$ 391	$ 383
Finance lease liabilities, Fair Value		393	391
Carrying Amount		17,199	15,467
Fair Value		16,767	15,204
Available under credit facility agreements		$ 13,832	$ 13,793
Weighted-average interest rate on outstanding short-term debt		8.90%	7.30%
Weighted-average interest rate on outstanding long-term debt		5.90%	5.80%
Net discount and debt issuance costs		$ 472	$ 439
Automotive | Level 1
Debt Instrument [Line Items]
Fair Value		15,922	14,366
Automotive | Level 2
Debt Instrument [Line Items]
Fair Value		845	838
GM Financial
Debt Instrument [Line Items]
Carrying Amount		118,532	114,264
Fair Value		119,516	115,010
GM Financial | Level 2
Debt Instrument [Line Items]
Fair Value		117,071	112,941
GM Financial | Level 3
Debt Instrument [Line Items]
Fair Value		2,445	2,070
Secured Debt | Automotive
Debt Instrument [Line Items]
Carrying Amount		107	105
Fair Value		107	105
Secured Debt | GM Financial
Debt Instrument [Line Items]
Carrying Amount		50,913	49,573
Fair Value		51,204	49,753
Unsecured Debt | Automotive
Debt Instrument [Line Items]
Carrying Amount		16,701	14,980
Fair Value		16,267	14,709
Unsecured Debt | GM Financial
Debt Instrument [Line Items]
Carrying Amount		67,620	64,691
Fair Value		$ 68,312	$ 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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