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Derivative Financial Instruments - Balance Sheet Location of GM Financial Unsecured Debt (Details) - GM Financial - Fair Value Hedges - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Derivatives, Fair Value [Line Items]
Carrying Amount of Hedged Items	$ 35,924	$ 36,664
Cumulative Amount of Fair Value Hedging Adjustments	759	1,281
Cumulative fair value adjustment on discontinued hedging relationships	594	719
Short-term unsecured debt
Derivatives, Fair Value [Line Items]
Carrying Amount of Hedged Items	4,663	6,406
Cumulative Amount of Fair Value Hedging Adjustments	37	(6)
Long-term unsecured debt
Derivatives, Fair Value [Line Items]
Carrying Amount of Hedged Items	31,261	30,258
Cumulative Amount of Fair Value Hedging Adjustments	$ 722	$ 1,287

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