Derivative Financial Instruments - Balance Sheet Location of GM Financial Unsecured Debt (Details) - Fair Value Hedges - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Automotive
Derivatives, Fair Value [Line Items]
Carrying Amount of Hedged Items	$ 5,825	$ 4,405
Cumulative Amount of Fair Value Hedging Adjustments	(95)	48
GM Financial
Derivatives, Fair Value [Line Items]
Carrying Amount of Hedged Items	35,187	36,664
Cumulative Amount of Fair Value Hedging Adjustments	693	1,281
Cumulative fair value adjustment on discontinued hedging relationships	428	719
Short-term Unsecured Debt \| Automotive
Derivatives, Fair Value [Line Items]
Carrying Amount of Hedged Items	0	0
Cumulative Amount of Fair Value Hedging Adjustments	0	0
Short-term Unsecured Debt \| GM Financial
Derivatives, Fair Value [Line Items]
Carrying Amount of Hedged Items	4,633	6,406
Cumulative Amount of Fair Value Hedging Adjustments	17	(6)
Long-term Unsecured Debt \| Automotive
Derivatives, Fair Value [Line Items]
Carrying Amount of Hedged Items	5,825	4,405
Cumulative Amount of Fair Value Hedging Adjustments	(95)	48
Long-term Unsecured Debt \| GM Financial
Derivatives, Fair Value [Line Items]
Carrying Amount of Hedged Items	30,554	30,258
Cumulative Amount of Fair Value Hedging Adjustments	$ 676	$ 1,287

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