Derivative Financial Instruments - Notional Amounts for Derivative Financial Instruments (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Derivative [Line Items]
Fair value of assets (liabilities) available for offset	$ 693		$ 693
GM Financial
Derivative [Line Items]
Notional	172,490		169,727
Fair Value of Assets	870		981
Fair Value of Liabilities	1,715		2,427
Collateral	104		190
Collateral available for netting	898		1,200
GM Financial \| Interest rate swaps \| Fair Value Hedges \| Fair Value Level 2 \| Designated as Hedges
Derivative [Line Items]
Notional	44,495		36,145
Fair Value of Assets	127		32
Fair Value of Liabilities	589		621
GM Financial \| Interest rate swaps \| Cash Flow Hedges \| Fair Value Level 2 \| Designated as Hedges
Derivative [Line Items]
Notional	2,006		1,873
Fair Value of Assets	28		35
Fair Value of Liabilities	17		4
GM Financial \| Foreign currency swaps \| Cash Flow Hedges
Derivative [Line Items]
Gain (loss) recognized in AOCI	157	$ (141)
(Gains) losses reclassified from AOCI	(231)	$ 163
GM Financial \| Foreign currency swaps \| Cash Flow Hedges \| Fair Value Level 2 \| Designated as Hedges
Derivative [Line Items]
Notional	8,420		8,363
Fair Value of Assets	137		80
Fair Value of Liabilities	231		508
GM Financial \| Interest rate contracts \| Fair Value Level 2 \| Not Designated as Hedges
Derivative [Line Items]
Notional	117,569		123,346
Fair Value of Assets	578		833
Fair Value of Liabilities	$ 879		$ 1,294

Derivative Assets (Liabilities) Net Fair Value Amount Not Offset Against Collateral

No definition available.

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