Derivative Financial Instruments - Derivative Financial Instruments (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
DerivativeAssetStatementOfFinancialPositionExtensibleEnumerationNotDisclosedFlag	Fair Value of Assets	Fair Value of Assets
DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumerationNotDisclosedFlag	Fair Value of Liabilities	Fair Value of Liabilities
Automotive
Derivative [Line Items]
Notional	$ 13,283	$ 2,007
Fair Value of Assets	227	60
Fair Value of Liabilities	288	32
Automotive \| Designated as Hedges \| Fair Value Hedges \| Interest rate swaps(b) \| Fair Value Level 2
Derivative [Line Items]
Notional	4,405	670
Fair Value of Assets	13	38
Fair Value of Liabilities	61	4
Automotive \| Designated as Hedges \| Cash Flow Hedges \| Foreign exchange contracts \| Fair Value Level 2
Derivative [Line Items]
Notional	6,555	809
Fair Value of Assets	190	6
Fair Value of Liabilities	124	12
Automotive \| Designated as Hedges \| Cash Flow Hedges \| Commodity contracts \| Fair Value Level 2
Derivative [Line Items]
Notional	2,323	528
Fair Value of Assets	24	17
Fair Value of Liabilities	103	17
GM Financial
Derivative [Line Items]
Notional	169,727	163,446
Fair Value of Assets	981	1,809
Fair Value of Liabilities	2,427	2,563
Collateral	190	457
Collateral available for netting	1,200	1,200
GM Financial \| Fair Value Hedges \| Interest rate swaps(b)
Derivative [Line Items]
Loss on fair value hedges	(200)
GM Financial \| Cash Flow Hedges \| Foreign exchange contracts
Derivative [Line Items]
Gains (losses) recognized in AOCI	(375)	139	$ (529)
(Gains) losses reclassified from AOCI	422	(92)	$ 578
GM Financial \| Designated as Hedges \| Fair Value Hedges \| Interest rate swaps(b) \| Fair Value Level 2
Derivative [Line Items]
Notional	36,145	18,379
Fair Value of Assets	32	75
Fair Value of Liabilities	621	238
GM Financial \| Designated as Hedges \| Cash Flow Hedges \| Interest rate swaps(b) \| Fair Value Level 2
Derivative [Line Items]
Notional	1,873	2,381
Fair Value of Assets	35	17
Fair Value of Liabilities	4	16
GM Financial \| Designated as Hedges \| Cash Flow Hedges \| Foreign currency swaps \| Fair Value Level 2
Derivative [Line Items]
Notional	8,363	8,003
Fair Value of Assets	80	144
Fair Value of Liabilities	508	311
GM Financial \| Not Designated as Hedges \| Interest rate contracts \| Fair Value Level 2
Derivative [Line Items]
Notional	123,346	134,683
Fair Value of Assets	833	1,573
Fair Value of Liabilities	$ 1,294	$ 1,997

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