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Equity In Net Assets Of Nonconsolidated Affiliates (Details) vehicle in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) vehicle numberOfJointVenture	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Schedule of Equity Method Investments [Line Items]
Equity income (loss)(c)	$ (3,701)	$ 773	$ 837
Equity in net assets of nonconsolidated affiliates	7,102	10,613	10,176
Basis Difference	$ 1,900	4,200
Number of joint ventures engaged in production, import and sale of products | numberOfJointVenture	4
Equity loss	$ (4,675)	480	837
SGM
Schedule of Equity Method Investments [Line Items]
Number of interests in other joint ventures | numberOfJointVenture	3
Automotive China
Schedule of Equity Method Investments [Line Items]
Equity income (loss)(c)	$ (4,407)	446	677
Equity in net assets of nonconsolidated affiliates	1,474	6,373
Ultium Cells Holdings LLC
Schedule of Equity Method Investments [Line Items]
Equity income (loss)(c)	975	293	8
Equity in net assets of nonconsolidated affiliates	3,749	2,268
Other joint ventures
Schedule of Equity Method Investments [Line Items]
Equity income (loss)(c)	(268)	34	$ 151
Equity in net assets of nonconsolidated affiliates	$ 1,879	$ 1,972
SGM
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%	50.00%
SGM | SAIC
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%
PATAC
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%	50.00%
SGMS
Schedule of Equity Method Investments [Line Items]
Ownership percentage	49.00%	49.00%
SGMW
Schedule of Equity Method Investments [Line Items]
Ownership percentage	44.00%	44.00%
Shanghai OnStar
Schedule of Equity Method Investments [Line Items]
Ownership percentage	40.00%	40.00%
Shanghai OnStar | SGM
Schedule of Equity Method Investments [Line Items]
Ownership percentage	20.00%
SGM Norsom
Schedule of Equity Method Investments [Line Items]
Ownership percentage	25.00%	25.00%
SGM Norsom | SGM
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%
SGM Norsom | SAIC
Schedule of Equity Method Investments [Line Items]
Ownership percentage	25.00%
SGM DY
Schedule of Equity Method Investments [Line Items]
Ownership percentage	25.00%	25.00%
SGM DY | SGM
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%
SGM DY | SAIC
Schedule of Equity Method Investments [Line Items]
Ownership percentage	25.00%
SGM DYPT
Schedule of Equity Method Investments [Line Items]
Ownership percentage	25.00%	25.00%
SGM DYPT | SGM
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%
SGM DYPT | SAIC
Schedule of Equity Method Investments [Line Items]
Ownership percentage	25.00%
SAIC-GMAC
Schedule of Equity Method Investments [Line Items]
Equity in net assets of nonconsolidated affiliates	$ 1,500
Ownership percentage	35.00%	35.00%
Temporary impairment charge	$ 300
SAIC-GMAC | Measurement Input, Discount Rate
Schedule of Equity Method Investments [Line Items]
Measurement input	0.130
SAIC-GMAC | Measurement Input, Long-Term Revenue Growth Rate
Schedule of Equity Method Investments [Line Items]
Measurement input	0.035
SAIC-GMAC | SGM
Schedule of Equity Method Investments [Line Items]
Ownership percentage	20.00%
SAIC-GMAC | Shanghai Automotive Group Finance Company Ltd.
Schedule of Equity Method Investments [Line Items]
Ownership percentage	45.00%
SAIC-GMF Leasing Co., Ltd.
Schedule of Equity Method Investments [Line Items]
Ownership percentage	35.00%	35.00%
SAIC-GMF Leasing Co., Ltd. | SGM
Schedule of Equity Method Investments [Line Items]
Ownership percentage	20.00%
SAIC-GMF Leasing Co., Ltd. | SAIC Financial Holdings Company
Schedule of Equity Method Investments [Line Items]
Ownership percentage	45.00%
Automotive China JVs
Schedule of Equity Method Investments [Line Items]
Equity loss	$ 4,400
Impairment and restructuring charges	2,000
Temporary impairment charge	2,100
SGM, SGM Norsom, SGM DY, and SGM DYPT
Schedule of Equity Method Investments [Line Items]
Equity in net assets of nonconsolidated affiliates	$ 2,400
SGM, SGM Norsom, SGM DY, and SGM DYPT | Measurement Input, Discount Rate
Schedule of Equity Method Investments [Line Items]
Measurement input	0.165
SGM, SGM Norsom, SGM DY, and SGM DYPT | Measurement Input, Long-Term Revenue Growth Rate
Schedule of Equity Method Investments [Line Items]
Measurement input	0.005
SGM, SGM Norsom, SGM DY, and SGM DYPT | Minimum | Measurement Input, Passenger Vehicle Industry Volumes
Schedule of Equity Method Investments [Line Items]
Measurement input | vehicle	23.3
SGM, SGM Norsom, SGM DY, and SGM DYPT | Minimum | Measurement Input, Market Share
Schedule of Equity Method Investments [Line Items]
Measurement input	2.0
SGM, SGM Norsom, SGM DY, and SGM DYPT | Maximum | Measurement Input, Passenger Vehicle Industry Volumes
Schedule of Equity Method Investments [Line Items]
Measurement input | vehicle	24.0
SGM, SGM Norsom, SGM DY, and SGM DYPT | Maximum | Measurement Input, Market Share
Schedule of Equity Method Investments [Line Items]
Measurement input	0.022

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