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Equity in Net Assets of Nonconsolidated Affiliates (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
May 31, 2025
Schedule of Equity Method Investments [Line Items]                    
Equity income (loss) $ 290     $ 187     $ 684 $ 477    
Automotive China JVs' net sales 48,591     48,757     139,732 139,740    
Automotive China JVs' net income (loss) 1,293 $ 1,894 $ 2,853 3,008 $ 2,877 $ 2,953 6,040 8,837    
Dividends declared             1,600   $ 395  
Distributions received 103           1,100 190    
Automotive China joint ventures equity income (loss)                    
Schedule of Equity Method Investments [Line Items]                    
Automotive China JVs' net sales 6,121     4,480     17,270 13,268    
Automotive China JVs' net income (loss) 144     (282)     341 (724)    
Equity Method Investment, Nonconsolidated Investee or Group of Investees                    
Schedule of Equity Method Investments [Line Items]                    
Undistributed earnings 2,500           2,500      
Undistributed losses 2,700           2,700      
Ultium Cells LLC                    
Schedule of Equity Method Investments [Line Items]                    
Principal amount                   $ 1,800
Stated interest rate                   5.70%
Related party receivable, charges             260      
Equity Method Investee                    
Schedule of Equity Method Investments [Line Items]                    
Undistributed earnings 256,000           256,000      
Automotive China joint ventures equity income (loss)                    
Schedule of Equity Method Investments [Line Items]                    
Equity income (loss) 80     (137)     197 (347)    
Ultium Cells Holdings LLC equity income (loss)                    
Schedule of Equity Method Investments [Line Items]                    
Equity income (loss) 213     309     465 788    
Other joint ventures equity income (loss)                    
Schedule of Equity Method Investments [Line Items]                    
Equity income (loss) $ (3)     $ 15     $ 23 $ 36    
Automotive China Joint Ventures and Ultium Cell Holdings LLC                    
Schedule of Equity Method Investments [Line Items]                    
Change in ownership percentage             0.00%