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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% |  |  |

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