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Inventories (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Inventory Disclosure [Abstract] |  |
Total productive material, supplies and work in process | $ 6,833 | $ 6,444
Finished product, including service parts | 8,485 | 8,120
Total inventories | 15,318 | 14,564
Inventory [Line Items] |  |
Inventory allowance | 2,500 | 2,000
Electric Vehicle Inventory |  |
Inventory [Line Items] |  |
Inventory allowance | $ 1,800 | $ 1,400

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