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Inventories (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Inventory Disclosure [Abstract] |  |
Total productive material, supplies and work in process | $ 4,713 | $ 4,274
Finished product, including service parts | 5,685 | 5,542
Total inventories | $ 10,398 | $ 9,816

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