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Inventories - Schedule of Inventory Components (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Inventory Disclosure [Abstract] |  |
Finished goods | $ 671 | $ 668
Work-in-process | 1,316 | 1,371
Purchased raw materials | 343 | 366
Operating supplies | 99 | 87
Total inventories | $ 2,429 | $ 2,492

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