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Inventories (Tables) | 12 Months Ended
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Dec. 31, 2019
Inventory Disclosure [Abstract] |
Schedule of Inventory Components | Inventories
December 31, | 2019 |  | 2018
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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