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Supplemental Balance Sheet Data - Inventory (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Raw materials | $ 393 | $ 394
Work in process | 196 | 189
Finished goods | 1,253 | 1,202
Supplies and other | 270 | 263
Inventory, Gross | 2,112 | 2,048
Inventory, LIFO Reserve | (156) | (145)
Total | 1,956 | 1,903
LIFO |  |
Raw materials | 132 | 131
Work in process | 112 | 103
Finished goods | 532 | 453
Supplies and other | 0 | 0
Inventory, Gross | 776 | 687
Inventory, LIFO Reserve | (156) | (145)
Total | 620 | 542
Non-LIFO |  |
Raw materials | 261 | 263
Work in process | 84 | 86
Finished goods | 721 | 749
Supplies and other | 270 | 263
Inventory, Gross | 1,336 | 1,361
Inventory, LIFO Reserve | 0 | 0
Total | $ 1,336 | $ 1,361

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