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Supplemental Data (Summary of Inventories) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Inventory |  |
Raw materials | $ 394 | $ 321
Work in process | 189 | 206
Finished goods | 1,202 | 1,147
Supplies and other | 263 | 271
Gross inventories | 2,048 | 1,945
Excess of FIFO or weighted-average cost over LIFO cost | (145) | (155)
Total | 1,903 | 1,790
LIFO |  |
Inventory |  |
Raw materials | 131 | 85
Work in process | 103 | 113
Finished goods | 453 | 451
Supplies and other | 0 | 0
Gross inventories | 687 | 649
Excess of FIFO or weighted-average cost over LIFO cost | (145) | (155)
Total | 542 | 494
Non- LIFO |  |
Inventory |  |
Raw materials | 263 | 236
Work in process | 86 | 93
Finished goods | 749 | 696
Supplies and other | 263 | 271
Gross inventories | 1,361 | 1,296
Excess of FIFO or weighted-average cost over LIFO cost | 0 | 0
Total | $ 1,361 | $ 1,296

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