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SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION - Inventory (Details) - USD ($) $ in Millions | 12 Months Ended |
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Dec. 31, 2022 | Dec. 31, 2023
Disclosure Text Block [Abstract] |  |
Finished and semi-finished goods | $ 2,971 | $ 2,573
Raw materials | 1,794 | 1,476
Total product inventories | 4,765 | 4,049
Manufacturing supplies and critical spares | 365 | 411
Inventories | 5,130 | 4,460
Excess of current cost over LIFO cost of iron ore inventories | 169 | 131
Effect of inventory build |  | $ 21
Effect of inventory reduction | $ 36 |

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