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Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Inventories      
Finished goods $ 957 $ 868 $ 813
Raw materials 144 151 171
Operating supplies 52 52 53
Inventories $ 1,153 $ 1,071 $ 1,037