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Inventories (Information) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Notes to Consolidated Financial Statements [Abstract]    
Finished products $ 807 $ 800
Work in progress 263 326
Raw materials 207 176
Spare parts 125 127
Total Inventories 1,402 1,429
Less - non-current inventories. Mainly raw materials (presented in non-current assets) 152 117
Current inventories $ 1,250 $ 1,312