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Inventories (Information) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Notes to Consolidated Financial Statements [Abstract]    
Finished products $ 800 $ 772
Work in progress 326 258
Raw materials 176 216
Spare parts 127 143
Total Inventories 1,429 1,389
Less - non-current inventories. Mainly raw materials (presented in non-current assets) 117 99
Current inventories $ 1,312 $ 1,290