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Inventories (Information) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Notes to Consolidated Financial Statements [Abstract]    
Finished products $ 772 $ 709
Work in progress 258 269
Raw materials 216 212
Spare parts 143 142
Total Inventories 1,389 1,332
Less - non-current inventories. Mainly raw materials (presented in non-current assets) 99 106
Current inventories $ 1,290 $ 1,226