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Inventories (Information) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Notes to Consolidated Financial Statements [Abstract]    
Finished products $ 709 $ 773
Work in progress 269 267
Raw materials 212 194
Spare parts 142 129
Total Inventories 1,332 1,363
Less non-current inventories (presented in non-current assets) 106 96
Total inventories $ 1,226 $ 1,267