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Related and Interested Parties (Transactions with Related and Interested Parties) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Notes to Consolidated Financial Statements [Abstract]      
Sales $ 6 $ 35 $ 32
Cost of sales 97 113 127
Selling, transport and marketing 8 7 9
Financing expenses, net (9) 0 22
Management fees to the parent company $ 1 $ 1 $ 2