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Details of Income Statement Items (Financing Income and Expenses) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financing income [Abstract]      
Financing income recorded in relation to employee benefits $ 7 $ 0 $ 0
Net change in fair value of derivative financial instruments 0 104 24
Net gain from changes in exchange rates and interest income 49 1 1
Finance income 56 105 25
Financing expenses [Abstract]      
Interest expenses to banks and others 117 120 151
Financing expenses in relation to employee benefits 0 38 17
Banks and finance institutions commissions (mainly commission on early repayment of loans) 18 16 4
Net change expenses in fair value of derivative financial instruments 101 0 0
Net loss from changes in exchange rates 0 78 7
Financing expenses 236 252 179
Net of borrowing costs capitalized 22 23 22
Finance expenses 214 229 157
Net financing expenses recorded in the income statements $ 158 $ 124 $ 132