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Details of Income Statement Items (Financing Income and Expenses) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing income [Abstract]      
Net change in fair value of derivative financial instruments $ 104 $ 24 $ 0
Net gain from changes in exchange rates and interest income 1 1 52
Finance income 105 25 52
Financing expenses [Abstract]      
Interest expenses to banks and others 120 151 101
Financing expenses in relation to employee benefits 38 17 18
Banks and finance institutions commissions 16 4 5
Net change expenses in fair value of derivative financial instruments 0 0 57
Net loss from changes in exchange rates 78 7 0
Financing expenses 252 179 181
Net of borrowing costs capitalized 23 22 21
Finance expenses 229 157 160
Net financing expenses recorded in the income statements $ 124 $ 132 $ 108