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Details of Income Statement Items (Financing Income and Expenses) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financing income [Abstract]      
Net gain from change in fair value of derivative designated as cash flow hedge $ 54 $ 38 $ 0
Interest income from banks and others 7 8 3
Financing income in relation to employee benefits 0 0 7
Net gain from change in fair value of derivative designated as economic hedge 0 45 0
Net gain from changes in exchange rates 0 0 46
Finance income 61 91 56
Financing expenses [Abstract]      
Interest expenses to banks and others 120 125 117
Net loss from changes in exchange rates 58 72 0
Financing expenses in relation to employee's benefits plans 38 39 0
Net gain from change in fair value of derivative designated as economic hedge - Expenses 23 0 101
Banks and finance institutions commissions (mainly commission on early repayment of loans) 4 3 18
Financing expenses 243 239 236
Net of borrowing costs capitalized 24 19 22
Finance expenses 219 220 214
Net financing expenses recorded in the income statements $ 158 $ 129 $ 158