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Financial Instruments and Risk Management (Market risk - Sensitivity Analysis Non-derivative Financial Instruments) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Euro/U.S Dollar [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) $ (96) $ (95)
U.S Dollar/British Pound [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 2 (4)
U.S Dollar/Israeli Shekel [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 134 98
U.S Dollar/Chinese Yuan Renminbi [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (1) (1)
U.S Dollar/Turkey Lira [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) $ (1) $ (1)