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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, 2018
Dec. 31, 2017
Euro/U.S Dollar [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) $ (64) $ (9)
U.S Dollar/British Pound [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (3) 3
U.S Dollar/Israeli Shekel [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 92 92
U.S Dollar/Chinese Yuan Renminbi [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (12) (4)
U.S Dollar/Turkey Lira [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) $ (1) $ (1)