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Financial Instruments and Risk Management (Market risk - Sensitivity Analysis) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
U.S Dollar/Euro [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) $ (9) $ (75)
U.S Dollar/British Pound [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 3 0
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) (4) 0
U.S Dollar/Brazilian Real risk [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 0 (1)
U.S Dollar/Turkey Lira [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (1) $ (1)
Option contract [Member] | Euro/U.S Dollar [Member] | Decrease 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (7)  
Option contract [Member] | Euro/U.S Dollar [Member] | Decrease 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (3)  
Option contract [Member] | Euro/U.S Dollar [Member] | Increase 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 3  
Option contract [Member] | Euro/U.S Dollar [Member] | Increase 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 6  
Option contract [Member] | U.S Dollar/Israeli Shekel [Member] | Decrease 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 50  
Option contract [Member] | U.S Dollar/Israeli Shekel [Member] | Decrease 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 20  
Option contract [Member] | U.S Dollar/Israeli Shekel [Member] | Increase 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (9)  
Option contract [Member] | U.S Dollar/Israeli Shekel [Member] | Increase 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (36)  
Forward contracts [Member] | Euro/U.S Dollar [Member] | Decrease 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (29)  
Forward contracts [Member] | Euro/U.S Dollar [Member] | Decrease 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (15)  
Forward contracts [Member] | Euro/U.S Dollar [Member] | Increase 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 17  
Forward contracts [Member] | Euro/U.S Dollar [Member] | Increase 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 35  
Forward contracts [Member] | British Pound/U.S Dollar [Member] | Decrease 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (3)  
Forward contracts [Member] | British Pound/U.S Dollar [Member] | Decrease 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (1)  
Forward contracts [Member] | British Pound/U.S Dollar [Member] | Increase 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 1  
Forward contracts [Member] | British Pound/U.S Dollar [Member] | Increase 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 2  
Forward contracts [Member] | British Pound/Euro [Member] | Decrease 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (3)  
Forward contracts [Member] | British Pound/Euro [Member] | Decrease 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (1)  
Forward contracts [Member] | British Pound/Euro [Member] | Increase 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 1  
Forward contracts [Member] | British Pound/Euro [Member] | Increase 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 2  
Forward contracts [Member] | U.S Dollar/Israeli Shekel [Member] | Decrease 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 48  
Forward contracts [Member] | U.S Dollar/Israeli Shekel [Member] | Decrease 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 23  
Forward contracts [Member] | U.S Dollar/Israeli Shekel [Member] | Increase 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (21)  
Forward contracts [Member] | U.S Dollar/Israeli Shekel [Member] | Increase 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (39)  
Forward contracts [Member] | U.S Dollar/Chinese Yuan Renminbi [Member] | Decrease 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (4)  
Forward contracts [Member] | U.S Dollar/Chinese Yuan Renminbi [Member] | Decrease 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (2)  
Forward contracts [Member] | U.S Dollar/Chinese Yuan Renminbi [Member] | Increase 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 2  
Forward contracts [Member] | U.S Dollar/Chinese Yuan Renminbi [Member] | Increase 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) $ 3