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Financial Instruments and Risk Management (Market risk - Sensitivity Analysis) (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)
Option contract [Member] | Euro/U.S Dollar [Member] | Decrease 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (4)  
Option contract [Member] | Euro/U.S Dollar [Member] | Decrease 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (2)  
Option contract [Member] | Euro/U.S Dollar [Member] | Increase 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 2  
Option contract [Member] | Euro/U.S Dollar [Member] | Increase 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 5  
Option contract [Member] | U.S Dollar/British Pound [Member] | Decrease 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 1  
Option contract [Member] | U.S Dollar/British Pound [Member] | Decrease 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 0  
Option contract [Member] | U.S Dollar/British Pound [Member] | Increase 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (1)  
Option contract [Member] | U.S Dollar/British Pound [Member] | Increase 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (1)  
Option contract [Member] | U.S Dollar/Israeli Shekel [Member] | Decrease 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 43  
Option contract [Member] | U.S Dollar/Israeli Shekel [Member] | Decrease 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 19  
Option contract [Member] | U.S Dollar/Israeli Shekel [Member] | Increase 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (41)  
Option contract [Member] | U.S Dollar/Israeli Shekel [Member] | Increase 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (75)  
Swap contract [Member] | Euro/U.S Dollar [Member] | Decrease 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (34)  
Swap contract [Member] | Euro/U.S Dollar [Member] | Decrease 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (17)  
Swap contract [Member] | Euro/U.S Dollar [Member] | Increase 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 17  
Swap contract [Member] | Euro/U.S Dollar [Member] | Increase 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 34  
Swap contract [Member] | U.S Dollar/Israeli Shekel [Member] | Decrease 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 58  
Swap contract [Member] | U.S Dollar/Israeli Shekel [Member] | Decrease 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 28  
Swap contract [Member] | U.S Dollar/Israeli Shekel [Member] | Increase 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (25)  
Swap contract [Member] | U.S Dollar/Israeli Shekel [Member] | Increase 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (48)  
Forward contracts [Member] | Euro/U.S Dollar [Member] | Decrease 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (8)  
Forward contracts [Member] | Euro/U.S Dollar [Member] | Decrease 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (4)  
Forward contracts [Member] | Euro/U.S Dollar [Member] | Increase 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 4  
Forward contracts [Member] | Euro/U.S Dollar [Member] | Increase 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 9  
Forward contracts [Member] | Euro/British Pound [Member] | Decrease 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 4  
Forward contracts [Member] | Euro/British Pound [Member] | Decrease 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 2  
Forward contracts [Member] | Euro/British Pound [Member] | Increase 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (2)  
Forward contracts [Member] | Euro/British Pound [Member] | Increase 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (4)  
Forward contracts [Member] | U.S Dollar/British Pound [Member] | Decrease 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 3  
Forward contracts [Member] | U.S Dollar/British Pound [Member] | Decrease 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 2  
Forward contracts [Member] | U.S Dollar/British Pound [Member] | Increase 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (2)  
Forward contracts [Member] | U.S Dollar/British Pound [Member] | Increase 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (4)  
Forward contracts [Member] | U.S Dollar/Israeli Shekel [Member] | Decrease 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 39  
Forward contracts [Member] | U.S Dollar/Israeli Shekel [Member] | Decrease 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 19  
Forward contracts [Member] | U.S Dollar/Israeli Shekel [Member] | Increase 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (17)  
Forward contracts [Member] | U.S Dollar/Israeli Shekel [Member] | Increase 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (32)  
Forward contracts [Member] | U.S Dollar/Chinese Yuan Renminbi [Member] | Decrease 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 3  
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) (1)  
Forward contracts [Member] | U.S Dollar/Chinese Yuan Renminbi [Member] | Increase 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) $ (3)