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Financial Instruments and Risk Management (Market risk - Sensitivity Analysis) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Euro/U.S Dollar [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) $ (95) $ (64)
U.S Dollar/British Pound [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (4) (3)
U.S Dollar/Israeli Shekel [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 98 92
U.S Dollar/Chinese Yuan Renminbi [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (1) (12)
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) 4  
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) 0  
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) 52  
Option contract [Member] | U.S Dollar/Israeli Shekel [Member] | Decrease 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 22  
Option contract [Member] | U.S Dollar/Israeli Shekel [Member] | Increase 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (8)  
Option contract [Member] | U.S Dollar/Israeli Shekel [Member] | Increase 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (38)  
Swap contract [Member] | Euro/U.S Dollar [Member] | Decrease 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (45)  
Swap contract [Member] | Euro/U.S Dollar [Member] | Decrease 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (22)  
Swap contract [Member] | Euro/U.S Dollar [Member] | Increase 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 22  
Swap contract [Member] | Euro/U.S Dollar [Member] | Increase 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 45  
Swap contract [Member] | U.S Dollar/Israeli Shekel [Member] | Decrease 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 63  
Swap contract [Member] | U.S Dollar/Israeli Shekel [Member] | Decrease 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 30  
Swap contract [Member] | U.S Dollar/Israeli Shekel [Member] | Increase 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (27)  
Swap contract [Member] | U.S Dollar/Israeli Shekel [Member] | Increase 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (52)  
Forward contracts [Member] | Euro/U.S Dollar [Member] | Decrease 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (6)  
Forward contracts [Member] | Euro/U.S Dollar [Member] | Decrease 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (3)  
Forward contracts [Member] | Euro/U.S Dollar [Member] | Increase 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 3  
Forward contracts [Member] | Euro/U.S Dollar [Member] | Increase 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 7  
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) 34  
Forward contracts [Member] | U.S Dollar/Israeli Shekel [Member] | Decrease 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 16  
Forward contracts [Member] | U.S Dollar/Israeli Shekel [Member] | Increase 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (15)  
Forward contracts [Member] | U.S Dollar/Israeli Shekel [Member] | Increase 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (28)  
Forward contracts [Member] | U.S Dollar/Japanese Yen [Member] | Decrease 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (1)  
Forward contracts [Member] | U.S Dollar/Japanese Yen [Member] | Decrease 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 0  
Forward contracts [Member] | U.S Dollar/Japanese Yen [Member] | Increase 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 0  
Forward contracts [Member] | U.S Dollar/Japanese Yen [Member] | Increase 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) $ 1