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Financial Instruments and Risk Management (Market risk - Sensitivity Analysis) (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)
Option contract [Member] | Euro/U.S Dollar [Member] | Decrease 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (6)  
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) 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) 1  
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) 44  
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) (14)  
Option contract [Member] | U.S Dollar/Israeli Shekel [Member] | Increase 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (26)  
Swap contract [Member] | Euro/U.S Dollar [Member] | Decrease 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (41)  
Swap contract [Member] | Euro/U.S Dollar [Member] | Decrease 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (19)  
Swap contract [Member] | Euro/U.S Dollar [Member] | Increase 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 18  
Swap contract [Member] | Euro/U.S Dollar [Member] | Increase 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 33  
Swap contract [Member] | U.S Dollar/British Pound [Member] | Decrease 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 8  
Swap contract [Member] | U.S Dollar/British Pound [Member] | Decrease 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 4  
Swap contract [Member] | U.S Dollar/British Pound [Member] | Increase 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (3)  
Swap contract [Member] | U.S Dollar/British Pound [Member] | Increase 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (6)  
Swap contract [Member] | U.S Dollar/Israeli Shekel [Member] | Decrease 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 101  
Swap contract [Member] | U.S Dollar/Israeli Shekel [Member] | Decrease 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 48  
Swap contract [Member] | U.S Dollar/Israeli Shekel [Member] | Increase 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (43)  
Swap contract [Member] | U.S Dollar/Israeli Shekel [Member] | Increase 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (82)  
Forward contracts [Member] | Euro/U.S Dollar [Member] | Decrease 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (17)  
Forward contracts [Member] | Euro/U.S Dollar [Member] | Decrease 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (8)  
Forward contracts [Member] | Euro/U.S Dollar [Member] | Increase 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 7  
Forward contracts [Member] | Euro/U.S Dollar [Member] | Increase 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) 14  
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) 1  
Forward contracts [Member] | U.S Dollar/British Pound [Member] | Increase 5% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (1)  
Forward contracts [Member] | U.S Dollar/British Pound [Member] | Increase 10% [Member]    
Disclosure of financial instruments [Line Items]    
Impact on profit (loss) (3)  
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) (20)  
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/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