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Financial Instruments and Risk Management (Market Risk - Sensitivity Analysis for Variable Rate Instruments) (Details) - Swap contract [Member]
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Decrease 1% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) $ (39)
Decrease 1% [Member] | Changes in Israeli Shekel interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) 49
Decrease 1% [Member] | Changes in Euro interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) (2)
Decrease 0.5% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) (19)
Decrease 0.5% [Member] | Changes in Israeli Shekel interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) 24
Decrease 0.5% [Member] | Changes in Euro interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) (1)
Increase 0.5% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) 18
Increase 0.5% [Member] | Changes in Israeli Shekel interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) (22)
Increase 0.5% [Member] | Changes in Euro interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) 1
Increase 1% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) 36
Increase 1% [Member] | Changes in Israeli Shekel interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) (42)
Increase 1% [Member] | Changes in Euro interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) $ 2