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Financial Instruments and Risk Management (Market Risk - Sensitivity Analysis for Variable Rate Instruments) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
Decrease 1% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) $ (10)
Decrease 0.5% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) (5)
Increase 0.5% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) 5
Increase 1% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) 10
Non-derivative instruments [Member] | Decrease 1% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) 4
Non-derivative instruments [Member] | Decrease 0.5% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) 2
Non-derivative instruments [Member] | Increase 0.5% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) (2)
Non-derivative instruments [Member] | Increase 1% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) (4)
Swap contract [Member] | Decrease 1% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) (14)
Swap contract [Member] | Decrease 1% [Member] | Changes in Israeli Shekel interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) 16
Swap contract [Member] | Decrease 1% [Member] | Changes in Euro interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) (1)
Swap contract [Member] | Decrease 0.5% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) (7)
Swap contract [Member] | Decrease 0.5% [Member] | Changes in Israeli Shekel interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) 8
Swap contract [Member] | Decrease 0.5% [Member] | Changes in Euro interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) 0
Swap contract [Member] | Increase 0.5% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) 7
Swap contract [Member] | Increase 0.5% [Member] | Changes in Israeli Shekel interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) (8)
Swap contract [Member] | Increase 0.5% [Member] | Changes in Euro interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) 0
Swap contract [Member] | Increase 1% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) 14
Swap contract [Member] | Increase 1% [Member] | Changes in Israeli Shekel interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) (16)
Swap contract [Member] | Increase 1% [Member] | Changes in Euro interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) $ 1