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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, 2018
USD ($)
Decrease 1% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) $ (19)
Decrease 0.5% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) (10)
Increase 0.5% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) 10
Increase 1% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) 19
Non-derivative instruments [Member] | Decrease 1% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) (1)
Non-derivative instruments [Member] | Decrease 0.5% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) (1)
Non-derivative instruments [Member] | Increase 0.5% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) 1
Non-derivative instruments [Member] | Increase 1% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) 1
Swap contract [Member] | Decrease 1% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) (18)
Swap contract [Member] | Decrease 1% [Member] | Changes in Israeli Shekel interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) 19
Swap contract [Member] | Decrease 0.5% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) (9)
Swap contract [Member] | Decrease 0.5% [Member] | Changes in Israeli Shekel interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) 10
Swap contract [Member] | Increase 0.5% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) 9
Swap contract [Member] | Increase 0.5% [Member] | Changes in Israeli Shekel interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) (10)
Swap contract [Member] | Increase 1% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) 18
Swap contract [Member] | Increase 1% [Member] | Changes in Israeli Shekel interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) $ (19)