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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, 2017
USD ($)
Decrease 1% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) $ 0
Decrease 0.5% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) 0
Increase 0.5% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) 0
Increase 1% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) (1)
Non-derivative instruments [Member] | Decrease 1% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) 11
Non-derivative instruments [Member] | Decrease 1% [Member] | Changes in Euro interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) 1
Non-derivative instruments [Member] | Decrease 1% [Member] | Changes in Chinese Yuan Renminbi interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) 2
Non-derivative instruments [Member] | Decrease 0.5% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) 5
Non-derivative instruments [Member] | Decrease 0.5% [Member] | Changes in Euro interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) 0 [1]
Non-derivative instruments [Member] | Decrease 0.5% [Member] | Changes in Chinese Yuan Renminbi 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) (5)
Non-derivative instruments [Member] | Increase 0.5% [Member] | Changes in Euro interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) 0 [1]
Non-derivative instruments [Member] | Increase 0.5% [Member] | Changes in Chinese Yuan Renminbi 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) (11)
Non-derivative instruments [Member] | Increase 1% [Member] | Changes in Euro interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) (1)
Non-derivative instruments [Member] | Increase 1% [Member] | Changes in Chinese Yuan Renminbi interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) (2)
Swap contract [Member] | Decrease 1% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) (11)
Swap contract [Member] | Decrease 1% [Member] | Changes in Israeli Shekel interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) 27
Swap contract [Member] | Decrease 0.5% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) (5)
Swap contract [Member] | Decrease 0.5% [Member] | Changes in Israeli Shekel interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) 14
Swap contract [Member] | Increase 0.5% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) 5
Swap contract [Member] | Increase 0.5% [Member] | Changes in Israeli Shekel interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) (13)
Swap contract [Member] | Increase 1% [Member] | Changes in US Dollar interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) 10
Swap contract [Member] | Increase 1% [Member] | Changes in Israeli Shekel interest [Member]  
Disclosure of financial instruments [Line Items]  
Impact on profit (loss) $ (26)
[1] Less than $1 million.