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Financial Instruments and Risk Management (Credit Risk - Maximum Exposure to Credit Risk for Trade Receivables by Geographic Region) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial instruments [Line Items]    
Carrying amount $ 932 $ 966
Israel [Member]    
Disclosure of financial instruments [Line Items]    
Carrying amount 70 82
Asia [Member]    
Disclosure of financial instruments [Line Items]    
Carrying amount 227 261
North America [Member]    
Disclosure of financial instruments [Line Items]    
Carrying amount 131 154
Others [Member]    
Disclosure of financial instruments [Line Items]    
Carrying amount 102 93
Western Europe [Member]    
Disclosure of financial instruments [Line Items]    
Carrying amount 332 274
South America [Member]    
Disclosure of financial instruments [Line Items]    
Carrying amount $ 70 $ 102