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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, 2018
Dec. 31, 2017
Disclosure of financial instruments [Line Items]    
Carrying amount $ 990 $ 932
Israel [Member]    
Disclosure of financial instruments [Line Items]    
Carrying amount 72 70
Asia [Member]    
Disclosure of financial instruments [Line Items]    
Carrying amount 342 293
North America [Member]    
Disclosure of financial instruments [Line Items]    
Carrying amount 150 131
Others [Member]    
Disclosure of financial instruments [Line Items]    
Carrying amount 26 36
Western Europe [Member]    
Disclosure of financial instruments [Line Items]    
Carrying amount 294 332
South America [Member]    
Disclosure of financial instruments [Line Items]    
Carrying amount $ 106 $ 70