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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, 2019
Dec. 31, 2018
Disclosure of financial instruments [Line Items]    
Carrying amount $ 778 $ 990
Israel [Member]    
Disclosure of financial instruments [Line Items]    
Carrying amount 72 72
Europe [Member]    
Disclosure of financial instruments [Line Items]    
Carrying amount 252 294
Asia [Member]    
Disclosure of financial instruments [Line Items]    
Carrying amount 249 342
North America [Member]    
Disclosure of financial instruments [Line Items]    
Carrying amount 114 150
Others [Member]    
Disclosure of financial instruments [Line Items]    
Carrying amount 17 26
South America [Member]    
Disclosure of financial instruments [Line Items]    
Carrying amount $ 74 $ 106