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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, 2020
Dec. 31, 2019
Disclosure of financial instruments [Line Items]    
Carrying amount $ 883 $ 778
Israel [Member]    
Disclosure of financial instruments [Line Items]    
Carrying amount 67 72
Europe [Member]    
Disclosure of financial instruments [Line Items]    
Carrying amount 330 252
Asia [Member]    
Disclosure of financial instruments [Line Items]    
Carrying amount 258 249
North America [Member]    
Disclosure of financial instruments [Line Items]    
Carrying amount 144 114
Others [Member]    
Disclosure of financial instruments [Line Items]    
Carrying amount 16 17
South America [Member]    
Disclosure of financial instruments [Line Items]    
Carrying amount $ 68 $ 74