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Taxes on Income (Deferred Taxes by Currency) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deferred income taxes [Line Items]      
Deferred income taxes $ (199) $ (232) $ (175)
Euro [Member]      
Deferred income taxes [Line Items]      
Deferred income taxes 73 44  
British Pound [Member]      
Deferred income taxes [Line Items]      
Deferred income taxes 17 16  
US Dollar [Member]      
Deferred income taxes [Line Items]      
Deferred income taxes (6) (1)  
Israeli Shekel [Member]      
Deferred income taxes [Line Items]      
Deferred income taxes (280) (285)  
Other [Member]      
Deferred income taxes [Line Items]      
Deferred income taxes $ (3) $ (6)