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Taxes on Income (Deferred Taxes by Currency) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deferred income taxes [Line Items]      
Deferred income taxes $ (175) $ (96) $ (153)
Euro [Member]      
Deferred income taxes [Line Items]      
Deferred income taxes 22 33  
British Pound [Member]      
Deferred income taxes [Line Items]      
Deferred income taxes 21 22  
US Dollar [Member]      
Deferred income taxes [Line Items]      
Deferred income taxes (7) 10  
Israeli Shekel [Member]      
Deferred income taxes [Line Items]      
Deferred income taxes (204) (166)  
Other [Member]      
Deferred income taxes [Line Items]      
Deferred income taxes $ (7) $ 5