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Taxes on Income (Deferred Taxes by Currency) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Deferred income taxes [Line Items]      
Deferred income taxe $ (96) $ (153) $ (152)
Euro [Member]      
Deferred income taxes [Line Items]      
Deferred income taxe 33 30  
British Pound [Member]      
Deferred income taxes [Line Items]      
Deferred income taxe 22 17  
US Dollar [Member]      
Deferred income taxes [Line Items]      
Deferred income taxe 10 (25)  
Israeli Shekel [Member]      
Deferred income taxes [Line Items]      
Deferred income taxe (166) (179)  
Other [Member]      
Deferred income taxes [Line Items]      
Deferred income taxe $ 5 $ 4