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Taxes on Income (Narratives) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Notes to Consolidated Financial Statements [Abstract]      
Temporary difference related to distribution of a dividend from exempt income in respect of which deferred taxes were not recognized $ 702    
Carryforward tax losses of subsidiaries for which deferred taxes were recorded 308 $ 454  
Carryforward tax losses for which deferred taxes were not recorded 322 409  
Capital losses for which deferred taxes were not recorded 159 $ 174  
Tax assessment from the Israeli Tax Authority (ITA) in respect of the 2012 2014 tax years 50    
Cancellation of Belgium provision - total 28    
Cancellation of Belgium provision - tax income $ 25    
Income tax rate 24.00% 25.00% 26.50%
Tax exposure $ 150