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Taxes on Income (Narratives) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Notes to Consolidated Financial Statements [Abstract]      
Income tax rate 23.00% 24.00% 25.00%
Temporary difference related to distribution of a dividend from exempt income in respect of which deferred taxes were not recognized $ 650    
The amount of deferred taxes which were not recognized 162    
Carryforward tax losses of subsidiaries for which deferred taxes were recorded 477 $ 308  
Carryforward tax losses for which deferred taxes were not recorded 322 322  
Capital losses for which deferred taxes were not recorded 134 159  
Capital losses for tax purposes available for carryforward to future years for which deferred taxes were recorded 15 $ 16  
Tax assessment from the Israeli Tax Authority (ITA) in respect of the 2012 2014 tax years 73    
Royalties paid by the company to the Israeli government $ 133