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Taxes on Income - Tax reform estimates (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Effect of Tax Cuts and Jobs Act [Abstract]      
Effective income tax rate   21.00% 35.00%
Provisional increase of tax expense, change in tax rate effect on tax asset position     $ 52
Provisional increase of transition tax expense     $ 31
Final impact of measurement period adjustments   $ (45)  
Amount of tax expense related to GILTI $ 12