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Taxes on Income - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Income Tax Examination [Line Items]      
Effective income tax rate (as percent) 44.90% 22.30%  
Research and development $ 3,196 $ 1,830  
Transition tax liability     $ 5,300
Net transition tax payment     5,100
Provisional deferred tax benefit     779
2017 Tax Cuts and Jobs Act (TCJA)      
Income Tax Examination [Line Items]      
Deferred taxes     $ 2,000
Eisai      
Income Tax Examination [Line Items]      
Research and development $ 1,400