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Taxes on Income - Income Before Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Domestic $ 3,483 $ 518 $ 2,247
Foreign 3,038 4,141 3,154
Income Before Taxes $ 6,521 $ 4,659 $ 5,401