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Supplemental Financial Information for Acquisition (Details) - The Chubb Corporation [Member] - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2016
Business Acquisition [Line Items]    
Actual Revenue of Chubb Corp since Acquisition Date $ 2,487  
Actual Net Income of Chubb Corp since Acquisition Date $ 255  
Pro Forma Total Revenues   $ 7,322
Pro Forma Net Income   $ 534
Pro Forma Earnings Per Share, Basic   $ 1.14
Pro Forma Earnings Per Share, Diluted   $ 1.14