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Supplemental Financial Information for Acquisition (Details) - The Chubb Corporation [Member] - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Business Acquisition [Line Items]    
Actual Revenue of Chubb Corp since Acquisition Date $ 2,656 $ 7,888
Actual Net Income of Chubb Corp since Acquisition Date 483 1,064
Pro Forma Total Revenues 8,521 23,758
Pro Forma Net Income $ 1,345 $ 2,591
Pro Forma Earnings Per Share, Basic $ 2.87 $ 5.54
Pro Forma Earnings Per Share, Diluted $ 2.85 $ 5.50