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Supplemental Financial Information for Acquisition (Details) - The Chubb Corporation [Member] - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Business Acquisition [Line Items]    
Actual Revenue of Chubb Corp since Acquisition Date $ 2,745 $ 5,232
Actual Net Income of Chubb Corp since Acquisition Date 326 581
Pro Forma Total Revenues 7,915 15,237
Pro Forma Net Income $ 712 $ 1,246
Pro Forma Earnings Per Share, Basic $ 1.52 $ 2.67
Pro Forma Earnings Per Share, Diluted $ 1.51 $ 2.65