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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

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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