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Supplemental Financial Information for Acquisition (Details) - The Chubb Corporation [Member] - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
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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

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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=65885119&loc=d3e1392-128463 + Details
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