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Segment Information (Reconciliation Of Reportable Segments Operating Revenues To Total Revenues Reported In The Consolidated Statements Of Income) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Segment Reporting [Abstract]        
Reportable segments operating revenues $ 17,733.0 $ 15,133.7 $ 52,876.5 $ 45,457.2
Net investment income 167.6 168.6 482.8 507.0
Net realized gains on investments 95.4 54.6 166.4 232.0
Other-than-temporary impairment losses recognized in income (26.2) (3.8) (73.1) (20.6)
Total revenues $ 17,969.8 $ 15,353.1 $ 53,452.6 $ 46,175.6