XML 45 R36.htm IDEA: XBRL DOCUMENT v2.4.0.6
Investments (Aggregate Fair Value And Gross Unrealized Loss By Length Of Time The Security Has Continuously Been In An Unrealized Loss Position) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Investment [Line Items]    
Investment securities, Unrealized loss position, 0-12 Months, Fair Value $ 5,904 $ 5,927
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss (120.9) (288.9)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value 1,193 1,481
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss (134.6) (245.9)
Investment securities, Unrealized loss position, Total Fair Value 7,097 7,408
Investment securities, Unrealized loss position, Total Gross Unrealized Loss (255.5) (534.8)
U.S. Treasury And Agency [Member]
   
Investment [Line Items]    
Investment securities, Unrealized loss position, 0-12 Months, Fair Value 820  
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss (9.5)  
Investment securities, Unrealized loss position, Total Fair Value 820  
Investment securities, Unrealized loss position, Total Gross Unrealized Loss (9.5)  
Foreign [Member]
   
Investment [Line Items]    
Investment securities, Unrealized loss position, 0-12 Months, Fair Value 1,558 1,801
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss (25.7) (82.2)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value 430 529
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss (18.3) (40.0)
Investment securities, Unrealized loss position, Total Fair Value 1,988 2,330
Investment securities, Unrealized loss position, Total Gross Unrealized Loss (44.0) (122.2)
Corporate Securities [Member]
   
Investment [Line Items]    
Investment securities, Unrealized loss position, 0-12 Months, Fair Value 1,937 3,084
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss (56.4) (148.2)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value 201 268
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss (17.8) (32.2)
Investment securities, Unrealized loss position, Total Fair Value 2,138 3,352
Investment securities, Unrealized loss position, Total Gross Unrealized Loss (74.2) (180.4)
Mortgage-Backed Securities [Member]
   
Investment [Line Items]    
Investment securities, Unrealized loss position, 0-12 Months, Fair Value 464 440
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss (4.4) (7.5)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value 500 586
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss (95.0) (170.2)
Investment securities, Unrealized loss position, Total Fair Value 964 1,026
Investment securities, Unrealized loss position, Total Gross Unrealized Loss (99.4) (177.7)
States, Municipalities, And Political Subdivisions [Member]
   
Investment [Line Items]    
Investment securities, Unrealized loss position, 0-12 Months, Fair Value 480 30
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss (7.2) (0.4)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value 62 98
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss (3.5) (3.5)
Investment securities, Unrealized loss position, Total Fair Value 542 128
Investment securities, Unrealized loss position, Total Gross Unrealized Loss (10.7) (3.9)
Total Fixed Maturities [Member]
   
Investment [Line Items]    
Investment securities, Unrealized loss position, 0-12 Months, Fair Value 5,259 5,355
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss (103.2) (238.3)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value 1,193 1,481
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss (134.6) (245.9)
Investment securities, Unrealized loss position, Total Fair Value 6,452 6,836
Investment securities, Unrealized loss position, Total Gross Unrealized Loss (237.8) (484.2)
Equity Securities [Member]
   
Investment [Line Items]    
Investment securities, Unrealized loss position, 0-12 Months, Fair Value 489 484
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss (12.0) (42.3)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value     
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss     
Investment securities, Unrealized loss position, Total Fair Value 489 484
Investment securities, Unrealized loss position, Total Gross Unrealized Loss (12.0) (42.3)
Other Investments [Member]
   
Investment [Line Items]    
Investment securities, Unrealized loss position, 0-12 Months, Fair Value 156 88
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss (5.7) (8.3)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value     
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss     
Investment securities, Unrealized loss position, Total Fair Value 156 88
Investment securities, Unrealized loss position, Total Gross Unrealized Loss $ (5.7) $ (8.3)