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Fair Value (Tables)
9 Months Ended
Sep. 30, 2011
Disclosure Fair Value [Abstract] 
Financial assets and liabilities measured at fair value by level
      Fair Value Measurement Using:
   Estimated Fair Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs
   Value (Level 1) (Level 2) (Level 3)
Assets measured at fair value:           
Available for sale securities:           
 Fixed maturities and fixed maturities pledged           
 under securities lending agreements (1):           
 Corporate bonds$ 2,766,651 $ - $ 2,625,630 $ 141,021
 Mortgage backed securities  1,545,321   -   1,545,321   -
 Municipal bonds  1,422,943   -   1,422,943   -
 Commercial mortgage backed securities  1,118,905   -   1,118,905   -
 U.S. government and government agencies  1,263,665   1,263,665   -   -
 Non-U.S. government securities  837,043   -   837,043   -
 Asset backed securities  647,705   -   647,705   -
  Total   9,602,233   1,263,665   8,197,547   141,021
              
 Equity securities  273,213   273,157   56   -
 Other investments  229,974   -   223,974   6,000
 Short-term investments  799,662   771,217   28,445   -
              
Fair value option:           
 Investments accounted for using the           
 fair value option:           
 Corporate bonds  107,215   -   107,215   -
 Non-U.S. government bonds  15,651   -   15,651   -
 Equity securities  100,719   100,719   -   -
 Other investments  95,796   -   95,796   -
  Total   319,381   100,719   218,662   -
              
 TALF investments  392,455   -   392,455   -
  Total assets measured at fair value $ 11,616,918 $ 2,408,758 $ 9,061,139 $ 147,021
              
Liabilities measured at fair value:           
Fair value option:           
 TALF borrowings$ 314,137 $ - $ 314,137 $ -
 Securities sold but not yet purchased (2)  46,526   46,526   -   -
  Total liabilities measured at fair value $ 360,663 $ 46,526 $ 314,137 $ -

      Fair Value Measurement Using:
   Estimated Fair Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs
   Value (Level 1) (Level 2) (Level 3)
Assets measured at fair value:           
Available for sale securities:           
 Fixed maturities and fixed maturities pledged           
 under securities lending agreements (1):           
 Corporate bonds$ 2,714,375 $ - $ 2,560,866 $ 153,509
 Mortgage backed securities  1,806,813   -   1,806,813   -
 Municipal bonds  1,182,100   -   1,182,100   -
 Commercial mortgage backed securities  1,167,299   -   1,167,299   -
 U.S. government and government agencies  872,149   872,149   -   -
 Non-U.S. government securities  732,666   -   732,666   -
 Asset backed securities  558,032   -   558,032   -
  Total   9,033,434   872,149   8,007,776   153,509
              
 Equity securities  310,194   297,623   12,571   -
 Other investments  275,538   -   267,680   7,858
 Short-term investments  915,841   859,042   56,799   -
              
Fair value option:           
 Investments accounted for using the           
 fair value option:           
 Corporate bonds  124,969   -   124,969   -
 Non-U.S. government bonds  -   -   -   -
 Equity securities  94,204   94,204   -   -
 Other investments  -   -   -   -
  Total   219,173   94,204   124,969   -
              
 TALF investments  402,449   -   402,449   -
  Total assets measured at fair value $ 11,156,629 $ 2,123,018 $ 8,872,244 $ 161,367
              
Liabilities measured at fair value:           
Fair value option:           
 TALF borrowings$ 325,770 $ - $ 325,770 $ -
 Securities sold but not yet purchased (2)  41,143   41,143   -   -
  Total liabilities measured at fair value $ 366,913 $ 41,143 $ 325,770 $ -
Reconciliation of beginning and ending balances for all financial instruments measured at fair value using Level 3 inputs
   Fair Value Measurements Using:
   Significant Unobservable Inputs (Level 3)
   Corporate Bonds Other Investments Total
           
Three Months Ended September 30, 2011        
Balance at beginning of period $ 164,456 $ 7,929 $ 172,385
 Total gains or (losses) (realized/unrealized)        
  Included in earnings (1)  (5,742)   -   (5,742)
  Included in other comprehensive income  (17,317)   (1,929)   (19,246)
 Purchases, issuances and settlements        
  Purchases  -   -   -
  Issuances  -   -   -
  Sales  -   -   -
  Settlements  (376)   -   (376)
 Transfers in and/or out of Level 3  -   -   -
Balance at end of period $ 141,021 $ 6,000 $ 147,021
           
Three Months Ended September 30, 2010        
Balance at beginning of period $ 147,891 $ 48,788 $ 196,679
 Total gains or (losses) (realized/unrealized)        
  Included in earnings (1)  2,974   1,813   4,787
  Included in other comprehensive income  18,741   1,226   19,967
 Purchases, issuances and settlements        
  Purchases  -   -   -
  Issuances  -   -   -
  Sales  -   -   -
  Settlements (1)  (42,157)  (42,158)
 Transfers in and/or out of Level 3  -   -   -
Balance at end of period $ 169,605 $ 9,670 $ 179,275

   Fair Value Measurements Using:
   Significant Unobservable Inputs (Level 3)
   Corporate Bonds Other Investments Total
           
Nine Months Ended September 30, 2011        
Balance at beginning of period $ 153,509 $ 7,858 $ 161,367
 Total gains or (losses) (realized/unrealized)        
  Included in earnings (1)  507   1,709   2,216
  Included in other comprehensive income  (3,763)   (2,901)   (6,664)
 Purchases, issuances and settlements        
  Purchases  -   -   -
  Issuances  -   -   -
  Sales  -  (666)  (666)
  Settlements (9,232)   -  (9,232)
 Transfers in and/or out of Level 3  -   -   -
Balance at end of period $ 141,021 $ 6,000 $ 147,021
           
Nine Months Ended September 30, 2010        
Balance at beginning of period $ 178,385 $ 49,668 $ 228,053
 Total gains or (losses) (realized/unrealized)        
  Included in earnings (1)  7,916   2,242   10,158
  Included in other comprehensive income (5,618)   346   (5,272)
 Purchases, issuances and settlements        
  Purchases  -   -   -
  Issuances  -   -   -
  Sales  -   -   -
  Settlements (11,078)   (42,586)   (53,664)
 Transfers in and/or out of Level 3  -   -   -
Balance at end of period $ 169,605 $ 9,670 $ 179,275