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INVESTMENT OPERATIONS (Details 2) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Investments classified as available-for-sale    
Amortized Cost $ 24,816,853 $ 24,162,714
Gross Unrealized Gains 1,795,367 3,249,825
Gross Unrealized Losses (521,478) (140,780)
Fair Value 26,090,742 27,271,759
Total OTTI Recognized in OCI (2,182) (6,134)
Investments classified as held-to-maturity    
Fair Value 341,797 319,163
Fair Value    
Fair Value 341,797 319,163
Fixed maturities
   
Investments classified as available-for-sale    
Amortized Cost 24,242,198 23,674,016
Gross Unrealized Gains 1,789,897 3,237,382
Gross Unrealized Losses (491,659) (130,747)
Fair Value 25,540,436 26,780,651
Total OTTI Recognized in OCI (2,288) (6,134)
Investments classified as held-to-maturity    
Amortized Cost 350,000 300,000
Gross Unrealized Gains   19,163
Gross Unrealized Losses (8,203)  
Fair Value 341,797 319,163
Trading securities 2,800,000 3,000,000
Amortized Cost    
Due in one year or less 554,918  
Due after one year through five years 3,234,475  
Due after five years through ten years 7,559,566  
Due after ten years 12,893,239  
Total 24,242,198  
Fair Value    
Due in one year or less 569,362  
Due after one year through five years 3,515,816  
Due after five years through ten years 7,882,075  
Due after ten years 13,573,183  
Total 25,540,436  
Amortized Cost    
Due after ten years 350,000  
Total 350,000 300,000
Fair Value    
Due after ten years 341,797  
Fair Value 341,797 319,163
Residential mortgage-backed securities
   
Investments classified as available-for-sale    
Amortized Cost 1,438,409 1,766,440
Gross Unrealized Gains 47,935 92,265
Gross Unrealized Losses (22,317) (19,375)
Fair Value 1,464,027 1,839,330
Total OTTI Recognized in OCI (914) (406)
Commercial mortgage-backed securities
   
Investments classified as available-for-sale    
Amortized Cost 898,377 797,844
Gross Unrealized Gains 30,287 72,577
Gross Unrealized Losses (17,057) (598)
Fair Value 911,607 869,823
Other asset-backed securities
   
Investments classified as available-for-sale    
Amortized Cost 928,367 1,023,649
Gross Unrealized Gains 15,532 12,788
Gross Unrealized Losses (66,735) (61,424)
Fair Value 877,164 975,013
Total OTTI Recognized in OCI (66) (241)
U.S. government-related securities
   
Investments classified as available-for-sale    
Amortized Cost 1,204,908 1,099,001
Gross Unrealized Gains 38,525 71,537
Gross Unrealized Losses (29,997) (595)
Fair Value 1,213,436 1,169,943
Other government-related securities
   
Investments classified as available-for-sale    
Amortized Cost 38,406 93,565
Gross Unrealized Gains 2,722 7,258
Gross Unrealized Losses   (45)
Fair Value 41,128 100,778
States, municipals, and political subdivisions
   
Investments classified as available-for-sale    
Amortized Cost 1,191,736 1,188,077
Gross Unrealized Gains 114,900 255,900
Gross Unrealized Losses (6,259) (264)
Fair Value 1,300,377 1,443,713
Corporate bonds
   
Investments classified as available-for-sale    
Amortized Cost 18,541,995 17,705,440
Gross Unrealized Gains 1,539,996 2,725,057
Gross Unrealized Losses (349,294) (48,446)
Fair Value 19,732,697 20,382,051
Total OTTI Recognized in OCI (1,308) (5,487)
Other
   
Investments classified as held-to-maturity    
Amortized Cost 350,000 300,000
Gross Unrealized Gains   19,163
Gross Unrealized Losses (8,203)  
Fair Value 341,797 319,163
Amortized Cost    
Total 350,000 300,000
Fair Value    
Fair Value 341,797 319,163
Equity securities
   
Investments classified as available-for-sale    
Amortized Cost 464,862 389,821
Gross Unrealized Gains 5,470 12,443
Gross Unrealized Losses (29,819) (10,033)
Fair Value 440,513 392,231
Total OTTI Recognized in OCI 106  
Investments classified as held-to-maturity    
Trading securities 20,700 19,600
Short-term investments
   
Investments classified as available-for-sale    
Amortized Cost 109,793 98,877
Fair Value 109,793 98,877
Investments classified as held-to-maturity    
Trading securities $ 106,400 $ 118,900