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INVESTMENT OPERATIONS (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Investments classified as available-for-sale    
Amortized Cost $ 31,600,087 $ 24,162,714
Gross Unrealized Gains 1,728,521 3,249,825
Gross Unrealized Losses (604,616) (140,780)
Fair Value 32,723,992 27,271,759
Total OTTI Recognized in OCI 928 (6,134)
Investments classified as held-to-maturity    
Fair Value 335,676 319,163
Fair Value    
Fair Value 335,676 319,163
Fixed maturities
   
Investments classified as available-for-sale    
Amortized Cost 30,863,805 23,674,016
Gross Unrealized Gains 1,721,890 3,237,382
Gross Unrealized Losses (568,254) (130,747)
Fair Value 32,017,441 26,780,651
Total OTTI Recognized in OCI 928 (6,134)
Investments classified as held-to-maturity    
Amortized Cost 365,000 300,000
Gross Unrealized Gains   19,163
Gross Unrealized Losses (29,324)  
Fair Value 335,676 319,163
Trading securities 2,800,000 3,000,000
Amortized Cost    
Due in one year or less 1,016,117  
Due after one year through five years 4,987,917  
Due after five years through ten years 9,085,348  
Due after ten years 15,774,423  
Total 30,863,805  
Fair Value    
Due in one year or less 1,033,834  
Due after one year through five years 5,251,806  
Due after five years through ten years 9,334,786  
Due after ten years 16,397,015  
Total 32,017,441  
Amortized Cost    
Due after ten years 365,000  
Total 365,000 300,000
Fair Value    
Due after ten years 335,676  
Fair Value 335,676 319,163
Residential mortgage-backed securities
   
Investments classified as available-for-sale    
Amortized Cost 1,435,477 1,766,440
Gross Unrealized Gains 34,155 92,265
Gross Unrealized Losses (24,564) (19,375)
Fair Value 1,445,068 1,839,330
Total OTTI Recognized in OCI 979 (406)
Commercial mortgage-backed securities
   
Investments classified as available-for-sale    
Amortized Cost 963,461 797,844
Gross Unrealized Gains 26,900 72,577
Gross Unrealized Losses (19,705) (598)
Fair Value 970,656 869,823
Other asset-backed securities
   
Investments classified as available-for-sale    
Amortized Cost 926,396 1,023,649
Gross Unrealized Gains 15,135 12,788
Gross Unrealized Losses (69,548) (61,424)
Fair Value 871,983 975,013
Total OTTI Recognized in OCI (51) (241)
U.S. government-related securities
   
Investments classified as available-for-sale    
Amortized Cost 1,529,818 1,099,001
Gross Unrealized Gains 32,150 71,537
Gross Unrealized Losses (54,078) (595)
Fair Value 1,507,890 1,169,943
Other government-related securities
   
Investments classified as available-for-sale    
Amortized Cost 49,171 93,565
Gross Unrealized Gains 2,257 7,258
Gross Unrealized Losses (1) (45)
Fair Value 51,427 100,778
States, municipals, and political subdivisions
   
Investments classified as available-for-sale    
Amortized Cost 1,315,457 1,188,077
Gross Unrealized Gains 103,663 255,900
Gross Unrealized Losses (8,291) (264)
Fair Value 1,410,829 1,443,713
Corporate bonds
   
Investments classified as available-for-sale    
Amortized Cost 24,644,025 17,705,440
Gross Unrealized Gains 1,507,630 2,725,057
Gross Unrealized Losses (392,067) (48,446)
Fair Value 25,759,588 20,382,051
Total OTTI Recognized in OCI   (5,487)
Other
   
Investments classified as held-to-maturity    
Amortized Cost 365,000 300,000
Gross Unrealized Gains   19,163
Gross Unrealized Losses (29,324)  
Fair Value 335,676 319,163
Amortized Cost    
Total 365,000 300,000
Fair Value    
Fair Value 335,676 319,163
Equity securities
   
Investments classified as available-for-sale    
Amortized Cost 654,579 389,821
Gross Unrealized Gains 6,631 12,443
Gross Unrealized Losses (36,362) (10,033)
Fair Value 624,848 392,231
Investments classified as held-to-maturity    
Trading securities 21,200 19,600
Short-term investments
   
Investments classified as available-for-sale    
Amortized Cost 81,703 98,877
Fair Value 81,703 98,877
Investments classified as held-to-maturity    
Trading securities $ 52,400 $ 118,900