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INVESTMENT OPERATIONS (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Investments classified as available-for-sale    
Amortized Cost $ 31,936,953 $ 31,600,087
Gross Unrealized Gains 2,442,795 1,728,521
Gross Unrealized Losses (323,467) (604,616)
Fair Value 34,056,281 32,723,992
Total OTTI Recognized in OCI 7,868 928
Investments classified as held-to-maturity    
Fair Value 420,747 335,676
Fair Value    
Fair Value 420,747 335,676
Fixed maturities
   
Investments classified as available-for-sale    
Amortized Cost 31,118,109 30,863,805
Gross Unrealized Gains 2,422,871 1,721,890
Gross Unrealized Losses (302,140) (568,254)
Fair Value 33,238,840 32,017,441
Total OTTI Recognized in OCI 7,868 928
Investments classified as held-to-maturity    
Amortized Cost 385,000 365,000
Gross Unrealized Gains 35,747  
Gross Unrealized Losses 0 (29,324)
Fair Value 420,747 335,676
Trading securities 2,800,000 2,800,000
Amortized Cost    
Due in one year or less 835,262  
Due after one year through five years 6,083,022  
Due after five years through ten years 8,357,580  
Due after ten years 15,842,245  
Total 31,118,109  
Fair Value    
Due in one year or less 848,692  
Due after one year through five years 6,460,856  
Due after five years through ten years 8,689,900  
Due after ten years 17,239,392  
Total 33,238,840  
Amortized Cost    
Due after ten years 385,000  
Total 385,000 365,000
Fair Value    
Due after ten years 420,747  
Fair Value 420,747 335,676
Residential mortgage-backed securities
   
Investments classified as available-for-sale    
Amortized Cost 1,409,310 1,435,477
Gross Unrealized Gains 44,397 34,155
Gross Unrealized Losses (14,934) (24,564)
Fair Value 1,438,773 1,445,068
Total OTTI Recognized in OCI 7,942 979
Commercial mortgage-backed securities
   
Investments classified as available-for-sale    
Amortized Cost 997,605 963,461
Gross Unrealized Gains 36,151 26,900
Gross Unrealized Losses (10,390) (19,705)
Fair Value 1,023,366 970,656
Other asset-backed securities
   
Investments classified as available-for-sale    
Amortized Cost 908,643 926,396
Gross Unrealized Gains 15,971 15,135
Gross Unrealized Losses (63,869) (69,548)
Fair Value 860,745 871,983
Total OTTI Recognized in OCI (74) (51)
U.S. government-related securities
   
Investments classified as available-for-sale    
Amortized Cost 1,508,287 1,529,818
Gross Unrealized Gains 37,403 32,150
Gross Unrealized Losses (34,449) (54,078)
Fair Value 1,511,241 1,507,890
Other government-related securities
   
Investments classified as available-for-sale    
Amortized Cost 48,937 49,171
Gross Unrealized Gains 2,742 2,257
Gross Unrealized Losses (1) (1)
Fair Value 51,678 51,427
States, municipals, and political subdivisions
   
Investments classified as available-for-sale    
Amortized Cost 1,351,460 1,315,457
Gross Unrealized Gains 176,525 103,663
Gross Unrealized Losses (4,045) (8,291)
Fair Value 1,523,940 1,410,829
Corporate bonds
   
Investments classified as available-for-sale    
Amortized Cost 24,893,867 24,644,025
Gross Unrealized Gains 2,109,682 1,507,630
Gross Unrealized Losses (174,452) (392,067)
Fair Value 26,829,097 25,759,588
Other
   
Investments classified as held-to-maturity    
Amortized Cost 385,000 365,000
Gross Unrealized Gains 35,747  
Gross Unrealized Losses   (29,324)
Fair Value 420,747 335,676
Amortized Cost    
Total 385,000 365,000
Fair Value    
Fair Value 420,747 335,676
Equity securities
   
Investments classified as available-for-sale    
Amortized Cost 695,939 654,579
Gross Unrealized Gains 19,924 6,631
Gross Unrealized Losses (21,327) (36,362)
Fair Value 694,536 624,848
Investments classified as held-to-maturity    
Trading securities 22,400 21,200
Short-term investments
   
Investments classified as available-for-sale    
Amortized Cost 122,905 81,703
Fair Value 122,905 81,703
Investments classified as held-to-maturity    
Trading securities $ 71,400 $ 52,400