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Investments Schedule of Amortized Cost and Fair Value of Fixed Maturity and Equity Securities (Details) (USD $)
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Investment Holdings [Line Items]      
Proceeds From Calls of United States Government Sponsored Agency Securities $ 3,800,000,000 $ 2,900,000,000  
Held-to-maturity Securities 76,048,000   2,644,206,000
Procceds From Calls of United States Sponsored Agency Securites, Held for Investment 2,600,000,000    
Fixed Income Securities with Call Features 30.00%    
Fixed Income Securities with Call Features, Currently Callable 1.00%    
Fixed Income Securities with Call Features, Currently Callable Amount 100,000,000    
Fixed Income Securities with Call Features, Callable During Next 12 Months 10.00%    
Fixed Income Securities with Call Features, Callable During Next 12 Months Amount 1,900,000,000    
Fixed Maturities [Member] | Held-to-maturity Securities [Member]
     
Investment Holdings [Line Items]      
Held-to-maturity Securities     2,644,206,000
Held-to-maturity Securities, Unrecognized Holding Gain     16,806,000
Held-to-maturity Securities, Unrecognized Holding Loss     (16,590,000)
Held-to-maturity Securities, Fair Value Disclosure     2,644,422,000
Fixed Maturities [Member] | Held-to-maturity Securities [Member] | US Government Corporations and Agencies Securities [Member]
     
Investment Holdings [Line Items]      
Held-to-maturity Securities     2,568,274,000
Held-to-maturity Securities, Unrecognized Holding Gain     16,806,000
Held-to-maturity Securities, Unrecognized Holding Loss     0
Held-to-maturity Securities, Fair Value Disclosure     2,585,080,000
Fixed Maturities [Member] | Held-to-maturity Securities [Member] | Corporate Debt Securities [Member]
     
Investment Holdings [Line Items]      
Held-to-maturity Securities 76,048,000   75,932,000
Held-to-maturity Securities, Unrecognized Holding Gain 0   0
Held-to-maturity Securities, Unrecognized Holding Loss (12,289,000)   (16,590,000)
Held-to-maturity Securities, Fair Value Disclosure 63,759,000   59,342,000
Fixed Maturities [Member] | Available-for-sale Securities [Member]
     
Investment Holdings [Line Items]      
Available-for-sale Securities, Amortized Cost Basis 20,136,014,000   16,980,279,000
Available-for-sale Securities, Gross Unrealized Gains 2,344,791,000   1,641,766,000
Available-for-sale Securities, Gross Unrealized Losses (70,313,000)   (157,936,000)
Available-for-sale Securities, Fair Value Disclosure 22,410,492,000   18,464,109,000
Fixed Maturities [Member] | Available-for-sale Securities [Member] | US Treasury Securities [Member]
     
Investment Holdings [Line Items]      
Available-for-sale Securities, Amortized Cost Basis 4,590,000   4,084,000
Available-for-sale Securities, Gross Unrealized Gains 615,000   594,000
Available-for-sale Securities, Gross Unrealized Losses 0   0
Available-for-sale Securities, Fair Value Disclosure 5,205,000   4,678,000
Fixed Maturities [Member] | Available-for-sale Securities [Member] | US Government Corporations and Agencies Securities [Member]
     
Investment Holdings [Line Items]      
Available-for-sale Securities, Amortized Cost Basis 1,939,562,000   1,780,401,000
Available-for-sale Securities, Gross Unrealized Gains 19,661,000   19,378,000
Available-for-sale Securities, Gross Unrealized Losses (486,000)   0
Available-for-sale Securities, Fair Value Disclosure 1,958,737,000   1,799,779,000
Fixed Maturities [Member] | Available-for-sale Securities [Member] | US States and Political Subdivisions Debt Securities [Member]
     
Investment Holdings [Line Items]      
Available-for-sale Securities, Amortized Cost Basis 3,096,008,000   2,981,699,000
Available-for-sale Securities, Gross Unrealized Gains 475,456,000   351,694,000
Available-for-sale Securities, Gross Unrealized Losses (2,000)   (10,000)
Available-for-sale Securities, Fair Value Disclosure 3,571,462,000   3,333,383,000
Fixed Maturities [Member] | Available-for-sale Securities [Member] | Foreign Government Debt Securities [Member]
     
Investment Holdings [Line Items]      
Available-for-sale Securities, Amortized Cost Basis 81,126,000   60,809,000
Available-for-sale Securities, Gross Unrealized Gains 17,699,000   7,766,000
Available-for-sale Securities, Gross Unrealized Losses 0   (242,000)
Available-for-sale Securities, Fair Value Disclosure 98,825,000   68,333,000
Fixed Maturities [Member] | Available-for-sale Securities [Member] | Corporate Debt Securities [Member]
     
Investment Holdings [Line Items]      
Available-for-sale Securities, Amortized Cost Basis 11,652,586,000   9,092,737,000
Available-for-sale Securities, Gross Unrealized Gains 1,617,343,000   1,078,511,000
Available-for-sale Securities, Gross Unrealized Losses (26,930,000)   (79,992,000)
Available-for-sale Securities, Fair Value Disclosure 13,242,999,000   10,091,256,000
Fixed Maturities [Member] | Available-for-sale Securities [Member] | Residential Mortgage Backed Securities [Member]
     
Investment Holdings [Line Items]      
Available-for-sale Securities, Amortized Cost Basis 2,433,080,000   2,618,040,000
Available-for-sale Securities, Gross Unrealized Gains 173,881,000   157,331,000
Available-for-sale Securities, Gross Unrealized Losses (41,002,000)   (72,081,000)
Available-for-sale Securities, Fair Value Disclosure 2,565,959,000   2,703,290,000
Fixed Maturities [Member] | Available-for-sale Securities [Member] | Commercial Mortgage Backed Securities [Member]
     
Investment Holdings [Line Items]      
Available-for-sale Securities, Amortized Cost Basis 78,682,000    
Available-for-sale Securities, Gross Unrealized Gains 260,000    
Available-for-sale Securities, Gross Unrealized Losses (30,000)    
Available-for-sale Securities, Fair Value Disclosure 78,912,000    
Fixed Maturities [Member] | Available-for-sale Securities [Member] | Asset-backed Securities [Member]
     
Investment Holdings [Line Items]      
Available-for-sale Securities, Amortized Cost Basis 850,380,000   442,509,000
Available-for-sale Securities, Gross Unrealized Gains 39,876,000   26,492,000
Available-for-sale Securities, Gross Unrealized Losses (1,863,000)   (5,611,000)
Available-for-sale Securities, Fair Value Disclosure 888,393,000   463,390,000
Equity Securities [Member] | Available-for-sale Securities [Member]
     
Investment Holdings [Line Items]      
Available-for-sale Securities, Amortized Cost Basis 50,597,000   58,438,000
Available-for-sale Securities, Gross Unrealized Gains 12,164,000   8,752,000
Available-for-sale Securities, Gross Unrealized Losses (1,157,000)   (4,345,000)
Available-for-sale Securities, Fair Value Disclosure $ 61,604,000   $ 62,845,000