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Investments Schedule of Amortized Cost and Fair Value of Fixed Maturity and Equity Securities (Details) (USD $)
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Investment Holdings [Line Items]      
Proceeds From Calls of United States Government Sponsored Agency Securities $ 2,800,000,000 $ 2,900,000,000  
Held-to-maturity Securities 1,000,024,000   2,644,206,000
Procceds From Calls of United States Sponsored Agency Securites, Held for Investment 1,700,000,000    
Fixed Income Securities with Call Features 33.00%    
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 14.00%    
Fixed Income Securities with Call Features, Callable During Next 12 Months Amount 2,600,000,000    
Fixed Maturities [Member] | Held-to-maturity Securities [Member]
     
Investment Holdings [Line Items]      
Held-to-maturity Securities 1,000,024,000   2,644,206,000
Held-to-maturity Securities, Unrecognized Holding Gain 2,507,000   16,806,000
Held-to-maturity Securities, Unrecognized Holding Loss (14,170,000)   (16,590,000)
Held-to-maturity Securities, Fair Value Disclosure 988,361,000   2,644,422,000
Fixed Maturities [Member] | Held-to-maturity Securities [Member] | Corporate Debt Securities [Member]
     
Investment Holdings [Line Items]      
Held-to-maturity Securities 76,009,000   75,932,000
Held-to-maturity Securities, Unrecognized Holding Gain 0   0
Held-to-maturity Securities, Unrecognized Holding Loss (14,170,000)   (16,590,000)
Held-to-maturity Securities, Fair Value Disclosure 61,839,000   59,342,000
Fixed Maturities [Member] | Held-to-maturity Securities [Member] | US Government Corporations and Agencies Securities [Member]
     
Investment Holdings [Line Items]      
Held-to-maturity Securities 924,015,000   2,568,274,000
Held-to-maturity Securities, Unrecognized Holding Gain 2,507,000   16,806,000
Held-to-maturity Securities, Unrecognized Holding Loss 0   0
Held-to-maturity Securities, Fair Value Disclosure 926,522,000   2,585,080,000
Fixed Maturities [Member] | Available-for-sale Securities [Member]
     
Investment Holdings [Line Items]      
Available-for-sale Securities, Amortized Cost Basis 19,083,027,000   16,980,279,000
Available-for-sale Securities, Gross Unrealized Gains 1,981,628,000   1,641,766,000
Available-for-sale Securities, Gross Unrealized Losses (109,424,000)   (157,936,000)
Available-for-sale Securities, Fair Value Disclosure 20,955,231,000   18,464,109,000
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 3,052,875,000   2,981,699,000
Available-for-sale Securities, Gross Unrealized Gains 442,716,000   351,694,000
Available-for-sale Securities, Gross Unrealized Losses (34,000)   (10,000)
Available-for-sale Securities, Fair Value Disclosure 3,495,557,000   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 36,402,000   36,373,000
Available-for-sale Securities, Gross Unrealized Gains 9,784,000   6,855,000
Available-for-sale Securities, Gross Unrealized Losses 0   0
Available-for-sale Securities, Fair Value Disclosure 46,186,000   43,228,000
Fixed Maturities [Member] | Available-for-sale Securities [Member] | US Treasury Securities [Member]
     
Investment Holdings [Line Items]      
Available-for-sale Securities, Amortized Cost Basis 4,589,000   4,084,000
Available-for-sale Securities, Gross Unrealized Gains 625,000   594,000
Available-for-sale Securities, Gross Unrealized Losses 0   0
Available-for-sale Securities, Fair Value Disclosure 5,214,000   4,678,000
Fixed Maturities [Member] | Available-for-sale Securities [Member] | Corporate Debt Securities [Member]
     
Investment Holdings [Line Items]      
Available-for-sale Securities, Amortized Cost Basis 11,166,677,000   9,117,173,000
Available-for-sale Securities, Gross Unrealized Gains 1,301,788,000   1,079,422,000
Available-for-sale Securities, Gross Unrealized Losses (50,330,000)   (80,234,000)
Available-for-sale Securities, Fair Value Disclosure 12,418,135,000   10,116,361,000
Fixed Maturities [Member] | Available-for-sale Securities [Member] | Residential Mortgage Backed Securities [Member]
     
Investment Holdings [Line Items]      
Available-for-sale Securities, Amortized Cost Basis 2,407,618,000   2,618,040,000
Available-for-sale Securities, Gross Unrealized Gains 170,617,000   157,331,000
Available-for-sale Securities, Gross Unrealized Losses (54,205,000)   (72,081,000)
Available-for-sale Securities, Fair Value Disclosure 2,524,030,000   2,703,290,000
Fixed Maturities [Member] | Available-for-sale Securities [Member] | Asset-backed Securities [Member]
     
Investment Holdings [Line Items]      
Available-for-sale Securities, Amortized Cost Basis 736,101,000   442,509,000
Available-for-sale Securities, Gross Unrealized Gains 29,674,000   26,492,000
Available-for-sale Securities, Gross Unrealized Losses (4,182,000)   (5,611,000)
Available-for-sale Securities, Fair Value Disclosure 761,593,000   463,390,000
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 1,678,765,000   1,780,401,000
Available-for-sale Securities, Gross Unrealized Gains 26,424,000   19,378,000
Available-for-sale Securities, Gross Unrealized Losses (673,000)   0
Available-for-sale Securities, Fair Value Disclosure 1,704,516,000   1,799,779,000
Equity Securities [Member] | Available-for-sale Securities [Member]
     
Investment Holdings [Line Items]      
Available-for-sale Securities, Amortized Cost Basis 53,397,000   58,438,000
Available-for-sale Securities, Gross Unrealized Gains 9,347,000   8,752,000
Available-for-sale Securities, Gross Unrealized Losses (1,303,000)   (4,345,000)
Available-for-sale Securities, Fair Value Disclosure $ 61,441,000   $ 62,845,000