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Investments Schedule of Amortized Cost and Fair Value of Fixed Maturity and Equity Securities (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Investment Holdings [Line Items]    
Proceeds From Calls of United States Government Sponsored Agency Securities $ 4,600,000,000 $ 3,200,000,000
Available-for-sale Securities, Amortized Cost Basis 21,957,027,000 16,980,279,000
Fixed maturity securities, held for investment, at amortized cost 76,088,000 2,644,206,000
Procceds From Calls of United States Sponsored Agency Securites, Held for Investment 2,600,000,000 200,000,000
Fixed Income Securities with Call Features 28.00%  
Fixed Income Securities with Call Features, Currently Callable 0.40%  
Fixed Income Securities with Call Features, Currently Callable Amount 100,000,000  
Fixed Income Securities with Call Features, Callable During Next 12 Months 7.00%  
Fixed Income Securities with Call Features, Callable During Next 12 Months Amount 1,500,000,000  
United States Government Agency Securities, Short-term, Callable During Next 12 Months 727,000,000  
United States Government Agencies, Short-term, Callable During Next 12 Months, Book Yield 0.85%  
Fixed Maturities [Member] | Held-to-maturity Securities [Member]
   
Investment Holdings [Line Items]    
Fixed maturity securities, held for investment, at amortized cost   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] | Corporate Debt Securities [Member]
   
Investment Holdings [Line Items]    
Fixed maturity securities, held for investment, at amortized cost 76,088,000 75,932,000
Held-to-maturity Securities, Unrecognized Holding Gain 0 0
Held-to-maturity Securities, Unrecognized Holding Loss (14,567,000) (16,590,000)
Held-to-maturity Securities, Fair Value Disclosure 61,521,000 59,342,000
Fixed Maturities [Member] | Held-to-maturity Securities [Member] | US Government Corporations and Agencies Securities [Member]
   
Investment Holdings [Line Items]    
Fixed maturity securities, held for investment, at amortized cost   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] | Available-for-sale Securities [Member]
   
Investment Holdings [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 21,957,027,000 16,980,279,000
Available-for-sale Securities, Gross Unrealized Gains 2,283,010,000 1,641,766,000
Available-for-sale Securities, Gross Unrealized Losses (67,901,000) (157,936,000)
Available-for-sale Securities, Fair Value Disclosure 24,172,136,000 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 3,116,678,000 2,981,699,000
Available-for-sale Securities, Gross Unrealized Gains 461,770,000 351,694,000
Available-for-sale Securities, Gross Unrealized Losses (125,000) (10,000)
Available-for-sale Securities, Fair Value Disclosure 3,578,323,000 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 86,099,000 60,809,000
Available-for-sale Securities, Gross Unrealized Gains 19,160,000 7,766,000
Available-for-sale Securities, Gross Unrealized Losses 0 (242,000)
Available-for-sale Securities, Fair Value Disclosure 105,259,000 68,333,000
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 564,000 594,000
Available-for-sale Securities, Gross Unrealized Losses 0 0
Available-for-sale Securities, Fair Value Disclosure 5,154,000 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 12,930,173,000 9,092,737,000
Available-for-sale Securities, Gross Unrealized Gains 1,568,223,000 1,078,511,000
Available-for-sale Securities, Gross Unrealized Losses (31,624,000) (79,992,000)
Available-for-sale Securities, Fair Value Disclosure 14,466,772,000 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 2,743,537,000 2,618,040,000
Available-for-sale Securities, Gross Unrealized Gains 172,304,000 157,331,000
Available-for-sale Securities, Gross Unrealized Losses (27,728,000) (72,081,000)
Available-for-sale Securities, Fair Value Disclosure 2,888,113,000 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 354,870,000  
Available-for-sale Securities, Gross Unrealized Gains 5,095,000  
Available-for-sale Securities, Gross Unrealized Losses (1,983,000)  
Available-for-sale Securities, Fair Value Disclosure 357,982,000  
Fixed Maturities [Member] | Available-for-sale Securities [Member] | Asset-backed Securities [Member]
   
Investment Holdings [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 957,291,000 442,509,000
Available-for-sale Securities, Gross Unrealized Gains 44,190,000 26,492,000
Available-for-sale Securities, Gross Unrealized Losses (2,973,000) (5,611,000)
Available-for-sale Securities, Fair Value Disclosure 998,508,000 463,390,000
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 1,763,789,000 1,780,401,000
Available-for-sale Securities, Gross Unrealized Gains 11,704,000 19,378,000
Available-for-sale Securities, Gross Unrealized Losses (3,468,000) 0
Available-for-sale Securities, Fair Value Disclosure 1,772,025,000 1,799,779,000
Equity Securities [Member] | Available-for-sale Securities [Member]
   
Investment Holdings [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 44,598,000 58,438,000
Available-for-sale Securities, Gross Unrealized Gains 10,227,000 8,752,000
Available-for-sale Securities, Gross Unrealized Losses (1,403,000) (4,345,000)
Available-for-sale Securities, Fair Value Disclosure $ 53,422,000 $ 62,845,000