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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

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