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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

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