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Investments Changes in Net Unrealized Gains/Losses on Investments (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Alt A Residential Mortgage Backed Securities [Abstract]          
Available-for-sale Debt Securities, Amortized Cost Basis $ 24,789,087,000   $ 24,789,087,000    
Fixed Maturity Securities, Unrealized Loss Position, Classified as Investment Grade 95.00%   95.00%   75.00%
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss) before Taxes (1,349,652,000) 602,675,000 (1,466,503,000) 392,011,000  
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss), Net of Tax (417,383,000) 171,125,000 (442,527,000) 122,643,000  
Adjustment for Effect on Other Balance Sheet Accounts [Abstract]          
Adjustments for Assumed Changes in Amortization of Deferred Policy Acquisition Costs and Deferred Sales Inducements 707,525,000 (339,408,000) 785,693,000 (203,330,000)  
Increase (Decrease) in Deferred Income Taxes 224,744,000 (92,142,000) 238,283,000 (66,038,000)  
Changes Net Unrealized Gains/Losses for Adjustments in Deferred Policy Acquisition Costs, Deferred Sales Inducements, Deferred Tax Valuation Allowances, and Deferred Income Taxes 932,269,000 (431,550,000) 1,023,976,000 (269,368,000)  
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities     2,292,959,000 1,423,179,000  
Fixed Maturities [Member]
          
Alt A Residential Mortgage Backed Securities [Abstract]          
Change in Net Unrealized Gain/Loss, Fixed Maturity Securities, Held for Investment (964,000) 1,690,000 (353,000) 11,879,000  
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss) before Taxes (1,339,484,000) 603,462,000 (1,458,554,000) 388,374,000  
Adjustment for Effect on Other Balance Sheet Accounts [Abstract]          
Proceeds from Sale of Available-for-sale Securities     820,200,000 165,200,000  
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities     1,600,000,000 1,400,000,000  
Equity Securities [Member]
          
Alt A Residential Mortgage Backed Securities [Abstract]          
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss) before Taxes (10,168,000) (787,000) (7,949,000) 3,637,000  
Residential Mortgage Backed Securities, Alt-A Sector [Member] | Residential Mortgage Backed Securities [Member]
          
Alt A Residential Mortgage Backed Securities [Abstract]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 36   36    
Available-for-sale Debt Securities, Amortized Cost Basis 341,400,000   341,400,000    
Available-for-sale Securities, Fair Value Disclosure $ 372,500,000   $ 372,500,000