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Schedule IV Reinsurance (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]      
Reinsurance Premiums for Insurance Companies, by Product Segment, Gross Amount $ 76,000,000 $ 76,000,000 $ 74,000,000
Reinsurance Premiums for Insurance Companies, by Product Segment, Amount Ceded to Other Companies 38,048,000,000 39,987,000,000 42,582,000,000
Reinsurance Premiums for Insurance Companies, by Product Segment, Amount Assumed from Other Companies 2,927,573,000,000 2,664,353,000,000 2,540,317,000,000
Reinsurance Premiums for Insurance Companies, by Product Segment, Net Amount 2,889,601,000,000 2,624,442,000,000 2,497,809,000,000
Reinsurance Premiums for Insurance Companies, by Product Segment, Percentage of Amount Assumed to Net 101.31% 101.52% 101.70%
Life Insurance in Force [Member]
      
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]      
Reinsurance Premiums for Insurance Companies, by Product Segment, Gross Amount 76,000,000 76,000,000 74,000,000
Reinsurance Premiums for Insurance Companies, by Product Segment, Amount Ceded to Other Companies 38,048,000,000 39,987,000,000 42,582,000,000
Reinsurance Premiums for Insurance Companies, by Product Segment, Amount Assumed from Other Companies 2,927,573,000,000 2,664,353,000,000 2,540,317,000,000
Reinsurance Premiums for Insurance Companies, by Product Segment, Net Amount 2,889,601,000,000 2,624,442,000,000 2,497,809,000,000
Reinsurance Premiums for Insurance Companies, by Product Segment, Percentage of Amount Assumed to Net 101.31% 101.52% 101.70%
US Segment Reporting Information [Member]
      
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]      
Reinsurance Premiums for Insurance Companies, by Product Segment, Gross Amount 3,800,000 2,600,000 2,700,000
Reinsurance Premiums for Insurance Companies, by Product Segment, Amount Ceded to Other Companies 202,100,000 197,000,000 196,600,000
Reinsurance Premiums for Insurance Companies, by Product Segment, Amount Assumed from Other Companies 4,521,200,000 4,187,100,000 3,991,000,000
Reinsurance Premiums for Insurance Companies, by Product Segment, Net Amount 4,322,900,000 3,992,700,000 3,797,100,000
Reinsurance Premiums for Insurance Companies, by Product Segment, Percentage of Amount Assumed to Net 104.59% 104.87% 105.11%
Canada Segment Reporting Information [Member]
      
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]      
Reinsurance Premiums for Insurance Companies, by Product Segment, Gross Amount 0 0 0
Reinsurance Premiums for Insurance Companies, by Product Segment, Amount Ceded to Other Companies 52,900,000 104,700,000 280,600,000
Reinsurance Premiums for Insurance Companies, by Product Segment, Amount Assumed from Other Companies 968,600,000 940,100,000 1,077,800,000
Reinsurance Premiums for Insurance Companies, by Product Segment, Net Amount 915,700,000 835,300,000 797,200,000
Reinsurance Premiums for Insurance Companies, by Product Segment, Percentage of Amount Assumed to Net 105.78% 112.55% 135.20%
Europe And South Africa Segment Reporting Information [Member]
      
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]      
Reinsurance Premiums for Insurance Companies, by Product Segment, Gross Amount 0 0 0
Reinsurance Premiums for Insurance Companies, by Product Segment, Amount Ceded to Other Companies 29,500,000 30,000,000 32,400,000
Reinsurance Premiums for Insurance Companies, by Product Segment, Amount Assumed from Other Companies 1,338,000,000 1,224,400,000 950,900,000
Reinsurance Premiums for Insurance Companies, by Product Segment, Net Amount 1,308,500,000 1,194,500,000 918,500,000
Reinsurance Premiums for Insurance Companies, by Product Segment, Percentage of Amount Assumed to Net 102.25% 102.50% 103.53%
Asia Pacific Segment Reporting Information [Member]
      
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]      
Reinsurance Premiums for Insurance Companies, by Product Segment, Gross Amount 0 0 0
Reinsurance Premiums for Insurance Companies, by Product Segment, Amount Ceded to Other Companies 41,500,000 36,800,000 31,600,000
Reinsurance Premiums for Insurance Companies, by Product Segment, Amount Assumed from Other Companies 1,391,800,000 1,341,300,000 1,170,700,000
Reinsurance Premiums for Insurance Companies, by Product Segment, Net Amount 1,350,300,000 1,304,500,000 1,139,100,000
Reinsurance Premiums for Insurance Companies, by Product Segment, Percentage of Amount Assumed to Net 103.07% 102.82% 102.77%
Corporate And Other Segment Reporting Information [Member]
      
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]      
Reinsurance Premiums for Insurance Companies, by Product Segment, Gross Amount 0 0 0
Reinsurance Premiums for Insurance Companies, by Product Segment, Amount Ceded to Other Companies 0 0 0
Reinsurance Premiums for Insurance Companies, by Product Segment, Amount Assumed from Other Companies 9,200,000 8,700,000 7,800,000
Reinsurance Premiums for Insurance Companies, by Product Segment, Net Amount 9,200,000 8,700,000 7,800,000
Reinsurance Premiums for Insurance Companies, by Product Segment, Percentage of Amount Assumed to Net 100.00% 100.00% 100.00%
Total Premiums [Member]
      
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]      
Reinsurance Premiums for Insurance Companies, by Product Segment, Gross Amount 3,800,000 2,600,000 2,700,000
Reinsurance Premiums for Insurance Companies, by Product Segment, Amount Ceded to Other Companies 326,000,000 368,500,000 541,200,000
Reinsurance Premiums for Insurance Companies, by Product Segment, Amount Assumed from Other Companies 8,228,800,000 7,701,600,000 7,198,200,000
Reinsurance Premiums for Insurance Companies, by Product Segment, Net Amount $ 7,906,600,000 $ 7,335,700,000 $ 6,659,700,000
Reinsurance Premiums for Insurance Companies, by Product Segment, Percentage of Amount Assumed to Net 104.08% 104.99% 108.09%