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Schedule IV Reinsurance (Details) (USD $) | 12 Months Ended
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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%

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- Definition Amount of premiums assumed from other companies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574992-122915 + Details
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- Definition Gross amount of premium revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574992-122915 + Details
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- Definition Net amount of gross premiums, less premiums ceded to other companies, plus premiums assumed from other companies; which represents the net amount of premium revenue on the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574992-122915 + Details
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