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Schedule I Summary of Investments (Details) (USD $) | Dec. 31, 2012
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Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Summary of Investments, Other than Investments in Related Parties, Cost | $ 30,174,000,000
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 32,912,000,000
Fixed Maturities [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Summary of Investments, Other than Investments in Related Parties, Cost | 19,560,000,000
Summary of Investments, Other than Investments in Related Parties, Fair Value | 22,292,000,000
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 22,292,000,000
US Government and Government Agencies and Authorities [Member] | Fixed Maturities [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Summary of Investments, Other than Investments in Related Parties, Cost | 231,000,000
Summary of Investments, Other than Investments in Related Parties, Fair Value | 265,000,000
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 265,000,000
US States and Political Subdivisions Debt Securities [Member] | Fixed Maturities [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Summary of Investments, Other than Investments in Related Parties, Cost | 270,000,000
Summary of Investments, Other than Investments in Related Parties, Fair Value | 303,000,000
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 303,000,000
Foreign Government Debt [Member] | Fixed Maturities [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Summary of Investments, Other than Investments in Related Parties, Cost | 4,447,000,000
Summary of Investments, Other than Investments in Related Parties, Fair Value | 5,911,000,000
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 5,911,000,000
Public Utility, Bonds [Member] | Fixed Maturities [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Summary of Investments, Other than Investments in Related Parties, Cost | 1,800,000,000
Summary of Investments, Other than Investments in Related Parties, Fair Value | 2,003,000,000
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 2,003,000,000
Asset-backed Securities [Member] | Fixed Maturities [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Summary of Investments, Other than Investments in Related Parties, Cost | 3,278,000,000
Summary of Investments, Other than Investments in Related Parties, Fair Value | 3,433,000,000
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 3,433,000,000
All Other Corporate Bonds [Member] | Fixed Maturities [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Summary of Investments, Other than Investments in Related Parties, Cost | 9,534,000,000
Summary of Investments, Other than Investments in Related Parties, Fair Value | 10,377,000,000
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 10,377,000,000
Equity Securities [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Summary of Investments, Other than Investments in Related Parties, Cost | 68,000,000
Summary of Investments, Other than Investments in Related Parties, Fair Value | 75,000,000
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 75,000,000
Nonredeemable Preferred Stock [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Summary of Investments, Other than Investments in Related Parties, Cost | 149,000,000
Summary of Investments, Other than Investments in Related Parties, Fair Value | 148,000,000
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 148,000,000
Mortgage Loans on Real Estate [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Summary of Investments, Other than Investments in Related Parties, Cost | 2,300,000,000
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 2,300,000,000
Policy Loans [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Summary of Investments, Other than Investments in Related Parties, Cost | 1,278,000,000
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 1,278,000,000
Funds Withheld At Interest [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Summary of Investments, Other than Investments in Related Parties, Cost | 5,594,000,000
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 5,594,000,000
Short-term Investments [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Summary of Investments, Other than Investments in Related Parties, Cost | 288,000,000
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 288,000,000
Other Invested Assets [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Summary of Investments, Other than Investments in Related Parties, Cost | 937,000,000
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | $ 937,000,000

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- Definition This element represents the carrying (reported) amount of the entity's investments as of the balance sheet date. This amount may represent the individual investment's or group of similar investments' original cost, fair value, or such other amount at which the investment is shown in the entity's balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 15 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 7 -Subparagraph (SX 210.12-15) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611379-123010 + Details
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- Definition This item represents the original cost of the entity's investments including investments in equity securities and, as to fixed maturities, original cost reduced by repayments and adjusted for amortization of premiums or accrual of discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 15 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 7 -Subparagraph (SX 210.12-15) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611379-123010 + Details
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