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Schedule I Summary of Investments (Details) (USD $)
Dec. 31, 2012
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