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- Quantitative Information About Level 3 Fair Value Inputs (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Minimum
    
Quantitative Information About Level 3 Fair Value Measurements    
Discount factor (as a percent) 0.00% 0.00%
Maximum
    
Quantitative Information About Level 3 Fair Value Measurements    
Discount factor (as a percent) 3.97% 4.44%
Corporate securities | Discounted cash flow | Weighted Average
    
Quantitative Information About Level 3 Fair Value Measurements    
Yield (as a percent) 8.00%  
Asset-backed securities | Corporate securities | Discounted cash flow | Weighted Average
    
Quantitative Information About Level 3 Fair Value Measurements    
Yield (as a percent)   8.30%
Asset-backed securities | Investor Owned Utilities [Member]
    
Quantitative Information About Level 3 Fair Value Measurements    
Fair value of assets as of the balance sheet date $ 119,000,000 $ 141,000,000
Asset-backed securities | Investor Owned Utilities [Member] | Discounted cash flow | Minimum
    
Quantitative Information About Level 3 Fair Value Measurements    
Collateral recovery period (in years) 9 months 12 months
Liquidation value 177,000,000 195,000,000
Years to liquidation 0 years 0 years
Asset-backed securities | Investor Owned Utilities [Member] | Discounted cash flow | Maximum
    
Quantitative Information About Level 3 Fair Value Measurements    
Collateral recovery period (in years) 5 years 6 years
Liquidation value 274,000,000 245,000,000
Years to liquidation 3 years 3 years
Asset-backed securities | Investor Owned Utilities [Member] | Discounted cash flow | Weighted Average
    
Quantitative Information About Level 3 Fair Value Measurements    
Discount factor (as a percent) 7.00% 15.30%
Asset-backed securities | XXX life insurance transactions
    
Quantitative Information About Level 3 Fair Value Measurements    
Fair value of assets as of the balance sheet date 133,000,000 127,000,000
Asset-backed securities | XXX life insurance transactions | Discounted cash flow | Weighted Average
    
Quantitative Information About Level 3 Fair Value Measurements    
Yield (as a percent) 12.50% 12.50%
Fixed maturity securities | Corporate securities
    
Quantitative Information About Level 3 Fair Value Measurements    
Fair value of assets as of the balance sheet date 138,000,000 136,000,000
Fixed maturity securities | RMBS
    
Quantitative Information About Level 3 Fair Value Measurements    
Fair value of assets as of the balance sheet date 359,000,000 290,000,000
Fixed maturity securities | RMBS | Discounted cash flow | Minimum
    
Quantitative Information About Level 3 Fair Value Measurements    
CPR (as a percent) 0.30% 1.00%
CDR (as a percent) 4.10% 5.00%
Loss severity rate (as a percent) 48.10% 48.10%
Yield (as a percent) 2.60% 2.50%
Fixed maturity securities | RMBS | Discounted cash flow | Maximum
    
Quantitative Information About Level 3 Fair Value Measurements    
CPR (as a percent) 15.80% 15.80%
CDR (as a percent) 25.80% 25.80%
Loss severity rate (as a percent) 101.80% 102.50%
Yield (as a percent) 8.70% 9.40%
Fixed maturity securities | Obligations of state and political subdivisions
    
Quantitative Information About Level 3 Fair Value Measurements    
Fair value of assets as of the balance sheet date 38,000,000 36,000,000
Fixed maturity securities | Obligations of state and political subdivisions | Discounted cash flow | Minimum
    
Quantitative Information About Level 3 Fair Value Measurements    
Rate of inflation 1.00% 1.00%
Cash flow receipts (as a percent) 0.50% 0.50%
Discount factor (as a percent) 4.60% 4.60%
Collateral recovery period (in years) 4 months 1 month
Fixed maturity securities | Obligations of state and political subdivisions | Discounted cash flow | Maximum
    
Quantitative Information About Level 3 Fair Value Measurements    
Rate of inflation 3.00% 3.00%
Cash flow receipts (as a percent) 62.30% 60.90%
Discount factor (as a percent) 9.00% 9.00%
Collateral recovery period (in years) 34 years 10 years
Other invested assets
    
Quantitative Information About Level 3 Fair Value Measurements    
Fair value of assets as of the balance sheet date 54,000,000 8,000,000
Other invested assets | Discounted cash flow | Minimum
    
Quantitative Information About Level 3 Fair Value Measurements    
Loss severity rate (as a percent) 40.00% 40.00%
Liquidity discount (as a percent) 10.00% 10.00%
Recovery on delinquent loans (as a percent) 20.00% 20.00%
Default rates (as a percent) 0.00% 1.00%
Prepayment speeds 6.00% 6.00%
Net asset value (per share) $ 1,010  
Other invested assets | Discounted cash flow | Maximum
    
Quantitative Information About Level 3 Fair Value Measurements    
Loss severity rate (as a percent) 90.00% 90.00%
Liquidity discount (as a percent) 20.00% 20.00%
Recovery on delinquent loans (as a percent) 60.00% 60.00%
Default rates (as a percent) 10.00% 10.00%
Prepayment speeds 15.00% 15.00%
Net asset value (per share) $ 1,020  
Other assets
    
Quantitative Information About Level 3 Fair Value Measurements    
Fair value of assets as of the balance sheet date 37,000,000 46,000,000
Other assets | Discounted cash flow | Minimum
    
Quantitative Information About Level 3 Fair Value Measurements    
Quotes from third party pricing 53 47
Other assets | Discounted cash flow | Maximum
    
Quantitative Information About Level 3 Fair Value Measurements    
Quotes from third party pricing 57 53
Other assets | Discounted cash flow | Weighted Average
    
Quantitative Information About Level 3 Fair Value Measurements    
Term (in years) 5 years 5 years
Financial guaranty variable interest entities | Liabilities
    
Quantitative Information About Level 3 Fair Value Measurements    
Fair value of liabilities as of the balance sheet date (1,447,000,000) (2,871,000,000)
Financial guaranty variable interest entities | Liabilities | Discounted cash flow | Minimum
    
Quantitative Information About Level 3 Fair Value Measurements    
CPR (as a percent) 0.30% 0.30%
CDR (as a percent) 3.00% 3.00%
Loss severity rate (as a percent) 38.10% 37.50%
Yield (as a percent) 3.50% 3.50%
Financial guaranty variable interest entities | Liabilities | Discounted cash flow | Maximum
    
Quantitative Information About Level 3 Fair Value Measurements    
CPR (as a percent) 11.80% 11.80%
CDR (as a percent) 25.80% 25.80%
Loss severity rate (as a percent) 102.00% 102.00%
Yield (as a percent) 12.00% 10.20%
Financial guaranty variable interest entities | Assets
    
Quantitative Information About Level 3 Fair Value Measurements    
Fair value of assets as of the balance sheet date 1,257,000,000 2,565,000,000
Financial guaranty variable interest entities | Assets | Discounted cash flow | Minimum
    
Quantitative Information About Level 3 Fair Value Measurements    
CPR (as a percent) 0.30% 0.30%
CDR (as a percent) 3.00% 3.00%
Loss severity rate (as a percent) 38.10% 37.50%
Yield (as a percent) 3.50% 3.50%
Financial guaranty variable interest entities | Assets | Discounted cash flow | Maximum
    
Quantitative Information About Level 3 Fair Value Measurements    
CPR (as a percent) 11.80% 11.80%
CDR (as a percent) 25.80% 25.80%
Loss severity rate (as a percent) 102.00% 102.00%
Yield (as a percent) 12.00% 10.20%
Credit derivatives | Derivative liabilities, net
    
Quantitative Information About Level 3 Fair Value Measurements    
Fair value of liabilities as of the balance sheet date $ (1,923,000,000) $ (1,693,000,000)
Credit derivatives | Derivative liabilities, net | Discounted cash flow | Minimum
    
Quantitative Information About Level 3 Fair Value Measurements    
Year 1 loss estimates (as a percent) 0.00% 0.00%
Hedge cost (as a percent) 0.138% 0.463%
Bank profit (as a percent) 0.10% 0.10%
Internal floor (as a percent) 0.70% 0.70%
Credit derivatives | Derivative liabilities, net | Discounted cash flow | Maximum
    
Quantitative Information About Level 3 Fair Value Measurements    
Year 1 loss estimates (as a percent) 48.00% 48.00%
Hedge cost (as a percent) 3.05% 5.25%
Bank profit (as a percent) 14.355% 14.185%
Internal floor (as a percent) 1.00% 1.00%