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Loss And Loss Adjustment Expense Reserves (Schedule Of Losses And Loss Adjustment Expenses) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Loss And Loss Adjustment Expense Reserves [Line Items]  
Losses and LAE related to actual and expected payments $ 147
Recoveries of actual and expected payments (50)
Gross losses incurred 97
Reinsurance 0
Losses and LAE 97
Second-Lien RMBS Reserves [Member]
  
Loss And Loss Adjustment Expense Reserves [Line Items]  
Losses and LAE related to actual and expected payments 129
Recoveries of actual and expected payments (48)
Gross losses incurred 81
Reinsurance 0
Losses and LAE 81
Other [Member]
  
Loss And Loss Adjustment Expense Reserves [Line Items]  
Losses and LAE related to actual and expected payments 18
Recoveries of actual and expected payments (2)
Gross losses incurred 16
Reinsurance 0
Losses and LAE $ 16