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Loss And Loss Adjustment Expense Reserves (Schedule Of Losses And Loss Adjustment Expenses) (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Loss And Loss Adjustment Expense Reserves [Line Items]        
Policyholder Benefits And Claims Incurred Net $ 77 $ 46 $ 99 $ 40
U S Public Finance Insurance [Member]        
Loss And Loss Adjustment Expense Reserves [Line Items]        
Policyholder Benefits And Claims Incurred Net 9 8 18 2
Second-Lien RMBS [Member]        
Loss And Loss Adjustment Expense Reserves [Line Items]        
Policyholder Benefits And Claims Incurred Net 21 36 34 29
First-Lien RMBS [Member]        
Loss And Loss Adjustment Expense Reserves [Line Items]        
Policyholder Benefits And Claims Incurred Net 35 (26) 61 (16)
Other [Member]        
Loss And Loss Adjustment Expense Reserves [Line Items]        
Policyholder Benefits And Claims Incurred Net $ 12 $ 28 $ (14) $ 25