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Loss And Loss Adjustment Expense Reserves (Schedule Of Insurance Loss Recoverable And Changes In Recoveries On Unpaid Losses) (Detail) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2012
Insurance Loss Recoverable And Changes In Recoveries On Unpaid Losses [Member]
Sep. 30, 2012
Insurance Loss Recoverable And Changes In Recoveries On Unpaid Losses [Member]
Insurance Claim Loss Recoverable [Member]
Sep. 30, 2012
Insurance Loss Recoverable And Changes In Recoveries On Unpaid Losses [Member]
Recorded Recoveries [Member]
Loss And Loss Adjustment Expense Reserves [Line Items]          
Collections for Cases with Recoveries     $ (6) $ (6)  
Accretion of Recoveries     36 30 6
Changes in Discount Rates     27 8 19
Changes in Timing of Collections             
Changes in Amount of Collections     (149) (149)  
Changes in Assumptions     181 366 (185)
Changes in LAE Recoveries     14 21 (7)
Gross Reserve beginning balance, Insurance loss recoverable 3,316 3,046      
Gross Reserve beginning balance, Recoveries on unpaid losses 395 562      
Gross Reserve beginning balance, Total 3,711 3,608      
Gross Reserve ending balance, Insurance loss recoverable 3,316 3,046      
Gross Reserve ending balance, Recoveries on unpaid losses 395 562      
Gross Reserve ending balance, Total $ 3,711 $ 3,608