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Loss And Loss Adjustment Expense Reserves (Schedule Of Insurance Loss Recoverable And Changes In Recoveries On Unpaid Losses) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Non Variable Interest Entities [Member]
Dec. 31, 2011
Non Variable Interest Entities [Member]
Mar. 31, 2012
Insurance Loss Recoverable And Changes In Recoveries On Unpaid Losses [Member]
Mar. 31, 2012
Insurance Loss Recoverable And Changes In Recoveries On Unpaid Losses [Member]
Insurance Loss Recoverable [Member]
Mar. 31, 2012
Insurance Loss Recoverable And Changes In Recoveries On Unpaid Losses [Member]
Recoveries On Unpaid Losses [Member]
Loss And Loss Adjustment Expense Reserves [Line Items]          
Gross Reserve as of December 31, 2011, Insurance loss recoverable $ 3,137 $ 3,046   $ 3,046  
Gross Reserve as of December 31, 2011, Recoveries on unpaid losses         562
Gross Reserve as of December 31, 2011, Total     3,608    
Collections for Cases with Recoveries     (2) (2)  
Accretion of Recoveries     11 9 2
Changes in Discount Rates     (27) (12) (15)
Changes in Timing of Collections             
Changes in Amount of Collections     (63) (63)  
Changes in Assumptions     122 152 (30)
Changes in LAE Recoveries     6 7 (1)
Gross Reserve as of March 31, 2012, Insurance loss recoverable 3,137 3,046   3,137  
Gross Reserve as of March 31, 2012, Recoveries on unpaid losses         518
Gross Reserve as of March 31, 2012, Total     $ 3,655