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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, 2014
Loss And Loss Adjustment Expense Recoveries [Line Items]  
Gross Reserve beginning balance, Total $ 900
Collections for Cases with Recoveries (84)
Accretion of Recoveries 13
Changes in Discount Rates 22
Changes in Assumptions (191)
Changes in LAE Recoveries 9
Other 1 [1]
Gross Reserve ending balance, Total 670
Insurance Loss Recoverable [Member]
  
Loss And Loss Adjustment Expense Recoveries [Line Items]  
Gross Reserve beginning balance, Insurance loss recoverable 694
Collections for Cases with Recoveries (84)
Accretion of Recoveries 10
Changes in Discount Rates 10
Changes in Assumptions (63)
Changes in LAE Recoveries 7
Other 1 [1]
Gross Reserve ending balance, Insurance loss recoverable 575
Recoveries On Unpaid Losses [Member]
  
Loss And Loss Adjustment Expense Recoveries [Line Items]  
Gross Reserve beginning balance,Recoveries on unpaid losses 206
Collections for Cases with Recoveries 0
Accretion of Recoveries 3
Changes in Discount Rates 12
Changes in Assumptions (128)
Changes in LAE Recoveries 2
Other 0 [1]
Gross Reserve ending balance, Recoveries on unpaid losses $ 95
[1]
Primarily changes in amount and timing of collections.