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Loss And Loss Adjustment Expense Reserves (Schedule Of Insurance Loss Recoverable And Changes In Recoveries On Unpaid Losses) (Detail)
$ in Millions
 6 Months Ended
Jun. 30, 2016
USD ($)
Loss And Loss Adjustment Expense Recoveries [Line Items]  
Gross Reserve beginning balance, Insurance loss recoverable $ 577
Gross Reserve ending balance, Insurance loss recoverable 365
Insurance Loss Recoverable [Member]  
Loss And Loss Adjustment Expense Recoveries [Line Items]  
Gross Reserve beginning balance, Insurance loss recoverable 577
Collections for Cases with Recoveries (50)
Accretion of Recoveries 3
Changes in Discount Rates 10
Changes in Assumptions (126)
Changes in LAE Recoveries (4)
Other (45) [1]
Gross Reserve ending balance, Insurance loss recoverable 365
Recoveries On Unpaid Losses [Member]  
Loss And Loss Adjustment Expense Recoveries [Line Items]  
Gross Reserve beginning balance,Recoveries on unpaid losses 100
Collections for Cases with Recoveries 0
Accretion of Recoveries 1
Changes in Discount Rates 9
Changes in Assumptions (24)
Changes in LAE Recoveries 5
Other 0 [1]
Gross Reserve ending balance, Recoveries on unpaid losses 91
Insurance Loss Recoverable And Changes In Recoveries On Unpaid Losses [Member]  
Loss And Loss Adjustment Expense Recoveries [Line Items]  
Gross Reserve beginning balance, Total 677
Collections for Cases with Recoveries (50)
Accretion of Recoveries 4
Changes in Discount Rates 19
Changes in Assumptions (150)
Changes in LAE Recoveries 1
Other (45) [1]
Gross Reserve ending balance, Total $ 456
[1] Primarily changes in amount and timing of collections.