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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
 3 Months Ended
Mar. 31, 2017
USD ($)
Loss And Loss Adjustment Expense Recoveries [Line Items]  
Gross Reserve beginning balance, Insurance loss recoverable $ 504
Gross Reserve beginning balance, Total 583
Collections for Cases with Recoveries (42)
Accretion of Recoveries 2
Changes in Discount Rates 4
Changes in Assumptions (29)
Changes in LAE Recoveries (4)
Other 23 [1]
Gross Reserve ending balance, Insurance loss recoverable 486
Gross Reserve ending balance, Total 537
Insurance Loss Recoverable [Member]  
Loss And Loss Adjustment Expense Recoveries [Line Items]  
Gross Reserve beginning balance, Insurance loss recoverable 504
Collections for Cases with Recoveries (42)
Accretion of Recoveries 2
Changes in Discount Rates 3
Changes in Assumptions (4)
Changes in LAE Recoveries 0
Other 23 [2]
Gross Reserve ending balance, Insurance loss recoverable 486
Recoveries On Unpaid Losses [Member]  
Loss And Loss Adjustment Expense Recoveries [Line Items]  
Gross Reserve beginning balance,Recoveries on unpaid losses 79 [2]
Collections for Cases with Recoveries 0
Accretion of Recoveries 0
Changes in Discount Rates 1 [2]
Changes in Assumptions (25) [2]
Changes in LAE Recoveries (4) [2]
Other 0
Gross Reserve ending balance, Recoveries on unpaid losses $ 51 [2]
[1]
Primarily changes in amount and timing of collections.
[2]
As of March 31, 2017 and December 31, 2016, excludes Puerto Rico recoveries, and as of December 31, 2016, the Zohar II recoveries, which have been netted against reserves.