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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, 2018
USD ($)
Loss And Loss Adjustment Expense Recoveries [Line Items]  
Gross Reserve beginning balance, Insurance loss recoverable $ 511
Gross Reserve beginning balance, Total 546
Collections for Cases with Recoveries (14)
Accretion of Recoveries 3
Changes in Discount Rates (16)
Changes in Assumptions 44
Changes in LAE Recoveries 1
Other 1 [1]
Gross Reserve ending balance, Insurance loss recoverable 530
Gross Reserve ending balance, Total 565
Insurance Loss Recoverable [Member]  
Loss And Loss Adjustment Expense Recoveries [Line Items]  
Gross Reserve beginning balance, Insurance loss recoverable 511
Collections for Cases with Recoveries (14)
Accretion of Recoveries 3
Changes in Discount Rates (15)
Changes in Assumptions 44 [2]
Changes in LAE Recoveries 0
Other 1 [1]
Gross Reserve ending balance, Insurance loss recoverable 530
Recoveries On Unpaid Losses [Member]  
Loss And Loss Adjustment Expense Recoveries [Line Items]  
Gross Reserve beginning balance,Recoveries on unpaid losses 35 [3]
Collections for Cases with Recoveries 0
Accretion of Recoveries 0
Changes in Discount Rates (1) [3]
Changes in Assumptions 0 [3]
Changes in LAE Recoveries 1 [3]
Other 0
Gross Reserve ending balance, Recoveries on unpaid losses $ 35 [3]
[1]
Primarily changes in amount and timing of collections.
[2]
Includes amounts which have been paid and are expected to be recovered in the future.
[3]
As of March 31, 2018 and December 31, 2017, excludes Puerto Rico recoveries, which have been netted against reserves.