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Loss And Loss Adjustment Expense Reserves (Schedule Of Insurance Loss Recoverable) (Detail) - Insurance Loss Recoverable [Member]
$ in Millions
 3 Months Ended
Mar. 31, 2021
USD ($)
Roll forward of Insurance Loss Recoverable [Line Items]  
Gross Reserve beginning balance, Insurance loss recoverable $ 1,677
Collections for Cases (14)
Accretion of Recoveries 3
Changes in Discount Rates (98)
Changes in Assumptions 53 [1]
Other 1 [2]
Gross Reserve ending balance, Insurance loss recoverable $ 1,622
[1] Includes amounts related to paid claims and LAE.
[2] Primarily changes in amount and timing of collections.