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Loss And Loss Adjustment Expense Reserves (Schedule Of Loss And Loss Adjustment Expenses Reserves) (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Loss And Loss Adjustment Expense Reserves [Line Items]    
Changes in unearned premium revenue $ 19 $ 19
Loss And Lae Reserves [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Gross loss and LAE reserve, beginning balance [1],[2] 990  
Loss payments for cases (55)  
Accretion of claim liability discount 3  
Changes in discount rates (11)  
Changes in assumptions 57  
Changes in unearned premium revenue 0  
Other 6  
Gross loss and LAE reserve, ending balance [1],[2] $ 990  
[1] Amounts are net of expected recoveries.
[2] Includes changes in amount and timing of estimated payments and recoveries.