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Loss And Loss Adjustment Expense Reserves (Schedule Of Loss And Loss Adjustment Expenses Reserves) (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Loss And Loss Adjustment Expense Reserves [Line Items]    
Changes in unearned premium revenue $ 38 $ 67
Loss And Lae Reserves [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Gross loss and LAE reserve, beginning balance [1],[2] 901  
Loss payments for cases (97)  
Accretion of claim liability discount 6  
Changes in discount rates (87)  
Changes in assumptions 291  
Changes in unearned premium revenue 7  
Other (3)  
Gross loss and LAE reserve, ending balance [1],[2] $ 1,018  
[1] Amounts are net of expected recoveries of unpaid claims.
[2] Amounts are net of expected recoveries.