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Loss And Loss Adjustment Expense Reserves (Schedule Of Loss And Loss Adjustment Expenses Reserves) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Loss And Loss Adjustment Expense Reserves [Line Items]      
Changes in unearned premium revenue $ 165 $ 206 $ 263
Loss And Lae Reserves [Member]      
Loss And Loss Adjustment Expense Reserves [Line Items]      
Gross loss and LAE reserve, beginning balance 979 541  
Loss payments for cases (354) (1,069) [1]  
Accretion of claim liability discount 26 12  
Changes in discount rates 13 15  
Changes in assumptions 261 661  
Changes in unearned premium revenue 15 (30)  
Changes in LAE (6) 6  
Other [2] 0 843 [3]  
Gross loss and LAE reserve, ending balance $ 934 $ 979 $ 541
[1]
Includes payments made to satisfy the Zohar II Claim.
[2]
Primarily changes in amount and timing of collections.
[3]
Primarily changes in the amount to satisfy the Zohar II Claim.