Loss And Loss Adjustment Expense Reserves (Schedule Of Insurance Loss Recoverable) (Detail) - Insurance Loss Recoverable [Member] $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($)
Roll forward of Insurance Loss Recoverable [Line Items]
Gross Reserve beginning balance, Insurance loss recoverable	$ 1,677
Collections for Cases	(44)
Accretion of Recoveries	8
Changes in Discount Rates	(63)
Changes in Assumptions	(18)	[1]
Other	1	[2]
Gross Reserve ending balance, Insurance loss recoverable	$ 1,561

[1] Includes amounts related to paid claims.

[2] Primarily changes in amount and timing of collections and LAE.