Loss And Loss Adjustment Expense Reserves (Schedule Of Insurance Loss Recoverable) (Detail) - Insurance Loss Recoverable [Member] $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Roll forward of Insurance Loss Recoverable [Line Items]
Gross Reserve beginning balance, Insurance loss recoverable	$ 1,595
Collections for Cases	(110)
Accretion of Recoveries	27
Changes in Discount Rates	87
Changes in Assumptions	216	[1]
Other	28	[2]
Gross Reserve ending balance, Insurance loss recoverable	$ 1,843

[1] Includes amounts related to paid claims and LAE that are expected to be recovered in the future.

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