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Investments (Summary Of Changes In Net Unrealized Appreciation (Depreciation) For The Company's Investments) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	$ (724)	$ (109)	$ (2,484)	$ (344)
Deferred tax benefit (expense)	53	7	285	36
Total URA(D) on securities arising during the period	(671)	(101)	(2,199)	(308)
Fixed Maturity Securities and Short-Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	$ (724)	$ (109)	$ (2,484)	$ (344)

X

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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