Investments (Summary Of Components Of Net Realized Capital Gains (Losses)) (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]
Allowance for credit losses	$ (12)	$ (7)	$ (12)	$ (30)
Gains (losses) from fair value adjustments	(245)	(48)	(801)	274
Total net gains (losses) on investments	(237)	(51)	(842)	267
Beginning Balance	(28)	(24)	(27)	(2)
Credit losses on securities where credit losses were not previously recorded	(9)	(5)	(17)	(26)
Increases in allowance on previously impaired securities	(3)	(4)	(4)	(5)
Decrease in allowance on previously impaired securities
Reduction in allowance due to disposals		1	9	2
Ending Balance	(39)	(31)	(39)	(31)
Fixed Maturity Securities [Member] | Market Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Allowance for credit losses	(12)	(7)	(12)	(30)
Net realized gains (losses) from dispositions	(45)	3	(60)	11
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance	(26)	(18)	(19)	(1)
Credit losses on securities where credit losses were not previously recorded	(2)	(5)	(9)	(21)
Increases in allowance on previously impaired securities	(3)	(1)	(4)	(2)
Decrease in allowance on previously impaired securities
Reduction in allowance due to disposals		1	1	2
Ending Balance	(31)	(23)	(31)	(23)
Asset Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance		(5)	(8)
Credit losses on securities where credit losses were not previously recorded	(6)		(6)	(5)
Increases in allowance on previously impaired securities		(3)		(3)
Decrease in allowance on previously impaired securities
Reduction in allowance due to disposals			8
Ending Balance	(6)	(8)	(6)	(8)
Equity Securities [Member] | Market Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Net realized gains (losses) from dispositions	57		19	6
Gains (losses) from fair value adjustments	(134)	(4)	(451)	137
Other invested assets	6	2	10	6
Other Invested Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from fair value adjustments	(111)	(44)	(350)	137
Short-Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Net realized gains (losses) from dispositions	1		1
Foreign Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance	(2)
Credit losses on securities where credit losses were not previously recorded	(1)		(2)
Increases in allowance on previously impaired securities
Decrease in allowance on previously impaired securities
Reduction in allowance due to disposals			1
Ending Balance	$ (2)		$ (2)