Investments (Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Contractual Maturity) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	$ 14,960.0	$ 8,094.0
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(1,659.0)	(128.0)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	3,023.0	1,241.0
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(651.0)	(75.0)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	17,983.0	9,335.0
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(2,310.0)	(203.0)
No Recorded Allowance for Credit Losses [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	14,937.0
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(1,640.0)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	3,023.0
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(651.0)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	17,960.0
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(2,291.0)
Due In One Year Or Less [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	895.0	130.0
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(21.0)	(2.0)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	59.0	137.0
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(6.0)	(12.0)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	954.0	267.0
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(27.0)	(14.0)
Due In One Year Through Five Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	4,908.0	2,165.0
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(502.0)	(35.0)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	1,264.0	446.0
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(204.0)	(29.0)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	6,173.0	2,612.0
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(706.0)	(64.0)
Due in Five Years Through Ten Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	2,517.0	1,728.0
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(459.0)	(47.0)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	812.0	244.0
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(239.0)	(22.0)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	3,329.0	1,972.0
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(697.0)	(69.0)
Due After Ten Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	823.0	792.0
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(174.0)	(16.0)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	217.0	51.0
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(77.0)	(3.0)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	1,040.0	843.0
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(252.0)	(19.0)
Asset Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	2,827.0	1,954.0
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(158.0)	(11.0)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	55.0	42.0
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(5.0)	(1.0)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	2,882.0	1,996.0
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(164.0)	(12.0)
Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	2,967.0	1,325.0
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(325.0)	(15.0)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	616.0	320.0
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(120.0)	(10.0)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	3,583.0	1,646.0
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(445.0)	(25.0)
Recorded an Allowance for Credit Losses [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	23.0
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(19.0)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	23.0	16.0
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	$ (19.0)	$ (0.4)

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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