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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
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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)

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