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Investments (Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Security Type) (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) |
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value | 807.0 | 504.0
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (47.0) | (6.0)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 273.0 | 92.0
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (32.0) | (4.0)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 1,080.0 | 596.0
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (79.0) | (10.0)
Obligations Of U.S. States And Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value | 326.0 | 51.0
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (30.0) | (1.0)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 25.0 | 3.0
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (8.0) |
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 351.0 | 54.0
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (38.0) | (1.0)
Corporate Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value | 4,247.0 | 2,133.0
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (447.0) | (38.0)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 996.0 | 473.0
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (189.0) | (24.0)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 5,243.0 | 2,605.0
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (636.0) | (63.0)
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: Commercial [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value | 877.0 | 222.0
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (104.0) | (3.0)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 27.0 | 40.0
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (4.0) | (3.0)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 904.0 | 262.0
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (108.0) | (6.0)
Mortgage Backed Securities: Agency residential [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value | 2,086.0 | 1,101.0
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (222.0) | (12.0)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 588.0 | 280.0
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (115.0) | (7.0)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 2,674.0 | 1,381.0
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (337.0) | (19.0)
Mortgage Backed Securities: Non-agency residential [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value | 3.0 | 2.0
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation |  |
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 2.0 |
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation |  |
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 5.0 | 2.0
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total |  |
Foreign Government Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value | 971.0 | 392.0
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (137.0) | (10.0)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 250.0 | 101.0
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (68.0) | (18.0)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 1,221.0 | 493.0
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (205.0) | (28.0)
Foreign Corporate Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value | 2,792.0 | 1,735.0
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (496.0) | (46.0)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value | 808.0 | 211.0
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (229.0) | (18.0)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value | 3,600.0 | 1,945.0
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (726.0) | (65.0)
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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