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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 | Dec. 31, 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, Fair Value | $ 15,215 | $ 8,094
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (1,217) | (128)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Fair Value | 4,432 | 1,241
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (764) | (75)
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value | 19,647 | 9,335
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (1,982) | (203)
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, Fair Value | 15,213 |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (1,217) |
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Fair Value | 4,432 |
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (764) |
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value | 19,645 |
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (1,982) |
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, Fair Value | 668 | 504
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (31) | (6)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Fair Value | 487 | 92
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (52) | (4)
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value | 1,155 | 596
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (82) | (10)
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, Fair Value | 235 | 51
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (23) | (1)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Fair Value | 27 | 3
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (9) |
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value | 261 | 54
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (32) | (1)
Corporate Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Fair Value | 4,143 | 2,133
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (326) | (38)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Fair Value | 1,316 | 473
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (234) | (24)
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value | 5,459 | 2,605
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (561) | (63)
Asset-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Fair Value | 3,204 | 1,954
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (142) | (11)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Fair Value | 456 | 42
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (29) | (1)
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value | 3,661 | 1,996
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (171) | (12)
Mortgage-Backed Securities: Commercial [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Fair Value | 806 | 222
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (90) | (3)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Fair Value | 101 | 40
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (15) | (3)
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value | 907 | 262
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (105) | (6)
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, Fair Value | 1,905 | 1,101
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (132) | (12)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Fair Value | 870 | 280
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (158) | (7)
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value | 2,776 | 1,381
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (289) | (19)
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, Fair Value | 4 | 2
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, Fair Value | 1 |
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (1) |
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value | 4 | 2
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, Fair Value | 985 | 392
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (100) | (10)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Fair Value | 321 | 101
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (79) | (18)
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value | 1,306 | 493
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (179) | (28)
Foreign Corporate Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Fair Value | 3,264 | 1,735
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation | (372) | (46)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Fair Value | 853 | 211
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation | (189) | (18)
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value | 4,117 | 1,945
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total | (561) | $ (65)
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, Fair Value | 2 |
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, Fair Value |  |
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation |  |
Fixed maturity securities, Duration of Unrealized Loss, Total, Fair Value | 2 |
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total |  |

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