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Investments (Summary Of Amortized Cost, Allowance For Credit Losses, Gross Unrealized Appreciation/(Depreciation) And Fair Value Of Fixed Maturity Securities) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Fixed maturity securities - available for sale: |  |
Amortized Cost | $ 24,191 | $ 22,064
Allowance for Credit Losses | (54) | (30)
Fair Value | 22,236 | 22,308
Fixed maturity securities - held to maturity: |  |
Allowance for credit losses | (9) |
Fair Value | 821 |
Fixed Maturity Securities [Member] |  |
Fixed maturity securities - available for sale: |  |
Amortized Cost | 24,191 | 22,064
Allowance for Credit Losses | (54) | (30)
Unrealized Appreciation | 81 | 478
Unrealized Depreciation | (1,982) | (203)
Fair Value | 22,236 | 22,308
Fixed maturity securities - held to maturity: |  |
Amortized Cost | 848 |
Allowance for credit losses | (9) |
Unrealized Appreciation | 3 |
Unrealized Depreciation | (22) |
Fair Value | 821 |
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member] |  |
Fixed maturity securities - available for sale: |  |
Amortized Cost | 1,334 | 1,407
Allowance for Credit Losses |  |
Unrealized Appreciation | 6 | 24
Unrealized Depreciation | (82) | (10)
Fair Value | 1,257 | 1,421
Obligations Of U.S. States And Political Subdivisions [Member] |  |
Fixed maturity securities - available for sale: |  |
Amortized Cost | 444 | 559
Allowance for Credit Losses |  |
Unrealized Appreciation | 2 | 29
Unrealized Depreciation | (32) | (1)
Fair Value | 413 | 587
Corporate Securities [Member] |  |
Fixed maturity securities - available for sale: |  |
Amortized Cost | 7,044 | 7,444
Allowance for Credit Losses | (45) | (19)
Unrealized Appreciation | 31 | 195
Unrealized Depreciation | (561) | (63)
Fair Value | 6,469 | 7,557
Fixed maturity securities - held to maturity: |  |
Amortized Cost | 152 |
Allowance for credit losses | (2) |
Unrealized Appreciation |  |
Unrealized Depreciation | (6) |
Fair Value | 144 |
Asset-Backed Securities [Member] |  |
Fixed maturity securities - available for sale: |  |
Amortized Cost | 4,229 | 3,579
Allowance for Credit Losses |  | (8)
Unrealized Appreciation | 5 | 22
Unrealized Depreciation | (171) | (12)
Fair Value | 4,063 | 3,582
Fixed maturity securities - held to maturity: |  |
Amortized Cost | 661 |
Allowance for credit losses | (6) |
Unrealized Appreciation | 2 |
Unrealized Depreciation | (15) |
Fair Value | 642 |
Mortgage-Backed Securities: Commercial [Member] |  |
Fixed maturity securities - available for sale: |  |
Amortized Cost | 1,023 | 1,032
Allowance for Credit Losses |  |
Unrealized Appreciation |  | 38
Unrealized Depreciation | (105) | (6)
Fair Value | 919 | 1,064
Fixed maturity securities - held to maturity: |  |
Amortized Cost | 7 |
Allowance for credit losses |  |
Unrealized Appreciation |  |
Unrealized Depreciation |  |
Fair Value | 7 |
Mortgage Backed Securities: Agency residential [Member] |  |
Fixed maturity securities - available for sale: |  |
Amortized Cost | 3,382 | 2,361
Allowance for Credit Losses |  |
Unrealized Appreciation | 7 | 33
Unrealized Depreciation | (290) | (19)
Fair Value | 3,099 | 2,375
Mortgage Backed Securities: Non-agency residential [Member] |  |
Fixed maturity securities - available for sale: |  |
Amortized Cost | 5 | 7
Allowance for Credit Losses |  |
Unrealized Appreciation |  |
Unrealized Depreciation | (1) |
Fair Value | 4 | 7
Foreign Government Securities [Member] |  |
Fixed maturity securities - available for sale: |  |
Amortized Cost | 1,586 | 1,424
Allowance for Credit Losses |  |
Unrealized Appreciation | 8 | 42
Unrealized Depreciation | (179) | (28)
Fair Value | 1,415 | 1,438
Foreign Corporate Securities [Member] |  |
Fixed maturity securities - available for sale: |  |
Amortized Cost | 5,143 | 4,251
Allowance for Credit Losses | (10) | (3)
Unrealized Appreciation | 23 | 95
Unrealized Depreciation | (562) | (65)
Fair Value | 4,596 | $ 4,279
Fixed maturity securities - held to maturity: |  |
Amortized Cost | 28 |
Allowance for credit losses | (1) |
Unrealized Appreciation | 2 |
Unrealized Depreciation |  |
Fair Value | $ 28 |

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