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Investments (Composition Of Current And Past Due Mortgage Loans On Real Estate) (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Allowance for credit losses | $ (105) | $ (103) | $ (99) | $ (81) | $ (77) | $ (96)
Unamortized premium (discount) | 32 |  | 28 |  |  |
Mark-to-market gains (losses) | (28) |  | (27) |  |  |
Total carrying value | 18,460 |  | 18,301 |  |  |
Current [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 18,492 |  | 18,318 |  |  |
30 to 59 Days Past Due [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 20 |  | 42 |  |  |
60 to 89 Days Past Due [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 4 |  | 6 |  |  |
90 Or More Days Past Due [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 45 |  | 33 |  |  |
Commercial [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 17,014 |  | 17,014 |  |  |
Allowance for credit losses | (82) | (83) | (84) | (72) | (59) | (79)
Unamortized premium (discount) | (7) |  | (8) |  |  |
Mark-to-market gains (losses) | (27) |  | (27) |  |  |
Total carrying value | 16,905 |  | 16,903 |  |  |
Commercial [Member] | Current [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 17,021 |  | 17,003 |  |  |
Commercial [Member] | 30 to 59 Days Past Due [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross |  |  | 19 |  |  |
Residential [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 1,579 |  | 1,413 |  |  |
Allowance for credit losses | (23) | $ (20) | (15) | $ (9) | $ (18) | $ (17)
Unamortized premium (discount) | 39 |  | 36 |  |  |
Mark-to-market gains (losses) | (1) |  |  |  |  |
Total carrying value | 1,555 |  | 1,398 |  |  |
Residential [Member] | Current [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 1,471 |  | 1,315 |  |  |
Residential [Member] | 30 to 59 Days Past Due [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 20 |  | 23 |  |  |
Residential [Member] | 60 to 89 Days Past Due [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 4 |  | 6 |  |  |
Residential [Member] | 90 Or More Days Past Due [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | $ 45 |  | $ 33 |  |  |

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