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Investments (Composition Of Current And Past Due Mortgage Loans On Real Estate) (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
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Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross |  |  | $ 17,171 |  |  |
Allowance for credit losses | $ (91) | $ (81) | (96) | $ (131) | $ (170) | $ (204)
Unamortized premium (discount) | 25 |  | 16 |  |  |
Mark-to-market gains (losses) | (21) |  | (3) |  |  |
Total carrying value | 18,066 |  | 17,991 |  |  |
Current [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 18,108 |  | 18,004 |  |  |
30 to 59 Days Past Due [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 12 |  | 36 |  |  |
60 to 89 Days Past Due [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 5 |  | 5 |  |  |
90 Or More Days Past Due [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 28 |  | 29 |  |  |
Commercial [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 16,885 |  |  |  |  |
Allowance for credit losses | (80) | (72) | (79) | (115) | (156) | (187)
Unamortized premium (discount) | (9) |  | (11) |  |  |
Mark-to-market gains (losses) | (21) |  | (3) |  |  |
Total carrying value | 16,784 |  | 17,089 |  |  |
Commercial [Member] | Current [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 16,894 |  | 17,167 |  |  |
Commercial [Member] | 30 to 59 Days Past Due [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross |  |  | 15 |  |  |
Residential [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 1,293 |  | 919 |  |  |
Allowance for credit losses | (11) | $ (9) | (17) | $ (16) | $ (14) | $ (17)
Unamortized premium (discount) | 34 |  | 27 |  |  |
Total carrying value | 1,282 |  | 902 |  |  |
Residential [Member] | Current [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 1,214 |  | 837 |  |  |
Residential [Member] | 30 to 59 Days Past Due [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 12 |  | 21 |  |  |
Residential [Member] | 60 to 89 Days Past Due [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 5 |  | 5 |  |  |
Residential [Member] | 90 Or More Days Past Due [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | $ 28 |  | $ 29 |  |  |

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