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Investments (Composition Of Current And Past Due Mortgage Loans On Real Estate) (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 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 | $ (81) | $ (77) | (96) | $ (170) | $ (184) | $ (204)
Unamortized premium (discount) | 21 |  | 16 |  |  |
Mark-to-market gains (losses) | (20) |  | (3) |  |  |
Total carrying value | 17,922 |  | 17,991 |  |  |
Current [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 17,648 |  | 18,004 |  |  |
30 to 59 Days Past Due [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 326 |  | 36 |  |  |
60 to 89 Days Past Due [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 3 |  | 5 |  |  |
90 Or More Days Past Due [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 25 |  | 29 |  |  |
Commercial [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 16,886 |  |  |  |  |
Allowance for credit losses | (72) | (59) | (79) | (156) | (172) | (187)
Unamortized premium (discount) | (10) |  | (11) |  |  |
Mark-to-market gains (losses) | (20) |  | (3) |  |  |
Total carrying value | 16,794 |  | 17,089 |  |  |
Commercial [Member] | Current [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 16,593 |  | 17,167 |  |  |
Commercial [Member] | 30 to 59 Days Past Due [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 303 |  | 15 |  |  |
Residential [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 1,137 |  | 919 |  |  |
Allowance for credit losses | (9) | $ (18) | (17) | $ (14) | $ (12) | $ (17)
Unamortized premium (discount) | 31 |  | 27 |  |  |
Total carrying value | 1,128 |  | 902 |  |  |
Residential [Member] | Current [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 1,055 |  | 837 |  |  |
Residential [Member] | 30 to 59 Days Past Due [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 23 |  | 21 |  |  |
Residential [Member] | 60 to 89 Days Past Due [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 3 |  | 5 |  |  |
Residential [Member] | 90 Or More Days Past Due [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | $ 25 |  | $ 29 |  |  |

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