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Investments (Composition Of Current And Past Due Mortgage Loans On Real Estate) (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
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Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross |  |  | $ 16,235 |  |  |
Allowance for credit losses | $ (131) | $ (170) | (204) | $ (202) | $ (273) | $ (2)
Unamortized premium (discount) | 11 |  | 8 |  |  |
Mark-to-market gains (losses) | (3) |  | (5) |  |  |
Total carrying value | 17,730 |  | 16,763 |  |  |
Current [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 17,802 |  | 16,855 |  |  |
30 to 59 Days Past Due [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 15 |  | 32 |  |  |
60 to 89 Days Past Due [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 3 |  | 8 |  |  |
90 Or More Days Past Due [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 33 |  | 69 |  |  |
Commercial [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 17,099 |  |  |  |  |
Allowance for credit losses | (115) | (156) | (187) | (172) | (236) |
Unamortized premium (discount) | (12) |  | (14) |  |  |
Mark-to-market gains (losses) | (3) |  | (5) |  |  |
Total carrying value | 16,981 |  | 16,043 |  |  |
Commercial [Member] | Current [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 17,111 |  | 16,245 |  |  |
Commercial [Member] | 30 to 59 Days Past Due [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross |  |  | 4 |  |  |
Residential [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 765 |  | 737 |  |  |
Allowance for credit losses | (16) | $ (14) | (17) | $ (30) | $ (37) | $ (2)
Unamortized premium (discount) | 23 |  | 22 |  |  |
Total carrying value | 749 |  | 720 |  |  |
Residential [Member] | Current [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 691 |  | 610 |  |  |
Residential [Member] | 30 to 59 Days Past Due [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 15 |  | 28 |  |  |
Residential [Member] | 60 to 89 Days Past Due [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | 3 |  | 8 |  |  |
Residential [Member] | 90 Or More Days Past Due [Member] |  |  |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |  |  |
Mortgage loans on real estate, gross | $ 33 |  | $ 69 |  |  |

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