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Investments (Composition Of Current And Past Due Mortgage Loans On Real Estate) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |
Mortgage loans on real estate, gross |  | $ 16,235 |  |
Allowance for credit losses | $ (184) | (204) | $ (161) | $ (2)
Unamortized premium (discount) | 10 | 8 |  |
Mark-to-market gains (losses) | (6) | (5) |  |
Total carrying value | 17,255 | 16,763 |  |
Current [Member] |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |
Mortgage loans on real estate, gross | 17,340 | 16,855 |  |
30 to 59 Days Past Due [Member] |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |
Mortgage loans on real estate, gross | 32 | 32 |  |
60 to 89 Days Past Due [Member] |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |
Mortgage loans on real estate, gross | 8 | 8 |  |
90 Or More Days Past Due [Member] |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |
Mortgage loans on real estate, gross | 55 | 69 |  |
Commercial [Member] |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |
Mortgage loans on real estate, gross | 16,667 |  |  |
Allowance for credit losses | (172) | (187) | (126) |
Unamortized premium (discount) | (13) | (14) |  |
Mark-to-market gains (losses) | (6) | (5) |  |
Total carrying value | 16,489 | 16,043 |  |
Commercial [Member] | Current [Member] |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |
Mortgage loans on real estate, gross | 16,674 | 16,245 |  |
Commercial [Member] | 30 to 59 Days Past Due [Member] |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |
Mortgage loans on real estate, gross | 6 | 4 |  |
Residential [Member] |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |
Mortgage loans on real estate, gross | 778 | 737 |  |
Allowance for credit losses | (12) | (17) | $ (35) | $ (2)
Unamortized premium (discount) | 23 | 22 |  |
Total carrying value | 766 | 720 |  |
Residential [Member] | Current [Member] |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |
Mortgage loans on real estate, gross | 666 | 610 |  |
Residential [Member] | 30 to 59 Days Past Due [Member] |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |
Mortgage loans on real estate, gross | 26 | 28 |  |
Residential [Member] | 60 to 89 Days Past Due [Member] |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |
Mortgage loans on real estate, gross | 8 | 8 |  |
Residential [Member] | 90 Or More Days Past Due [Member] |  |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |  |
Mortgage loans on real estate, gross | $ 55 | $ 69 |  |

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