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Investments (Composition Of Current And Past Due Mortgage Loans On Real Estate) (Details) - USD ($) | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Mortgage Loans On Real Estate Aging [Abstract] |  |
Allowance for credit losses | $ (99,000,000) | $ (96,000,000)
Unamortized premium (discount) | 28,000,000 | 16,000,000
Mark-to-market gains (losses) | (27,000,000) | (3,000,000)
Total carrying value | 18,301,000,000 | 17,991,000,000
Current [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Mortgage loans on real estate, gross | 18,318,000,000 | 18,004,000,000
30 to 59 Days Past Due [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Mortgage loans on real estate, gross | 42,000,000 | 36,000,000
60 to 89 Days Past Due [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Mortgage loans on real estate, gross | 6,000,000 | 5,000,000
90 Or More Days Past Due [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Mortgage loans on real estate, gross | 33,000,000 | 29,000,000
Commercial [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Mortgage loans on real estate, gross | 17,014,000,000 | 17,171,000,000
Allowance for credit losses | (84,000,000) | (79,000,000)
Unamortized premium (discount) | (8,000,000) | (11,000,000)
Mark-to-market gains (losses) | (27,000,000) | (3,000,000)
Total carrying value | 16,903,000,000 | 17,089,000,000
Commercial [Member] | Current [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Mortgage loans on real estate, gross | 17,003,000,000 | 17,167,000,000
Commercial [Member] | 30 to 59 Days Past Due [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Mortgage loans on real estate, gross | 19,000,000 | 15,000,000
Residential [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Mortgage loans on real estate, gross | 1,413,000,000 | 919,000,000
Allowance for credit losses | (15,000,000) | (17,000,000)
Unamortized premium (discount) | 36,000,000 | 27,000,000
Total carrying value | 1,398,000,000 | 902,000,000
Residential [Member] | Current [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Mortgage loans on real estate, gross | 1,315,000,000 | 837,000,000
Residential [Member] | 30 to 59 Days Past Due [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Mortgage loans on real estate, gross | 23,000,000 | 21,000,000
Residential [Member] | 60 to 89 Days Past Due [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Mortgage loans on real estate, gross | 6,000,000 | 5,000,000
Residential [Member] | 90 Or More Days Past Due [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Mortgage loans on real estate, gross | $ 33,000,000 | $ 29,000,000

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