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Investments (Composition Of Current And Past Due Mortgage Loans On Real Estate) (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
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Mortgage Loans On Real Estate Aging [Abstract] |  |
Allowance for credit losses | $ (96,000,000) | $ (204,000,000)
Unamortized premium (discount) | 16,000,000 | 8,000,000
Mark-to-market gains (losses) | (3,000,000) | (5,000,000)
Total carrying value | 17,991,000,000 | 16,763,000,000
Current [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Mortgage loans on real estate, gross | 18,004,000,000 | 16,855,000,000
30 to 59 Days Past Due [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Mortgage loans on real estate, gross | 36,000,000 | 32,000,000
60 to 89 Days Past Due [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Mortgage loans on real estate, gross | 5,000,000 | 8,000,000
90 Or More Days Past Due [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Mortgage loans on real estate, gross | 29,000,000 | 69,000,000
Commercial [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Mortgage loans on real estate, gross | 17,171,000,000 | 16,235,000,000
Allowance for credit losses | (79,000,000) | (187,000,000)
Unamortized premium (discount) | (11,000,000) | (14,000,000)
Mark-to-market gains (losses) | (3,000,000) | (5,000,000)
Total carrying value | 17,089,000,000 | 16,043,000,000
Commercial [Member] | Current [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Mortgage loans on real estate, gross | 17,167,000,000 | 16,245,000,000
Commercial [Member] | 30 to 59 Days Past Due [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Mortgage loans on real estate, gross | 15,000,000 | 4,000,000
Residential [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Mortgage loans on real estate, gross | 919,000,000 | 737,000,000
Allowance for credit losses | (17,000,000) | (17,000,000)
Unamortized premium (discount) | 27,000,000 | 22,000,000
Total carrying value | 902,000,000 | 720,000,000
Residential [Member] | Current [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Mortgage loans on real estate, gross | 837,000,000 | 610,000,000
Residential [Member] | 30 to 59 Days Past Due [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Mortgage loans on real estate, gross | 21,000,000 | 28,000,000
Residential [Member] | 60 to 89 Days Past Due [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Mortgage loans on real estate, gross | 5,000,000 | 8,000,000
Residential [Member] | 90 Or More Days Past Due [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Mortgage loans on real estate, gross | $ 29,000,000 | $ 69,000,000

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- Definition This item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of loans and long-term receivables (other than securities categorized as trading, available-for-sale or held-to-maturity) that have contractual principal amounts and for which the fair value option has been elected. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612 + Details
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