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Investments (Composition Of Current And Past Due Mortgage Loans On Real Estate) (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Mortgage Loans On Real Estate Aging [Abstract] |  |
Current | $ 16,875 | $ 16,279
Allowance for credit losses | (161) | (2)
Unamortized premium (discount) | 8 | 6
Mark-to-market gains (losses) | 26 |
Total carrying value | 16,791 | 16,339
30 to 59 Days Past Due [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Past due | 16 | 30
60 to 89 Days Past Due [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Past due | 4 | 10
90 Or More Days Past Due [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Past due | 23 | 16
Commercial [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Current | 16,168 | 15,620
Allowance for credit losses | (126) |
Unamortized premium (discount) | (16) | (17)
Mark-to-market gains (losses) | 26 |
Total carrying value | 16,052 | 15,606
Commercial [Member] | 30 to 59 Days Past Due [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Past due |  | 3
Residential [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Current | 707 | 659
Allowance for credit losses | (35) | (2)
Unamortized premium (discount) | 24 | 23
Total carrying value | 739 | 733
Residential [Member] | 30 to 59 Days Past Due [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Past due | 16 | 27
Residential [Member] | 60 to 89 Days Past Due [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Past due | 4 | 10
Residential [Member] | 90 Or More Days Past Due [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Past due | $ 23 | $ 16

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- Definition The amount of premium (net of discount) that was originally recognized at the issuance of the mortgage loan that has yet to be amortized. + References No definition available. + Details
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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=75031198&loc=d3e14064-108612 + Details
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