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Investments (Composition Of Current And Past Due Mortgage Loans On Real Estate) (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Mortgage Loans On Real Estate Aging [Abstract] |  |  |
Current | $ 16,646 |  | $ 16,279
Allowance for credit losses | (273) | $ (161) | (2)
Unamortized premium (discount) | 8 |  | 6
Mark-to-market gains (losses) | 23 |  |
Total carrying value | 16,578 |  | 16,339
30 to 59 Days Past Due [Member] |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |
Past due | 54 |  | 30
60 to 89 Days Past Due [Member] |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |
Past due | 77 |  | 10
90 Or More Days Past Due [Member] |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |
Past due | 43 |  | 16
Commercial [Member] |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |
Current | 16,089 |  | 15,620
Allowance for credit losses | (236) | (126) |
Unamortized premium (discount) | (16) |  | (17)
Mark-to-market gains (losses) | 23 |  |
Total carrying value | 15,868 |  | 15,606
Commercial [Member] | 30 to 59 Days Past Due [Member] |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |
Past due | 8 |  | 3
Residential [Member] |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |
Current | 557 |  | 659
Allowance for credit losses | (37) | $ (35) | (2)
Unamortized premium (discount) | 24 |  | 23
Total carrying value | 710 |  | 733
Residential [Member] | 30 to 59 Days Past Due [Member] |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |
Past due | 46 |  | 27
Residential [Member] | 60 to 89 Days Past Due [Member] |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |
Past due | 77 |  | 10
Residential [Member] | 90 Or More Days Past Due [Member] |  |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |  |
Past due | $ 43 |  | $ 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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- Definition Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919230-210447 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 + Details
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