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Investments (Composition Of Current And Past Due Mortgage Loans On Real Estate) (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Mortgage Loans On Real Estate Aging [Abstract] |  |
Mortgage loans on real estate, gross |  | $ 16,235
Allowance for credit losses | $ (170) | (204)
Unamortized premium (discount) | 11 | 8
Mark-to-market gains (losses) | (5) | (5)
Total carrying value | 17,586 | 16,763
Current [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Mortgage loans on real estate, gross | 17,653 | 16,855
30 to 59 Days Past Due [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Mortgage loans on real estate, gross | 50 | 32
60 to 89 Days Past Due [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Mortgage loans on real estate, gross | 7 | 8
90 Or More Days Past Due [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Mortgage loans on real estate, gross | 40 | 69
Commercial [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Mortgage loans on real estate, gross | 16,998 |
Allowance for credit losses | (156) | (187)
Unamortized premium (discount) | (12) | (14)
Mark-to-market gains (losses) | (5) | (5)
Total carrying value | 16,838 | 16,043
Commercial [Member] | Current [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Mortgage loans on real estate, gross | 16,979 | 16,245
Commercial [Member] | 30 to 59 Days Past Due [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Mortgage loans on real estate, gross | 32 | 4
Residential [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Mortgage loans on real estate, gross | 762 | 737
Allowance for credit losses | (14) | (17)
Unamortized premium (discount) | 23 | 22
Total carrying value | 748 | 720
Residential [Member] | Current [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Mortgage loans on real estate, gross | 674 | 610
Residential [Member] | 30 to 59 Days Past Due [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Mortgage loans on real estate, gross | 18 | 28
Residential [Member] | 60 to 89 Days Past Due [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Mortgage loans on real estate, gross | 7 | 8
Residential [Member] | 90 Or More Days Past Due [Member] |  |
Mortgage Loans On Real Estate Aging [Abstract] |  |
Mortgage loans on real estate, gross | $ 40 | $ 69

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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 of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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