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Investmenst (Changes In Allowance For Credit Losses On Mortgage Loans On Real Estate) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Balance as of beginning-of-year | $ 204 | $ 2
Additions from provision for credit loss expense | 6 | 71
Additions (reductions) for mortgage loans on real estate for which credit losses were previously recognized | (26) |
Balance as of end-of-year | 184 | 161
Changes in economic assumptions increasing provision | (20) | 71
Accrued interest receivable excluded from credit losses | 51 | 50
Unfunded Loan Commitment [Member] |  |
Additions (reductions) for mortgage loans on real estate for which credit losses were previously recognized | 4 |
Changes in economic assumptions increasing provision |  | 1
Commercial [Member] |  |
Balance as of beginning-of-year | 187 |
Additions from provision for credit loss expense | 4 | 64
Additions (reductions) for mortgage loans on real estate for which credit losses were previously recognized | (19) |
Balance as of end-of-year | 172 | 126
Residential [Member] |  |
Balance as of beginning-of-year | 17 | 2
Additions from provision for credit loss expense | 2 | 7
Additions (reductions) for mortgage loans on real estate for which credit losses were previously recognized | (7) |
Balance as of end-of-year | $ 12 | 35
Cumulative Effect, Period of Adoption, Adjustment [Member] |  |
Balance as of end-of-year |  | 88
Cumulative Effect, Period of Adoption, Adjustment [Member] | Commercial [Member] |  |
Balance as of end-of-year |  | 62
Cumulative Effect, Period of Adoption, Adjustment [Member] | Residential [Member] |  |
Balance as of end-of-year |  | $ 26

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- Definition Amount, before allowance for credit loss, of accrued interest on financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 3B -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL120267963-210447 + 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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