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Investments - Investments - Commercial Mortgage Loans Credit Quality (Details) $ in Millions | Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | $ 4,215
Commercial Loan [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 4,499 | $ 4,215
Avg. Debt-Service Coverage Ratio | 2.50 | 2.46
Commercial Loan [Member] | 65% - 80% |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | $ 376
Avg. Debt-Service Coverage Ratio | 1.85 | 1.53
Commercial Loan [Member] | Less than 65% |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | $ 3,839
Avg. Debt-Service Coverage Ratio | 2.65 | 2.56

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- Definition Amount, before allowance for credit loss, of financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 Reference 2: 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=121599337&loc=SL82919230-210447 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 80 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922355-210448 + Details
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