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Investments - Investments - Commercial Mortgage Loans Credit Quality (Details) $ in Millions | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
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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 | $ 4,442 | $ 4,215
Avg. Debt-Service Coverage Ratio | 2.46 | 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 | 1.89 | 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 | 2.59 | 2.56

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