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Investments - Investments - Loan-to-Value and Debt Service Coverage Ratio by Origination Year (Details) $ in Millions | Mar. 31, 2020 USD ($) | Jan. 01, 2020 USD ($) | Dec. 31, 2019 USD ($)
--- | --- | --- | ---
Schedule of Investments [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss |  | $ 4,215 | $ 4,215
Commercial Loan [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 4,374 |  | $ 4,215
Avg. Debt-Service Coverage Ratio | 2.48 |  | 2.46
Commercial Loan [Member] | 65% - 80% |  |  |
Schedule of Investments [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss |  |  | $ 376
Avg. Debt-Service Coverage Ratio | 1.57 |  | 1.53
Commercial Loan [Member] | Less than 65% |  |  |
Schedule of Investments [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss |  |  | $ 3,839
Avg. Debt-Service Coverage Ratio | 2.56 |  | 2.56
Amortized Cost [Member] | Commercial Loan [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Mortgage loans originated in current year | $ 202 |  |
Mortgage loans originated in year before latest fiscal year | 988 |  |
Mortgage loans originated two years before latest fiscal year | 698 |  |
Mortgage loans originated three years before latest fiscal year | 510 |  |
Mortgage loans originated four years before latest fiscal year | 288 |  |
Mortgage loans originated five or more years before latest fiscal year | 1,688 |  |
Financing Receivable, before Allowance for Credit Loss | 4,374 |  | $ 4,200
Amortized Cost [Member] | Commercial Loan [Member] | 65% - 80% |  |  |
Schedule of Investments [Line Items] |  |  |
Mortgage loans originated in current year | 0 |  |
Mortgage loans originated in year before latest fiscal year | 90 |  |
Mortgage loans originated two years before latest fiscal year | 175 |  |
Mortgage loans originated three years before latest fiscal year | 48 |  |
Mortgage loans originated four years before latest fiscal year | 33 |  |
Mortgage loans originated five or more years before latest fiscal year | 16 |  |
Financing Receivable, before Allowance for Credit Loss | 362 |  |
Amortized Cost [Member] | Commercial Loan [Member] | Less than 65% |  |  |
Schedule of Investments [Line Items] |  |  |
Mortgage loans originated in current year | 202 |  |
Mortgage loans originated in year before latest fiscal year | 898 |  |
Mortgage loans originated two years before latest fiscal year | 523 |  |
Mortgage loans originated three years before latest fiscal year | 462 |  |
Mortgage loans originated four years before latest fiscal year | 255 |  |
Mortgage loans originated five or more years before latest fiscal year | 1,672 |  |
Financing Receivable, before Allowance for Credit Loss | $ 4,012 |  |
2020 | Commercial Loan [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Avg. Debt-Service Coverage Ratio | 2.51 |  |
2020 | Commercial Loan [Member] | 65% - 80% |  |  |
Schedule of Investments [Line Items] |  |  |
Avg. Debt-Service Coverage Ratio | 0 |  |
2020 | Commercial Loan [Member] | Less than 65% |  |  |
Schedule of Investments [Line Items] |  |  |
Avg. Debt-Service Coverage Ratio | 2.51 |  |
2019 | Commercial Loan [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Avg. Debt-Service Coverage Ratio | 2.43 |  |
2019 | Commercial Loan [Member] | 65% - 80% |  |  |
Schedule of Investments [Line Items] |  |  |
Avg. Debt-Service Coverage Ratio | 1.48 |  |
2019 | Commercial Loan [Member] | Less than 65% |  |  |
Schedule of Investments [Line Items] |  |  |
Avg. Debt-Service Coverage Ratio | 2.52 |  |
2018 | Commercial Loan [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Avg. Debt-Service Coverage Ratio | 1.96 |  |
2018 | Commercial Loan [Member] | 65% - 80% |  |  |
Schedule of Investments [Line Items] |  |  |
Avg. Debt-Service Coverage Ratio | 1.80 |  |
2018 | Commercial Loan [Member] | Less than 65% |  |  |
Schedule of Investments [Line Items] |  |  |
Avg. Debt-Service Coverage Ratio | 2.01 |  |
2017 | Commercial Loan [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Avg. Debt-Service Coverage Ratio | 1.91 |  |
2017 | Commercial Loan [Member] | 65% - 80% |  |  |
Schedule of Investments [Line Items] |  |  |
Avg. Debt-Service Coverage Ratio | 1.06 |  |
2017 | Commercial Loan [Member] | Less than 65% |  |  |
Schedule of Investments [Line Items] |  |  |
Avg. Debt-Service Coverage Ratio | 2.00 |  |
2016 | Commercial Loan [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Avg. Debt-Service Coverage Ratio | 2.66 |  |
2016 | Commercial Loan [Member] | 65% - 80% |  |  |
Schedule of Investments [Line Items] |  |  |
Avg. Debt-Service Coverage Ratio | 1.35 |  |
2016 | Commercial Loan [Member] | Less than 65% |  |  |
Schedule of Investments [Line Items] |  |  |
Avg. Debt-Service Coverage Ratio | 2.83 |  |
2015 & prior | Commercial Loan [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Avg. Debt-Service Coverage Ratio | 2.86 |  |
2015 & prior | Commercial Loan [Member] | 65% - 80% |  |  |
Schedule of Investments [Line Items] |  |  |
Avg. Debt-Service Coverage Ratio | 1.52 |  |
2015 & prior | Commercial Loan [Member] | Less than 65% |  |  |
Schedule of Investments [Line Items] |  |  |
Avg. Debt-Service Coverage Ratio | 2.87 |  |

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