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Investments - Investments - Loan-to-Value and Debt Service Coverage Ratio by Origination Year (Details) $ in Millions | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
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Schedule of Investments [Line Items] |  |  |  |  |  |
Current Weighted Average Loan to Value Ratio of Commercial Mortgage Loan | 55.00% |  |  |  |  |
Original Weighted Average Loan to Value Ratio of Commercial Mortgage loan | 60.00% |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  |  | $ 4,215 |  |  |
Financing Receivable, Allowance for Credit Loss |  |  | 0 |  |  |
Commercial Loan [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 4,499 |  | $ 4,215 |  |  |
Avg. Debt-Service Coverage Ratio | 2.50 |  | 2.46 |  |  |
Financing Receivable, Allowance for Credit Loss | $ 38 | $ 43 | $ 0 | $ 0 | $ 0 | $ 1
Commercial Loan [Member] | 65% - 80% |  |  |  |  |  |
Schedule of Investments [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% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  |  | $ 3,839 |  |  |
Avg. Debt-Service Coverage Ratio | 2.65 |  | 2.56 |  |  |
Amortized Cost [Member] | Commercial Loan [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Mortgage loans originated in current year | $ 547 |  |  |  |  |
Mortgage loans originated in year before latest fiscal year | 920 |  |  |  |  |
Mortgage loans originated two years before latest fiscal year | 697 |  |  |  |  |
Mortgage loans originated three years before latest fiscal year | 506 |  |  |  |  |
Mortgage loans originated four years before latest fiscal year | 287 |  |  |  |  |
Mortgage loans originated five or more years before latest fiscal year | 1,542 |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 4,499 |  |  |  |  |
Amortized Cost [Member] | Commercial Loan [Member] | 65% - 80% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Mortgage loans originated in current year | 8 |  |  |  |  |
Mortgage loans originated in year before latest fiscal year | 248 |  |  |  |  |
Mortgage loans originated two years before latest fiscal year | 248 |  |  |  |  |
Mortgage loans originated three years before latest fiscal year | 80 |  |  |  |  |
Mortgage loans originated four years before latest fiscal year | 61 |  |  |  |  |
Mortgage loans originated five or more years before latest fiscal year | 165 |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 810 |  |  |  |  |
Amortized Cost [Member] | Commercial Loan [Member] | Less than 65% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Mortgage loans originated in current year | 539 |  |  |  |  |
Mortgage loans originated in year before latest fiscal year | 672 |  |  |  |  |
Mortgage loans originated two years before latest fiscal year | 449 |  |  |  |  |
Mortgage loans originated three years before latest fiscal year | 426 |  |  |  |  |
Mortgage loans originated four years before latest fiscal year | 226 |  |  |  |  |
Mortgage loans originated five or more years before latest fiscal year | 1,377 |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 3,689 |  |  |  |  |
2020 | Commercial Loan [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.49 |  |  |  |  |
2020 | Commercial Loan [Member] | 65% - 80% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.59 |  |  |  |  |
2020 | Commercial Loan [Member] | Less than 65% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.49 |  |  |  |  |
2019 | Commercial Loan [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.46 |  |  |  |  |
2019 | Commercial Loan [Member] | 65% - 80% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.81 |  |  |  |  |
2019 | Commercial Loan [Member] | Less than 65% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.70 |  |  |  |  |
2018 | Commercial Loan [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.98 |  |  |  |  |
2018 | Commercial Loan [Member] | 65% - 80% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.96 |  |  |  |  |
2018 | Commercial Loan [Member] | Less than 65% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.99 |  |  |  |  |
2017 | Commercial Loan [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.86 |  |  |  |  |
2017 | Commercial Loan [Member] | 65% - 80% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.73 |  |  |  |  |
2017 | Commercial Loan [Member] | Less than 65% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.89 |  |  |  |  |
2016 | Commercial Loan [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.79 |  |  |  |  |
2016 | Commercial Loan [Member] | 65% - 80% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.99 |  |  |  |  |
2016 | Commercial Loan [Member] | Less than 65% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 3.01 |  |  |  |  |
2015 & prior | Commercial Loan [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.93 |  |  |  |  |
2015 & prior | Commercial Loan [Member] | 65% - 80% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.73 |  |  |  |  |
2015 & prior | Commercial Loan [Member] | Less than 65% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 3.07 |  |  |  |  |

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