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Investments - Investments - Loan-to-Value and Debt Service Coverage Ratio by Origination Year (Details) $ in Millions | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
--- | --- | --- | --- | --- | --- | ---
Schedule of Investments [Line Items] |  |  |  |  |  |
Current Weighted Average Loan to Value Ratio of Commercial Mortgage Loan | 52.00% |  |  |  |  |
Original Weighted Average Loan to Value Ratio of Commercial Mortgage loan | 60.00% |  |  |  |  |
Commercial Loan [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 5,132 |  | $ 4,531 |  |  |
Avg. Debt-Service Coverage Ratio | 2.47 |  | 2.52 |  |  |
Financing Receivable, Allowance for Credit Loss | $ 26 | $ 24 | $ 38 | $ 38 | $ 43 | $ 0
Commercial Loan [Member] | 65% - 80% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.52 |  | 1.59 |  |  |
Commercial Loan [Member] | Less than 65% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.55 |  | 2.69 |  |  |
Amortized Cost [Member] | Commercial Loan [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Mortgage loans originated in current year | $ 1,023 |  | $ 687 |  |  |
Mortgage loans originated in year before latest fiscal year | 705 |  | 919 |  |  |
Mortgage loans originated two years before latest fiscal year | 863 |  | 622 |  |  |
Mortgage loans originated three years before latest fiscal year | 596 |  | 491 |  |  |
Mortgage loans originated four years before latest fiscal year | 464 |  | 286 |  |  |
Mortgage loans originated five or more years before latest fiscal year | 1,481 |  | 1,526 |  |  |
Financing Receivable, before Allowance for Credit Loss | 5,132 |  | 4,531 |  |  |
Amortized Cost [Member] | Commercial Loan [Member] | 65% - 80% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Mortgage loans originated in current year | 3 |  | 28 |  |  |
Mortgage loans originated in year before latest fiscal year | 51 |  | 243 |  |  |
Mortgage loans originated two years before latest fiscal year | 91 |  | 212 |  |  |
Mortgage loans originated three years before latest fiscal year | 111 |  | 45 |  |  |
Mortgage loans originated four years before latest fiscal year | 45 |  | 51 |  |  |
Mortgage loans originated five or more years before latest fiscal year | 125 |  | 115 |  |  |
Financing Receivable, before Allowance for Credit Loss | 426 |  | 694 |  |  |
Amortized Cost [Member] | Commercial Loan [Member] | Less than 65% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Mortgage loans originated in current year | 1,020 |  | 659 |  |  |
Mortgage loans originated in year before latest fiscal year | 654 |  | 676 |  |  |
Mortgage loans originated two years before latest fiscal year | 772 |  | 410 |  |  |
Mortgage loans originated three years before latest fiscal year | 485 |  | 446 |  |  |
Mortgage loans originated four years before latest fiscal year | 419 |  | 235 |  |  |
Mortgage loans originated five or more years before latest fiscal year | 1,356 |  | 1,411 |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 4,706 |  | $ 3,837 |  |  |
Originated in Current Fiscal Year | Commercial Loan [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.86 |  | 2.52 |  |  |
Originated in Current Fiscal Year | Commercial Loan [Member] | 65% - 80% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.25 |  | 1.62 |  |  |
Originated in Current Fiscal Year | Commercial Loan [Member] | Less than 65% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.86 |  | 2.56 |  |  |
Originated in Fiscal Year Before Latest Fiscal Year | Commercial Loan [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.75 |  | 2.51 |  |  |
Originated in Fiscal Year Before Latest Fiscal Year | Commercial Loan [Member] | 65% - 80% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.63 |  | 1.58 |  |  |
Originated in Fiscal Year Before Latest Fiscal Year | Commercial Loan [Member] | Less than 65% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.76 |  | 2.85 |  |  |
Originated Two Years Before Latest Fiscal Year | Commercial Loan [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.57 |  | 1.94 |  |  |
Originated Two Years Before Latest Fiscal Year | Commercial Loan [Member] | 65% - 80% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.37 |  | 1.33 |  |  |
Originated Two Years Before Latest Fiscal Year | Commercial Loan [Member] | Less than 65% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.71 |  | 2.25 |  |  |
Originated Three Years Before Latest Fiscal Year | Commercial Loan [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.99 |  | 1.90 |  |  |
Originated Three Years Before Latest Fiscal Year | Commercial Loan [Member] | 65% - 80% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.04 |  | 2.02 |  |  |
Originated Three Years Before Latest Fiscal Year | Commercial Loan [Member] | Less than 65% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.21 |  | 1.89 |  |  |
Originated Four Years Before Latest Fiscal Year | Commercial Loan [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.87 |  | 2.80 |  |  |
Originated Four Years Before Latest Fiscal Year | Commercial Loan [Member] | 65% - 80% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.75 |  | 1.92 |  |  |
Originated Four Years Before Latest Fiscal Year | Commercial Loan [Member] | Less than 65% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.88 |  | 2.99 |  |  |
Originated Five or More Years Before Latest Fiscal Year | Commercial Loan [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.38 |  | 2.92 |  |  |
Originated Five or More Years Before Latest Fiscal Year | Commercial Loan [Member] | 65% - 80% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.52 |  | 1.74 |  |  |
Originated Five or More Years Before Latest Fiscal Year | Commercial Loan [Member] | Less than 65% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.46 |  | 3.01 |  |  |

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