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Investments - Investments - Loan-to-Value and Debt Service Coverage Ratio by Origination Year (Details) $ in Millions | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
--- | --- | --- | --- | ---
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 | 61.00% |  |  |
Commercial Loan [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 4,622 | $ 4,531 |  |
Avg. Debt-Service Coverage Ratio | 2.35 | 2.52 |  |
Financing Receivable, Allowance for Credit Loss | $ 34 | $ 38 | $ 21 | $ 0
Commercial Loan [Member] | 65% - 80% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.59 | 1.59 |  |
Commercial Loan [Member] | Less than 65% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.49 | 2.69 |  |
Amortized Cost [Member] | Commercial Loan [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Mortgage loans originated in current year | $ 175 | $ 687 |  |
Mortgage loans originated in year before latest fiscal year | 694 | 919 |  |
Mortgage loans originated two years before latest fiscal year | 918 | 622 |  |
Mortgage loans originated three years before latest fiscal year | 620 | 491 |  |
Mortgage loans originated four years before latest fiscal year | 468 | 286 |  |
Mortgage loans originated five or more years before latest fiscal year | 1,747 | 1,526 |  |
Financing Receivable, before Allowance for Credit Loss | 4,622 | 4,531 |  |
Amortized Cost [Member] | Commercial Loan [Member] | 65% - 80% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Mortgage loans originated in current year | 26 | 28 |  |
Mortgage loans originated in year before latest fiscal year | 57 | 243 |  |
Mortgage loans originated two years before latest fiscal year | 223 | 212 |  |
Mortgage loans originated three years before latest fiscal year | 210 | 45 |  |
Mortgage loans originated four years before latest fiscal year | 45 | 51 |  |
Mortgage loans originated five or more years before latest fiscal year | 166 | 115 |  |
Financing Receivable, before Allowance for Credit Loss | 727 | 694 |  |
Amortized Cost [Member] | Commercial Loan [Member] | Less than 65% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Mortgage loans originated in current year | 149 | 659 |  |
Mortgage loans originated in year before latest fiscal year | 637 | 676 |  |
Mortgage loans originated two years before latest fiscal year | 695 | 410 |  |
Mortgage loans originated three years before latest fiscal year | 410 | 446 |  |
Mortgage loans originated four years before latest fiscal year | 423 | 235 |  |
Mortgage loans originated five or more years before latest fiscal year | 1,581 | 1,411 |  |
Financing Receivable, before Allowance for Credit Loss | $ 3,895 | $ 3,837 |  |
Originated in Current Fiscal Year | Commercial Loan [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.57 | 2.52 |  |
Originated in Current Fiscal Year | Commercial Loan [Member] | 65% - 80% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.28 | 1.62 |  |
Originated in Current Fiscal Year | Commercial Loan [Member] | Less than 65% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.62 | 2.56 |  |
Originated in Fiscal Year Before Latest Fiscal Year | Commercial Loan [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.66 | 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 | 2.12 | 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 | 2.71 | 2.85 |  |
Originated Two Years Before Latest Fiscal Year | Commercial Loan [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.46 | 1.94 |  |
Originated Two Years Before Latest Fiscal Year | Commercial Loan [Member] | 65% - 80% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.59 | 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 | 2.74 | 2.25 |  |
Originated Three Years Before Latest Fiscal Year | Commercial Loan [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.87 | 1.90 |  |
Originated Three Years Before Latest Fiscal Year | Commercial Loan [Member] | 65% - 80% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.32 | 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 | 2.16 | 1.89 |  |
Originated Four Years Before Latest Fiscal Year | Commercial Loan [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.88 | 2.80 |  |
Originated Four Years Before Latest Fiscal Year | Commercial Loan [Member] | 65% - 80% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.83 | 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 | 2.44 | 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 | 1.57 | 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 | 2.53 | 3.01 |  |

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