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Investments - Investments - Loan-to-Value and Debt Service Coverage Ratio by Origination Year (Details) $ in Millions | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
--- | --- | --- | --- | ---
Schedule of Investments [Line Items] |  |  |  |
Current Weighted Average Loan to Value Ratio of Commercial Mortgage Loan | 51.00% |  |  |
Original Weighted Average Loan to Value Ratio of Commercial Mortgage loan | 59.00% |  |  |
Commercial Loan [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 5,730 | $ 5,412 |  |
Avg. Debt-Service Coverage Ratio | 2.52 | 2.48 |  |
Financing Receivable, Allowance for Credit Loss | $ 31 | $ 29 | $ 34 | $ 38
Commercial Loan [Member] | 65% - 80% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.66 | 1.61 |  |
Commercial Loan [Member] | Less than 65% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.58 | 2.55 |  |
Amortized Cost [Member] | Commercial Loan [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Mortgage loans originated in current year | $ 404 | $ 1,488 |  |
Mortgage loans originated in year before latest fiscal year | 1,517 | 695 |  |
Mortgage loans originated two years before latest fiscal year | 693 | 813 |  |
Mortgage loans originated three years before latest fiscal year | 783 | 572 |  |
Mortgage loans originated four years before latest fiscal year | 571 | 462 |  |
Mortgage loans originated five or more years before latest fiscal year | 1,762 | 1,382 |  |
Financing Receivable, before Allowance for Credit Loss | 5,730 | 5,412 |  |
Amortized Cost [Member] | Commercial Loan [Member] | 65% - 80% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Mortgage loans originated in current year | 15 | 7 |  |
Mortgage loans originated in year before latest fiscal year | 9 | 50 |  |
Mortgage loans originated two years before latest fiscal year | 51 | 91 |  |
Mortgage loans originated three years before latest fiscal year | 91 | 100 |  |
Mortgage loans originated four years before latest fiscal year | 100 | 45 |  |
Mortgage loans originated five or more years before latest fiscal year | 135 | 97 |  |
Financing Receivable, before Allowance for Credit Loss | 401 | 390 |  |
Amortized Cost [Member] | Commercial Loan [Member] | Less than 65% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Mortgage loans originated in current year | 389 | 1,481 |  |
Mortgage loans originated in year before latest fiscal year | 1,508 | 645 |  |
Mortgage loans originated two years before latest fiscal year | 642 | 722 |  |
Mortgage loans originated three years before latest fiscal year | 692 | 472 |  |
Mortgage loans originated four years before latest fiscal year | 471 | 417 |  |
Mortgage loans originated five or more years before latest fiscal year | 1,627 | 1,285 |  |
Financing Receivable, before Allowance for Credit Loss | $ 5,329 | $ 5,022 |  |
Originated in Current Fiscal Year | Commercial Loan [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.68 | 2.70 |  |
Originated in Current Fiscal Year | Commercial Loan [Member] | 65% - 80% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.02 | 2.37 |  |
Originated in Current Fiscal Year | Commercial Loan [Member] | Less than 65% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.70 | 2.70 |  |
Originated in Fiscal Year Before Latest Fiscal Year | Commercial Loan [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.72 | 2.77 |  |
Originated in Fiscal Year Before Latest Fiscal Year | Commercial Loan [Member] | 65% - 80% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.08 | 2.63 |  |
Originated in Fiscal Year Before Latest Fiscal Year | Commercial Loan [Member] | Less than 65% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.72 | 2.78 |  |
Originated Two Years Before Latest Fiscal Year | Commercial Loan [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.74 | 2.64 |  |
Originated Two Years Before Latest Fiscal Year | Commercial Loan [Member] | 65% - 80% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.67 | 1.57 |  |
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 | 2.78 |  |
Originated Three Years Before Latest Fiscal Year | Commercial Loan [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.69 | 2.02 |  |
Originated Three Years Before Latest Fiscal Year | Commercial Loan [Member] | 65% - 80% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.59 | 1.00 |  |
Originated Three Years Before Latest Fiscal Year | Commercial Loan [Member] | Less than 65% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.83 | 2.23 |  |
Originated Four Years Before Latest Fiscal Year | Commercial Loan [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.03 | 1.86 |  |
Originated Four Years Before Latest Fiscal Year | Commercial Loan [Member] | 65% - 80% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.03 | 1.37 |  |
Originated Four Years Before Latest Fiscal Year | Commercial Loan [Member] | Less than 65% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.24 | 1.91 |  |
Originated Five or More Years Before Latest Fiscal Year | Commercial Loan [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.30 | 2.41 |  |
Originated Five or More Years Before Latest Fiscal Year | Commercial Loan [Member] | 65% - 80% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.73 | 1.80 |  |
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 | 2.35 | 2.45 |  |

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