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Investments - Investments - Loan-to-Value and Debt Service Coverage Ratio by Origination Year (Details) $ in Millions | Mar. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
--- | --- | --- | --- | ---
Schedule of Investments [Line Items] |  |  |  |
Current Weighted Average Loan to Value Ratio of Commercial Mortgage Loan | 56.00% |  |  |
Original Weighted Average Loan to Value Ratio of Commercial Mortgage loan | 59.00% |  |  |
Commercial Loan [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.47 | 2.47 |  |
Financing Receivable, before Allowance for Credit Loss | $ 6,399 | $ 6,440 |  |
Financing Receivable, Allowance for Credit Loss | $ 43 | $ 44 | $ 48 | $ 51
Commercial Loan [Member] | Originated in Current Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.75 | 1.52 |  |
Commercial Loan [Member] | Originated in Fiscal Year Before Latest Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.50 | 1.39 |  |
Commercial Loan [Member] | Originated Two Years Before Latest Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.41 | 2.61 |  |
Commercial Loan [Member] | Originated Three Years Before Latest Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.68 | 2.79 |  |
Commercial Loan [Member] | Originated Four Years Before Latest Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.78 | 2.82 |  |
Commercial Loan [Member] | Originated Five or More Years Before Latest Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.59 | 2.53 |  |
Commercial Loan [Member] | LTV Greater than 80 Percent |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.33 | 1.34 |  |
Commercial Loan [Member] | LTV Greater than 80 Percent | Originated in Current Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 0 | 0.63 |  |
Commercial Loan [Member] | LTV Greater than 80 Percent | Originated in Fiscal Year Before Latest Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 0.58 | 0 |  |
Commercial Loan [Member] | LTV Greater than 80 Percent | Originated Two Years Before Latest Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 0 | 1.05 |  |
Commercial Loan [Member] | LTV Greater than 80 Percent | Originated Three Years Before Latest Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.07 | 1.03 |  |
Commercial Loan [Member] | LTV Greater than 80 Percent | Originated Four Years Before Latest Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.00 | 0 |  |
Commercial Loan [Member] | LTV Greater than 80 Percent | Originated Five or More Years Before Latest Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.67 | 1.68 |  |
Commercial Loan [Member] | 65% - 80% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.30 | 2.26 |  |
Commercial Loan [Member] | 65% - 80% | Originated in Current Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 0 | 1.42 |  |
Commercial Loan [Member] | 65% - 80% | Originated in Fiscal Year Before Latest Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.31 | 1.35 |  |
Commercial Loan [Member] | 65% - 80% | Originated Two Years Before Latest Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.11 | 1.89 |  |
Commercial Loan [Member] | 65% - 80% | Originated Three Years Before Latest Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.05 | 2.55 |  |
Commercial Loan [Member] | 65% - 80% | Originated Four Years Before Latest Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.54 | 3.60 |  |
Commercial Loan [Member] | 65% - 80% | Originated Five or More Years Before Latest Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.37 | 2.01 |  |
Commercial Loan [Member] | Less than 65% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.56 | 2.57 |  |
Commercial Loan [Member] | Less than 65% | Originated in Current Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.75 | 1.62 |  |
Commercial Loan [Member] | Less than 65% | Originated in Fiscal Year Before Latest Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.61 | 1.39 |  |
Commercial Loan [Member] | Less than 65% | Originated Two Years Before Latest Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.42 | 2.85 |  |
Commercial Loan [Member] | Less than 65% | Originated Three Years Before Latest Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.86 | 2.93 |  |
Commercial Loan [Member] | Less than 65% | Originated Four Years Before Latest Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.93 | 2.67 |  |
Commercial Loan [Member] | Less than 65% | Originated Five or More Years Before Latest Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.69 | 2.71 |  |
Amortized Cost [Member] | Commercial Loan [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Mortgage loans originated in current year | $ 75 | $ 471 |  |
Mortgage loans originated in year before latest fiscal year | 504 | 496 |  |
Mortgage loans originated two years before latest fiscal year | 510 | 916 |  |
Mortgage loans originated three years before latest fiscal year | 860 | 1,566 |  |
Mortgage loans originated four years before latest fiscal year | 1,568 | 618 |  |
Mortgage loans originated five or more years before latest fiscal year | 2,882 | 2,373 |  |
Financing Receivable, before Allowance for Credit Loss | 6,399 | 6,440 |  |
Amortized Cost [Member] | Commercial Loan [Member] | LTV Greater than 80 Percent |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Mortgage loans originated in current year | 0 | 25 |  |
Mortgage loans originated in year before latest fiscal year | 26 | 0 |  |
Mortgage loans originated two years before latest fiscal year | 0 | 16 |  |
Mortgage loans originated three years before latest fiscal year | 16 | 37 |  |
Mortgage loans originated four years before latest fiscal year | 37 | 0 |  |
Mortgage loans originated five or more years before latest fiscal year | 109 | 110 |  |
Financing Receivable, before Allowance for Credit Loss | 188 | 188 |  |
Amortized Cost [Member] | Commercial Loan [Member] | 65% - 80% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Mortgage loans originated in current year | 0 | 89 |  |
Mortgage loans originated in year before latest fiscal year | 88 | 7 |  |
Mortgage loans originated two years before latest fiscal year | 7 | 204 |  |
Mortgage loans originated three years before latest fiscal year | 157 | 421 |  |
Mortgage loans originated four years before latest fiscal year | 421 | 100 |  |
Mortgage loans originated five or more years before latest fiscal year | 538 | 439 |  |
Financing Receivable, before Allowance for Credit Loss | 1,211 | 1,260 |  |
Amortized Cost [Member] | Commercial Loan [Member] | Less than 65% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Mortgage loans originated in current year | 75 | 357 |  |
Mortgage loans originated in year before latest fiscal year | 390 | 489 |  |
Mortgage loans originated two years before latest fiscal year | 503 | 696 |  |
Mortgage loans originated three years before latest fiscal year | 687 | 1,108 |  |
Mortgage loans originated four years before latest fiscal year | 1,110 | 518 |  |
Mortgage loans originated five or more years before latest fiscal year | 2,235 | 1,824 |  |
Financing Receivable, before Allowance for Credit Loss | $ 5,000 | $ 4,992 |  |

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