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Investments - Investments - Loan-to-Value and Debt Service Coverage Ratio by Origination Year (Details) $ in Millions | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
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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 | 59.00% |  |  |
Commercial Loan [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.60 | 2.60 |  |
Financing Receivable, before Allowance for Credit Loss | $ 6,245 | $ 6,138 |  |
Financing Receivable, Allowance for Credit Loss | $ 48 | $ 51 | $ 36 | $ 36
Commercial Loan [Member] | Originated in Current Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.62 | 1.47 |  |
Commercial Loan [Member] | Originated in Fiscal Year Before Latest Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.45 | 2.60 |  |
Commercial Loan [Member] | Originated Two Years Before Latest Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.63 | 2.78 |  |
Commercial Loan [Member] | Originated Three Years Before Latest Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.84 | 3.00 |  |
Commercial Loan [Member] | Originated Four Years Before Latest Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.99 | 2.76 |  |
Commercial Loan [Member] | Originated Five or More Years Before Latest Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.57 | 2.47 |  |
Commercial Loan [Member] | LTV Greater than 80 Percent |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 0.95 | 1.29 |  |
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 |  |
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 | 1.09 |  |
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 | 1.14 | 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 | 1.05 | 0 |  |
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 | 0 | 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 | 0.89 | 1.41 |  |
Commercial Loan [Member] | 65% - 80% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.24 | 2.25 |  |
Commercial Loan [Member] | 65% - 80% | Originated in Current Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 0 | 0 |  |
Commercial Loan [Member] | 65% - 80% | Originated in Fiscal Year Before Latest Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 0 | 2.13 |  |
Commercial Loan [Member] | 65% - 80% | Originated Two Years Before Latest Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.20 | 2.42 |  |
Commercial Loan [Member] | 65% - 80% | Originated Three Years Before Latest Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.35 | 3.47 |  |
Commercial Loan [Member] | 65% - 80% | Originated Four Years Before Latest Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 3.48 | 1.77 |  |
Commercial Loan [Member] | 65% - 80% | Originated Five or More Years Before Latest Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.77 | 1.77 |  |
Commercial Loan [Member] | Less than 65% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.73 | 2.72 |  |
Commercial Loan [Member] | Less than 65% | Originated in Current Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.62 | 1.47 |  |
Commercial Loan [Member] | Less than 65% | Originated in Fiscal Year Before Latest Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.45 | 2.75 |  |
Commercial Loan [Member] | Less than 65% | Originated Two Years Before Latest Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.77 | 2.99 |  |
Commercial Loan [Member] | Less than 65% | Originated Three Years Before Latest Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 3.13 | 2.92 |  |
Commercial Loan [Member] | Less than 65% | Originated Four Years Before Latest Fiscal Year |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.91 | 2.90 |  |
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 | 2.78 | 2.67 |  |
Amortized Cost [Member] | Commercial Loan [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Mortgage loans originated in current year | $ 98 | $ 400 |  |
Mortgage loans originated in year before latest fiscal year | 434 | 929 |  |
Mortgage loans originated two years before latest fiscal year | 940 | 1,600 |  |
Mortgage loans originated three years before latest fiscal year | 1,589 | 622 |  |
Mortgage loans originated four years before latest fiscal year | 621 | 777 |  |
Mortgage loans originated five or more years before latest fiscal year | 2,563 | 1,810 |  |
Financing Receivable, before Allowance for Credit Loss | 6,245 | 6,138 |  |
Amortized Cost [Member] | Commercial Loan [Member] | LTV Greater than 80 Percent |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Mortgage loans originated in current year | 0 | 0 |  |
Mortgage loans originated in year before latest fiscal year | 0 | 16 |  |
Mortgage loans originated two years before latest fiscal year | 16 | 38 |  |
Mortgage loans originated three years before latest fiscal year | 38 | 0 |  |
Mortgage loans originated four years before latest fiscal year | 0 | 0 |  |
Mortgage loans originated five or more years before latest fiscal year | 104 | 105 |  |
Financing Receivable, before Allowance for Credit Loss | 158 | 159 |  |
Amortized Cost [Member] | Commercial Loan [Member] | 65% - 80% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Mortgage loans originated in current year | 0 | 0 |  |
Mortgage loans originated in year before latest fiscal year | 0 | 189 |  |
Mortgage loans originated two years before latest fiscal year | 189 | 457 |  |
Mortgage loans originated three years before latest fiscal year | 489 | 95 |  |
Mortgage loans originated four years before latest fiscal year | 94 | 98 |  |
Mortgage loans originated five or more years before latest fiscal year | 349 | 252 |  |
Financing Receivable, before Allowance for Credit Loss | 1,121 | 1,091 |  |
Amortized Cost [Member] | Commercial Loan [Member] | Less than 65% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Mortgage loans originated in current year | 98 | 400 |  |
Mortgage loans originated in year before latest fiscal year | 434 | 724 |  |
Mortgage loans originated two years before latest fiscal year | 735 | 1,105 |  |
Mortgage loans originated three years before latest fiscal year | 1,062 | 527 |  |
Mortgage loans originated four years before latest fiscal year | 527 | 679 |  |
Mortgage loans originated five or more years before latest fiscal year | 2,110 | 1,453 |  |
Financing Receivable, before Allowance for Credit Loss | $ 4,966 | $ 4,888 |  |

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