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Investments - Investments - Loan-to-Value and Debt Service Coverage Ratio by Origination Year (Details) $ in Millions | Jun. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Jun. 30, 2023 USD ($) | 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 | 2.57 |  | 2.60 |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 6,405 |  | $ 6,138 |  |  |
Financing Receivable, Allowance for Credit Loss | $ 48 | $ 48 | $ 51 | $ 41 | $ 36 | $ 36
Commercial Loan [Member] | Originated in Current Fiscal Year |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.65 |  | 1.47 |  |  |
Commercial Loan [Member] | Originated in Fiscal Year Before Latest Fiscal Year |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.42 |  | 2.60 |  |  |
Commercial Loan [Member] | Originated Two Years Before Latest Fiscal Year |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.60 |  | 2.78 |  |  |
Commercial Loan [Member] | Originated Three Years Before Latest Fiscal Year |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.86 |  | 3.00 |  |  |
Commercial Loan [Member] | Originated Four Years Before Latest Fiscal Year |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 3.11 |  | 2.76 |  |  |
Commercial Loan [Member] | Originated Five or More Years Before Latest Fiscal Year |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.56 |  | 2.47 |  |  |
Commercial Loan [Member] | LTV Greater than 80 Percent |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 0.91 |  | 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 | 1.03 |  | 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 | 0.83 |  | 1.41 |  |  |
Commercial Loan [Member] | 65% - 80% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.20 |  | 2.25 |  |  |
Commercial Loan [Member] | 65% - 80% | Originated in Current Fiscal Year |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.31 |  | 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 | 2.12 |  | 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 | 3.58 |  | 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 | 1.80 |  | 1.77 |  |  |
Commercial Loan [Member] | Less than 65% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.71 |  | 2.72 |  |  |
Commercial Loan [Member] | Less than 65% | Originated in Current Fiscal Year |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.69 |  | 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 | 1.42 |  | 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 | 2.76 |  | 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 | 3.17 |  | 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 | 3.03 |  | 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 | $ 279 |  | $ 400 |  |  |
Mortgage loans originated in year before latest fiscal year | 466 |  | 929 |  |  |
Mortgage loans originated two years before latest fiscal year | 951 |  | 1,600 |  |  |
Mortgage loans originated three years before latest fiscal year | 1,570 |  | 622 |  |  |
Mortgage loans originated four years before latest fiscal year | 620 |  | 777 |  |  |
Mortgage loans originated five or more years before latest fiscal year | 2,519 |  | 1,810 |  |  |
Financing Receivable, before Allowance for Credit Loss | 6,405 |  | 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 | 103 |  | 105 |  |  |
Financing Receivable, before Allowance for Credit Loss | 157 |  | 159 |  |  |
Amortized Cost [Member] | Commercial Loan [Member] | 65% - 80% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Mortgage loans originated in current year | 31 |  | 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 | 488 |  | 95 |  |  |
Mortgage loans originated four years before latest fiscal year | 89 |  | 98 |  |  |
Mortgage loans originated five or more years before latest fiscal year | 363 |  | 252 |  |  |
Financing Receivable, before Allowance for Credit Loss | 1,160 |  | 1,091 |  |  |
Amortized Cost [Member] | Commercial Loan [Member] | Less than 65% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Mortgage loans originated in current year | 248 |  | 400 |  |  |
Mortgage loans originated in year before latest fiscal year | 466 |  | 724 |  |  |
Mortgage loans originated two years before latest fiscal year | 746 |  | 1,105 |  |  |
Mortgage loans originated three years before latest fiscal year | 1,044 |  | 527 |  |  |
Mortgage loans originated four years before latest fiscal year | 531 |  | 679 |  |  |
Mortgage loans originated five or more years before latest fiscal year | 2,053 |  | 1,453 |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 5,088 |  | $ 4,888 |  |  |

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