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Investments - Investments - Loan-to-Value and Debt Service Coverage Ratio by Origination Year (Details) $ in Millions | Jun. 30, 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 | 52.00% |
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 | $ 6,061 | $ 6,036
Avg. Debt-Service Coverage Ratio | 2.61 | 2.59
Commercial Loan [Member] | LTV Greater than 80 Percent |  |
Schedule of Investments [Line Items] |  |
Avg. Debt-Service Coverage Ratio | 1.93 | 1.40
Commercial Loan [Member] | 65% - 80% |  |
Schedule of Investments [Line Items] |  |
Avg. Debt-Service Coverage Ratio | 1.80 | 1.91
Commercial Loan [Member] | Less than 65% |  |
Schedule of Investments [Line Items] |  |
Avg. Debt-Service Coverage Ratio | 2.67 | 2.65
Amortized Cost [Member] | Commercial Loan [Member] |  |
Schedule of Investments [Line Items] |  |
Mortgage loans originated in current year | $ 196 | $ 855
Mortgage loans originated in year before latest fiscal year | 897 | 1,534
Mortgage loans originated two years before latest fiscal year | 1,588 | 706
Mortgage loans originated three years before latest fiscal year | 709 | 780
Mortgage loans originated four years before latest fiscal year | 777 | 545
Mortgage loans originated five or more years before latest fiscal year | 1,894 | 1,616
Financing Receivable, before Allowance for Credit Loss | 6,061 | 6,036
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 | 0
Mortgage loans originated two years before latest fiscal year | 0 | 0
Mortgage loans originated three years before latest fiscal year | 0 | 0
Mortgage loans originated four years before latest fiscal year | 0 | 0
Mortgage loans originated five or more years before latest fiscal year | 10 | 23
Financing Receivable, before Allowance for Credit Loss | 10 | 23
Amortized Cost [Member] | Commercial Loan [Member] | 65% - 80% |  |
Schedule of Investments [Line Items] |  |
Mortgage loans originated in current year | 0 | 16
Mortgage loans originated in year before latest fiscal year | 16 | 59
Mortgage loans originated two years before latest fiscal year | 58 | 43
Mortgage loans originated three years before latest fiscal year | 72 | 100
Mortgage loans originated four years before latest fiscal year | 99 | 108
Mortgage loans originated five or more years before latest fiscal year | 197 | 117
Financing Receivable, before Allowance for Credit Loss | 442 | 443
Amortized Cost [Member] | Commercial Loan [Member] | Less than 65% |  |
Schedule of Investments [Line Items] |  |
Mortgage loans originated in current year | 196 | 839
Mortgage loans originated in year before latest fiscal year | 881 | 1,475
Mortgage loans originated two years before latest fiscal year | 1,530 | 663
Mortgage loans originated three years before latest fiscal year | 637 | 680
Mortgage loans originated four years before latest fiscal year | 678 | 437
Mortgage loans originated five or more years before latest fiscal year | 1,687 | 1,476
Financing Receivable, before Allowance for Credit Loss | $ 5,609 | $ 5,570
Originated in Current Fiscal Year | Commercial Loan [Member] |  |
Schedule of Investments [Line Items] |  |
Avg. Debt-Service Coverage Ratio | 1.86 | 2.42
Originated in Current Fiscal Year | Commercial Loan [Member] | LTV Greater than 80 Percent |  |
Schedule of Investments [Line Items] |  |
Avg. Debt-Service Coverage Ratio | 0 | 0
Originated in Current Fiscal Year | Commercial Loan [Member] | 65% - 80% |  |
Schedule of Investments [Line Items] |  |
Avg. Debt-Service Coverage Ratio | 0 | 2.02
Originated in Current Fiscal Year | Commercial Loan [Member] | Less than 65% |  |
Schedule of Investments [Line Items] |  |
Avg. Debt-Service Coverage Ratio | 1.86 | 2.43
Originated in Fiscal Year Before Latest Fiscal Year | Commercial Loan [Member] |  |
Schedule of Investments [Line Items] |  |
Avg. Debt-Service Coverage Ratio | 2.44 | 2.78
Originated in Fiscal Year Before Latest Fiscal Year | Commercial Loan [Member] | LTV Greater than 80 Percent |  |
Schedule of Investments [Line Items] |  |
Avg. Debt-Service Coverage Ratio | 0 | 0
Originated in Fiscal Year Before Latest Fiscal Year | Commercial Loan [Member] | 65% - 80% |  |
Schedule of Investments [Line Items] |  |
Avg. Debt-Service Coverage Ratio | 2.02 | 2.61
Originated in Fiscal Year Before Latest Fiscal Year | Commercial Loan [Member] | Less than 65% |  |
Schedule of Investments [Line Items] |  |
Avg. Debt-Service Coverage Ratio | 2.45 | 2.79
Originated Two Years Before Latest Fiscal Year | Commercial Loan [Member] |  |
Schedule of Investments [Line Items] |  |
Avg. Debt-Service Coverage Ratio | 2.79 | 3.01
Originated Two Years Before Latest Fiscal Year | Commercial Loan [Member] | LTV Greater than 80 Percent |  |
Schedule of Investments [Line Items] |  |
Avg. Debt-Service Coverage Ratio | 0 | 0
Originated Two Years Before Latest Fiscal Year | Commercial Loan [Member] | 65% - 80% |  |
Schedule of Investments [Line Items] |  |
Avg. Debt-Service Coverage Ratio | 1.75 | 2.78
Originated Two Years Before Latest Fiscal Year | Commercial Loan [Member] | Less than 65% |  |
Schedule of Investments [Line Items] |  |
Avg. Debt-Service Coverage Ratio | 2.83 | 3.02
Originated Three Years Before Latest Fiscal Year | Commercial Loan [Member] |  |
Schedule of Investments [Line Items] |  |
Avg. Debt-Service Coverage Ratio | 3.01 | 2.66
Originated Three Years Before Latest Fiscal Year | Commercial Loan [Member] | LTV Greater than 80 Percent |  |
Schedule of Investments [Line Items] |  |
Avg. Debt-Service Coverage Ratio | 0 | 0
Originated Three Years Before Latest Fiscal Year | Commercial Loan [Member] | 65% - 80% |  |
Schedule of Investments [Line Items] |  |
Avg. Debt-Service Coverage Ratio | 2.81 | 1.95
Originated Three Years Before Latest Fiscal Year | Commercial Loan [Member] | Less than 65% |  |
Schedule of Investments [Line Items] |  |
Avg. Debt-Service Coverage Ratio | 3.03 | 2.77
Originated Four Years Before Latest Fiscal Year | Commercial Loan [Member] |  |
Schedule of Investments [Line Items] |  |
Avg. Debt-Service Coverage Ratio | 2.81 | 1.99
Originated Four Years Before Latest Fiscal Year | Commercial Loan [Member] | LTV Greater than 80 Percent |  |
Schedule of Investments [Line Items] |  |
Avg. Debt-Service Coverage Ratio | 0 | 0
Originated Four Years Before Latest Fiscal Year | Commercial Loan [Member] | 65% - 80% |  |
Schedule of Investments [Line Items] |  |
Avg. Debt-Service Coverage Ratio | 2.01 | 1.11
Originated Four Years Before Latest Fiscal Year | Commercial Loan [Member] | Less than 65% |  |
Schedule of Investments [Line Items] |  |
Avg. Debt-Service Coverage Ratio | 2.93 | 2.21
Originated Five or More Years Before Latest Fiscal Year | Commercial Loan [Member] |  |
Schedule of Investments [Line Items] |  |
Avg. Debt-Service Coverage Ratio | 2.37 | 2.48
Originated Five or More Years Before Latest Fiscal Year | Commercial Loan [Member] | LTV Greater than 80 Percent |  |
Schedule of Investments [Line Items] |  |
Avg. Debt-Service Coverage Ratio | 1.93 | 1.40
Originated Five or More Years Before Latest Fiscal Year | Commercial Loan [Member] | 65% - 80% |  |
Schedule of Investments [Line Items] |  |
Avg. Debt-Service Coverage Ratio | 1.32 | 1.91
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 | 2.50 | 2.54

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