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Investments - Investments - Loan-to-Value and Debt Service Coverage Ratio by Origination Year (Details) $ in Millions | Sep. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
--- | --- | --- | --- | --- | --- | ---
Schedule of Investments [Line Items] |  |  |  |  |  |
Current Weighted Average Loan to Value Ratio of Commercial Mortgage Loan | 50.00% |  |  |  |  |
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 | $ 5,967 |  | $ 5,412 |  |  |
Avg. Debt-Service Coverage Ratio | 2.60 |  | 2.48 |  |  |
Financing Receivable, Allowance for Credit Loss | $ 36 | $ 36 | $ 29 | $ 26 | $ 24 | $ 38
Commercial Loan [Member] | 65% - 80% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.58 |  | 1.61 |  |  |
Commercial Loan [Member] | Less than 65% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.66 |  | 2.55 |  |  |
Amortized Cost [Member] | Commercial Loan [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Mortgage loans originated in current year | $ 719 |  | $ 1,488 |  |  |
Mortgage loans originated in year before latest fiscal year | 1,496 |  | 695 |  |  |
Mortgage loans originated two years before latest fiscal year | 703 |  | 813 |  |  |
Mortgage loans originated three years before latest fiscal year | 781 |  | 572 |  |  |
Mortgage loans originated four years before latest fiscal year | 546 |  | 462 |  |  |
Mortgage loans originated five or more years before latest fiscal year | 1,722 |  | 1,382 |  |  |
Financing Receivable, before Allowance for Credit Loss | 5,967 |  | 5,412 |  |  |
Amortized Cost [Member] | Commercial Loan [Member] | 65% - 80% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Mortgage loans originated in current year | 16 |  | 7 |  |  |
Mortgage loans originated in year before latest fiscal year | 0 |  | 50 |  |  |
Mortgage loans originated two years before latest fiscal year | 22 |  | 91 |  |  |
Mortgage loans originated three years before latest fiscal year | 70 |  | 100 |  |  |
Mortgage loans originated four years before latest fiscal year | 108 |  | 45 |  |  |
Mortgage loans originated five or more years before latest fiscal year | 89 |  | 97 |  |  |
Financing Receivable, before Allowance for Credit Loss | 305 |  | 390 |  |  |
Amortized Cost [Member] | Commercial Loan [Member] | Less than 65% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Mortgage loans originated in current year | 703 |  | 1,481 |  |  |
Mortgage loans originated in year before latest fiscal year | 1,496 |  | 645 |  |  |
Mortgage loans originated two years before latest fiscal year | 681 |  | 722 |  |  |
Mortgage loans originated three years before latest fiscal year | 711 |  | 472 |  |  |
Mortgage loans originated four years before latest fiscal year | 438 |  | 417 |  |  |
Mortgage loans originated five or more years before latest fiscal year | 1,633 |  | 1,285 |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 5,662 |  | $ 5,022 |  |  |
Originated in Current Fiscal Year | Commercial Loan [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.59 |  | 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 | 2.61 |  | 2.70 |  |  |
Originated in Fiscal Year Before Latest Fiscal Year | Commercial Loan [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.85 |  | 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 | 0 |  | 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 | 2.85 |  | 2.78 |  |  |
Originated Two Years Before Latest Fiscal Year | Commercial Loan [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.91 |  | 2.64 |  |  |
Originated Two Years Before Latest Fiscal Year | Commercial Loan [Member] | 65% - 80% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.66 |  | 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 | 2.92 |  | 2.78 |  |  |
Originated Three Years Before Latest Fiscal Year | Commercial Loan [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.73 |  | 2.02 |  |  |
Originated Three Years Before Latest Fiscal Year | Commercial Loan [Member] | 65% - 80% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.36 |  | 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 | 2.87 |  | 2.23 |  |  |
Originated Four Years Before Latest Fiscal Year | Commercial Loan [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.02 |  | 1.86 |  |  |
Originated Four Years Before Latest Fiscal Year | Commercial Loan [Member] | 65% - 80% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.11 |  | 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 | 2.39 |  | 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 | 2.00 |  | 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 | 2.41 |  | 2.45 |  |  |

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