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Investments - Investments - Loan-to-Value and Debt Service Coverage Ratio by Origination Year (Details) $ in Millions | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
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Schedule of Investments [Line Items] |  |  |  |  |  |
Current Weighted Average Loan to Value Ratio of Commercial Mortgage Loan | 54.00% |  |  |  |  |
Original Weighted Average Loan to Value Ratio of Commercial Mortgage loan | 60.00% |  |  |  |  |
Commercial Loan [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 4,900 |  | $ 4,531 |  |  |
Avg. Debt-Service Coverage Ratio | 2.42 |  | 2.52 |  |  |
Financing Receivable, Allowance for Credit Loss | $ 24 | $ 34 | $ 38 | $ 43 | $ 21 | $ 0
Commercial Loan [Member] | 65% - 80% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.54 |  | 1.59 |  |  |
Commercial Loan [Member] | Less than 65% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.55 |  | 2.69 |  |  |
Amortized Cost [Member] | Commercial Loan [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Mortgage loans originated in current year | $ 713 |  | $ 687 |  |  |
Mortgage loans originated in year before latest fiscal year | 699 |  | 919 |  |  |
Mortgage loans originated two years before latest fiscal year | 917 |  | 622 |  |  |
Mortgage loans originated three years before latest fiscal year | 603 |  | 491 |  |  |
Mortgage loans originated four years before latest fiscal year | 466 |  | 286 |  |  |
Mortgage loans originated five or more years before latest fiscal year | 1,502 |  | 1,526 |  |  |
Financing Receivable, before Allowance for Credit Loss | 4,900 |  | 4,531 |  |  |
Amortized Cost [Member] | Commercial Loan [Member] | 65% - 80% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Mortgage loans originated in current year | 0 |  | 28 |  |  |
Mortgage loans originated in year before latest fiscal year | 57 |  | 243 |  |  |
Mortgage loans originated two years before latest fiscal year | 187 |  | 212 |  |  |
Mortgage loans originated three years before latest fiscal year | 175 |  | 45 |  |  |
Mortgage loans originated four years before latest fiscal year | 45 |  | 51 |  |  |
Mortgage loans originated five or more years before latest fiscal year | 140 |  | 115 |  |  |
Financing Receivable, before Allowance for Credit Loss | 604 |  | 694 |  |  |
Amortized Cost [Member] | Commercial Loan [Member] | Less than 65% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Mortgage loans originated in current year | 713 |  | 659 |  |  |
Mortgage loans originated in year before latest fiscal year | 642 |  | 676 |  |  |
Mortgage loans originated two years before latest fiscal year | 730 |  | 410 |  |  |
Mortgage loans originated three years before latest fiscal year | 428 |  | 446 |  |  |
Mortgage loans originated four years before latest fiscal year | 421 |  | 235 |  |  |
Mortgage loans originated five or more years before latest fiscal year | 1,362 |  | 1,411 |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 4,296 |  | $ 3,837 |  |  |
Originated in Current Fiscal Year | Commercial Loan [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.93 |  | 2.52 |  |  |
Originated in Current Fiscal Year | Commercial Loan [Member] | 65% - 80% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 0 |  | 1.62 |  |  |
Originated in Current Fiscal Year | Commercial Loan [Member] | Less than 65% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.93 |  | 2.56 |  |  |
Originated in Fiscal Year Before Latest Fiscal Year | Commercial Loan [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.64 |  | 2.51 |  |  |
Originated in Fiscal Year Before Latest Fiscal Year | Commercial Loan [Member] | 65% - 80% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.13 |  | 1.58 |  |  |
Originated in Fiscal Year Before Latest Fiscal Year | Commercial Loan [Member] | Less than 65% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.69 |  | 2.85 |  |  |
Originated Two Years Before Latest Fiscal Year | Commercial Loan [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.49 |  | 1.94 |  |  |
Originated Two Years Before Latest Fiscal Year | Commercial Loan [Member] | 65% - 80% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.61 |  | 1.33 |  |  |
Originated Two Years Before Latest Fiscal Year | Commercial Loan [Member] | Less than 65% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.71 |  | 2.25 |  |  |
Originated Three Years Before Latest Fiscal Year | Commercial Loan [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.93 |  | 1.90 |  |  |
Originated Three Years Before Latest Fiscal Year | Commercial Loan [Member] | 65% - 80% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.25 |  | 2.02 |  |  |
Originated Three Years Before Latest Fiscal Year | Commercial Loan [Member] | Less than 65% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.22 |  | 1.89 |  |  |
Originated Four Years Before Latest Fiscal Year | Commercial Loan [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.84 |  | 2.80 |  |  |
Originated Four Years Before Latest Fiscal Year | Commercial Loan [Member] | 65% - 80% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.75 |  | 1.92 |  |  |
Originated Four Years Before Latest Fiscal Year | Commercial Loan [Member] | Less than 65% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.85 |  | 2.99 |  |  |
Originated Five or More Years Before Latest Fiscal Year | Commercial Loan [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.42 |  | 2.92 |  |  |
Originated Five or More Years Before Latest Fiscal Year | Commercial Loan [Member] | 65% - 80% |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.51 |  | 1.74 |  |  |
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 | 2.51 |  | 3.01 |  |  |

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