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Investments - Schedule of Residential Mortgage Loans with Credit Quality Indicators, Performing or Nonperforming (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2021
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Schedule of Investments [Line Items] |  |  |  |
Allowance for credit loss | $ (60) | $ (42) | $ (32) | $ (31)
Total mortgage loans | 4,984 | 4,554 |  |
Residential mortgage loans |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 2,574 | $ 2,180 |  |
% of Total | 100.00% | 100.00% |  |
Allowance for credit loss | $ (48) | $ (32) | $ (26) | $ (25)
Allowance for expected credit loss, % of Total | 0.00% | 0.00% |  |
Total mortgage loans | $ 2,526 | $ 2,148 |  |
Total residential mortgage loans, net of valuation allowance, % of Total | 100.00% | 100.00% |  |
Performing Financial Instruments | Residential mortgage loans |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 2,511 | $ 2,118 |  |
% of Total | 98.00% | 97.00% |  |
Nonperforming Financial Instruments | Residential mortgage loans |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 63 | $ 62 |  |
% of Total | 2.00% | 3.00% |  |

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