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Investments - Schedule of Residential Mortgage Loans with Credit Quality Indicators, Performing or Nonperforming (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Schedule of Investments [Line Items] |  |  |  |  |  |
Allowance for expected loan loss | $ (64) | $ (67) | $ (66) | $ (64) | $ (60) | $ (42)
Total mortgage loans | 5,439 |  | 5,336 |  |  |
Residential Mortgage Loans |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Amortized Cost | $ 2,929 |  | $ 2,852 |  |  |
% of Total | 100.00% |  | 100.00% |  |  |
Allowance for expected loan loss | $ (50) | $ (54) | $ (54) | $ (51) | $ (48) | $ (32)
Total mortgage loans | 2,879 |  | 2,798 |  |  |
Performing Financial Instruments | Residential Mortgage Loans |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Amortized Cost | $ 2,867 |  | $ 2,795 |  |  |
% of Total | 98.00% |  | 98.00% |  |  |
Nonperforming Financial Instruments | Residential Mortgage Loans |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Amortized Cost | $ 62 |  | $ 57 |  |  |
% of Total | 2.00% |  | 2.00% |  |  |

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