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Investments - Schedule of Residential Mortgage Loans with Credit Quality Indicators, Performing or Nonperforming (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Schedule of Investments [Line Items] |  |  |  |  |  |
Allowance for expected loan loss | $ (77) | $ (75) | $ (70) | $ (69) | $ (64) | $ (66)
Total CMLs, net of valuation allowance | 7,391 |  | 5,926 |  |  |
Residential Mortgage |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Amortized Cost | $ 4,165 |  | $ 3,274 |  |  |
% of Total | 100.00% |  | 100.00% |  |  |
Allowance for expected loan loss | $ (58) | $ (58) | $ (53) | $ (51) | $ (50) | $ (54)
Total CMLs, net of valuation allowance | 4,107 |  | 3,221 |  |  |
Performing | Residential Mortgage |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Amortized Cost | $ 4,093 |  | $ 3,188 |  |  |
% of Total | 98.00% |  | 97.00% |  |  |
Non-performing | Residential Mortgage |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Amortized Cost | $ 72 |  | $ 86 |  |  |
% of Total | 2.00% |  | 3.00% |  |  |

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