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Investments - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Weighted Average Yield | 3.80% |  | 3.80% |  | 3.29%
Gross unrealized gain included in accumulated other comprehensive gain/(loss) |  |  | $ 499,000,000 |  | $ 0
Net unrealized losses included in other comprehensive income/(loss before tax | $ 248,000,000 | $ 674,000,000 | 1,180,000,000 | $ 1,030,000,000.00 |
Net unrealized losses included in other comprehensive income/(loss) after tax | 185,000,000 | 504,000,000 | 878,000,000 | 766,000,000 |
Debt securities, available-for-sale, realized gain | 0 | 0 | 0 | 0 |
Debt securities, available-for-sale, realized loss | $ 0 | $ 0 | $ 111,000,000 | $ 0 |

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