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Loans - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2025 | Dec. 31, 2024
Loans Receivable [Line Items] |  |  |  |
Percentage of loans that were rated pass/non-criticized |  |  | 95.00% | 93.00%
Increase (decrease) in allowance for credit loss | $ (11) | $ (221) |  |

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