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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)