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Loans - Schedule of Forecasted Economic Scenarios (Detail)
Dec. 31, 2027
Mar. 31, 2027
Dec. 31, 2026
Sep. 30, 2026
Jun. 30, 2026
Dec. 31, 2025
Sep. 30, 2025
Wholesale              
Schedule Of Forecasted Economic Scenarios [Line Items]              
Threshold period past due             180 days
Forecast | United States              
Schedule Of Forecasted Economic Scenarios [Line Items]              
Maximum estimated unemployment rate     7.40%        
Maximum decline in gross domestic rate relative to expected rate       3.00%      
Maximum estimated unemployment rate, multi-scenario forecast     5.40%        
Maximum decline in gross domestic rate relative to expected rate, multi-scenario forecast   1.50%          
Forecast | United States | U.S. unemployment rate              
Schedule Of Forecasted Economic Scenarios [Line Items]              
Allowance for credit losses forecast model inputs     4.40%   4.60% 4.70%  
Forecast | United States | U.S. GDP rate              
Schedule Of Forecasted Economic Scenarios [Line Items]              
Allowance for credit losses forecast model inputs 1.80%   1.40%     1.70%