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Loans and allowance for loan losses - Additional Information (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Loans And Leases Receivable [Line Items]    
Amount of foreclosed residential real estate property held $ 37 $ 35
Loans secured by residential real estate that were in the process of foreclosure $ 180 173
Percentage loans in the process of foreclosure, serviced by other entities, classified as government guaranteed 46.00%  
Financing receivable, accrued interest, before allowance for credit loss $ 619 628
Commercial and industrial | Asset Pledged as Collateral without Right    
Loans And Leases Receivable [Line Items]    
Financing receivable, before allowance for credit loss 21,100  
Commercial and industrial | Asset Pledged as Collateral without Right | FHLBs Facility    
Loans And Leases Receivable [Line Items]    
Pledged financial instruments   20,700
Commercial Real Estate | Asset Pledged as Collateral without Right    
Loans And Leases Receivable [Line Items]    
Financing receivable, before allowance for credit loss 13,400  
Commercial Real Estate | Asset Pledged as Collateral without Right | FHLBs Facility    
Loans And Leases Receivable [Line Items]    
Pledged financial instruments   14,600
Residential Real Estate | Asset Pledged as Collateral without Right    
Loans And Leases Receivable [Line Items]    
Financing receivable, before allowance for credit loss 19,300  
Residential Real Estate | Asset Pledged as Collateral without Right | FHLBs Facility    
Loans And Leases Receivable [Line Items]    
Pledged financial instruments   18,600
Home equity lines and loans | Consumer | Asset Pledged as Collateral without Right    
Loans And Leases Receivable [Line Items]    
Financing receivable, before allowance for credit loss 2,900  
Home equity lines and loans | Consumer | Asset Pledged as Collateral without Right | FHLBs Facility    
Loans And Leases Receivable [Line Items]    
Pledged financial instruments   2,700
Other | Consumer | Asset Pledged as Collateral without Right    
Loans And Leases Receivable [Line Items]    
Financing receivable, before allowance for credit loss $ 13,700  
Other | Consumer | Asset Pledged as Collateral without Right | FHLBs Facility    
Loans And Leases Receivable [Line Items]    
Pledged financial instruments   $ 13,100