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Loans and allowance for loan losses - Changes in Allowance for Credit Losses (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance $ 2,197 $ 2,204 $ 2,184 $ 2,129
Provision for credit losses 110 120 345 470
Charge-offs (190) (154) (506) (497)
Recoveries 44 34 138 102
Net charge-offs (146) (120) (368) (395)
Ending balance 2,161 2,204 2,161 2,204
Commercial and industrial        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 793 790 769 620
Provision for credit losses 82 52 173 365
Charge-offs (89) (64) (196) (220)
Recoveries 17 14 57 27
Net charge-offs (72) (50) (139) (193)
Ending balance 803 792 803 792
Commercial Real Estate        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 544 658 599 764
Provision for credit losses (47) 1 (60) (60)
Charge-offs (22) (24) (69) (92)
Recoveries 1 4 6 27
Net charge-offs (21) (20) (63) (65)
Ending balance 476 639 476 639
Residential Real Estate        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 110 110 108 116
Provision for credit losses (3) (5) (1) (11)
Charge-offs (1) (1) (4) (4)
Recoveries 1 1 4 4
Net charge-offs 0 0 0 0
Ending balance 107 105 107 105
Consumer        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 750 646 708 629
Provision for credit losses 78 72 233 176
Charge-offs (78) (65) (237) (181)
Recoveries 25 15 71 44
Net charge-offs (53) (50) (166) (137)
Ending balance 775 668 775 668
Reserve for Unfunded Credit Commitments        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 80 60 60 60
Provision for credit losses 15 0 35 0
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Net charge-offs 0 0 0 0
Ending balance $ 95 $ 60 $ 95 $ 60