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Loans and allowance for loan losses - Summary of Loan grades applied various classes of Commercial and Real Estate Loans (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025 | Dec. 31, 2025
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | $ 15,481 |  | $ 15,481 |  | $ 23,922
Year two |  | 21,126 |  | 21,126 |  | 14,450
Year three |  | 12,538 |  | 12,538 |  | 11,389
Year four |  | 9,860 |  | 9,860 |  | 14,171
Year five |  | 12,420 |  | 12,420 |  | 9,181
Prior |  | 33,998 |  | 33,998 |  | 28,808
Total | [1] | 143,193 |  | 143,193 |  | 138,702
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  |  |  | 5 |  |
Year two |  |  |  | 35 |  |
Year three |  |  |  | 50 |  |
Year four |  |  |  | 41 |  |
Year five |  |  |  | 26 |  |
Prior |  |  |  | 64 |  |
Total |  | 138 | $ 156 | 291 | $ 316 |
Commercial and industrial |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 6,839 |  | 6,839 |  | 9,686
Year two |  | 8,672 |  | 8,672 |  | 7,026
Year three |  | 5,978 |  | 5,978 |  | 4,626
Year four |  | 3,784 |  | 3,784 |  | 4,541
Year five |  | 3,626 |  | 3,626 |  | 2,344
Prior |  | 6,684 |  | 6,684 |  | 5,562
Revolving Loans |  | 30,415 |  | 30,415 |  | 29,615
Revolving Loans Converted to Term Loans |  | 145 |  | 145 |  | 148
Total |  | 66,143 |  | 66,143 |  | 63,548
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  |  |  | 0 |  |
Year two |  |  |  | 10 |  |
Year three |  |  |  | 18 |  |
Year four |  |  |  | 9 |  |
Year five |  |  |  | 8 |  |
Prior |  |  |  | 8 |  |
Revolving Loans |  |  |  | 32 |  |
Revolving Loans Converted to Term Loans |  |  |  | 0 |  |
Total |  |  |  | 85 |  |
Commercial and industrial | Pass |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 6,787 |  | 6,787 |  | 9,462
Year two |  | 8,417 |  | 8,417 |  | 6,640
Year three |  | 5,539 |  | 5,539 |  | 4,075
Year four |  | 3,315 |  | 3,315 |  | 4,086
Year five |  | 3,285 |  | 3,285 |  | 2,203
Prior |  | 6,176 |  | 6,176 |  | 5,059
Revolving Loans |  | 29,143 |  | 29,143 |  | 28,124
Revolving Loans Converted to Term Loans |  | 93 |  | 93 |  | 95
Total |  | 62,755 |  | 62,755 |  | 59,744
Commercial and industrial | Criticized accrual |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 49 |  | 49 |  | 216
Year two |  | 222 |  | 222 |  | 337
Year three |  | 370 |  | 370 |  | 479
Year four |  | 405 |  | 405 |  | 390
Year five |  | 266 |  | 266 |  | 116
Prior |  | 349 |  | 349 |  | 348
Revolving Loans |  | 1,125 |  | 1,125 |  | 1,355
Revolving Loans Converted to Term Loans |  | 32 |  | 32 |  | 36
Total |  | 2,818 |  | 2,818 |  | 3,277
Commercial and industrial | Criticized nonaccrual |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 3 |  | 3 |  | 8
Year two |  | 33 |  | 33 |  | 49
Year three |  | 69 |  | 69 |  | 72
Year four |  | 64 |  | 64 |  | 65
Year five |  | 75 |  | 75 |  | 25
Prior |  | 159 |  | 159 |  | 155
Revolving Loans |  | 147 |  | 147 |  | 136
Revolving Loans Converted to Term Loans |  | 20 |  | 20 |  | 17
Total |  | 570 |  | 570 |  | 527
Commercial real estate |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |  |  |  |
Total |  | 15 | $ 25 | 33 | $ 47 |
Commercial real estate | Commercial |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 2,888 |  | 2,888 |  | 3,781
Year two |  | 3,302 |  | 3,302 |  | 429
Year three |  | 422 |  | 422 |  | 1,822
Year four |  | 1,833 |  | 1,833 |  | 1,950
Year five |  | 1,936 |  | 1,936 |  | 1,250
Prior |  | 10,465 |  | 10,465 |  | 10,592
Revolving Loans |  | 388 |  | 388 |  | 368
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  | 0
Total |  | 21,234 |  | 21,234 |  | 20,192
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  |  |  | 0 |  |
Year two |  |  |  | 0 |  |
Year three |  |  |  | 0 |  |
Year four |  |  |  | 9 |  |
Year five |  |  |  | 2 |  |
Prior |  |  |  | 21 |  |
Revolving Loans |  |  |  | 0 |  |
Revolving Loans Converted to Term Loans |  |  |  | 0 |  |
Total |  |  |  | 32 |  |
Commercial real estate | Commercial | Pass |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 2,888 |  | 2,888 |  | 3,757
Year two |  | 3,290 |  | 3,290 |  | 400
Year three |  | 413 |  | 413 |  | 1,535
Year four |  | 1,655 |  | 1,655 |  | 1,681
Year five |  | 1,782 |  | 1,782 |  | 1,121
Prior |  | 9,032 |  | 9,032 |  | 8,970
Revolving Loans |  | 388 |  | 388 |  | 367
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  | 0
Total |  | 19,448 |  | 19,448 |  | 17,831
Commercial real estate | Commercial | Criticized accrual |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 0 |  | 0 |  | 0
Year two |  | 12 |  | 12 |  | 29
Year three |  | 9 |  | 9 |  | 283
Year four |  | 155 |  | 155 |  | 244
Year five |  | 131 |  | 131 |  | 80
Prior |  | 1,263 |  | 1,263 |  | 1,404
Revolving Loans |  | 0 |  | 0 |  | 1
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  | 0
Total |  | 1,570 |  | 1,570 |  | 2,041
Commercial real estate | Commercial | Criticized nonaccrual |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 0 |  | 0 |  | 24
Year two |  | 0 |  | 0 |  | 0
Year three |  | 0 |  | 0 |  | 4
Year four |  | 23 |  | 23 |  | 25
Year five |  | 23 |  | 23 |  | 49
Prior |  | 170 |  | 170 |  | 218
Revolving Loans |  | 0 |  | 0 |  | 0
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  | 0
Total |  | 216 |  | 216 |  | 320
Commercial real estate | Residential builder and developer |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 47 |  | 47 |  | 9
Year two |  | 18 |  | 18 |  | 1
Year three |  | 2 |  | 2 |  | 2
Year four |  | 0 |  | 0 |  | 14
Year five |  | 11 |  | 11 |  | 0
Prior |  | 4 |  | 4 |  | 5
Revolving Loans |  | 28 |  | 28 |  | 38
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  | 0
Total |  | 110 |  | 110 |  | 69
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  |  |  | 0 |  |
Year two |  |  |  | 0 |  |
Year three |  |  |  | 0 |  |
Year four |  |  |  | 0 |  |
Year five |  |  |  | 0 |  |
Prior |  |  |  | 0 |  |
Revolving Loans |  |  |  | 0 |  |
Revolving Loans Converted to Term Loans |  |  |  | 0 |  |
Total |  |  |  | 0 |  |
Commercial real estate | Residential builder and developer | Pass |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 47 |  | 47 |  | 9
Year two |  | 18 |  | 18 |  | 1
Year three |  | 2 |  | 2 |  | 2
Year four |  | 0 |  | 0 |  | 2
Year five |  | 0 |  | 0 |  | 0
Prior |  | 4 |  | 4 |  | 5
Revolving Loans |  | 28 |  | 28 |  | 38
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  | 0
Total |  | 99 |  | 99 |  | 57
Commercial real estate | Residential builder and developer | Criticized accrual |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 0 |  | 0 |  | 0
Year two |  | 0 |  | 0 |  | 0
Year three |  | 0 |  | 0 |  | 0
Year four |  | 0 |  | 0 |  | 12
Year five |  | 11 |  | 11 |  | 0
Prior |  | 0 |  | 0 |  | 0
Revolving Loans |  | 0 |  | 0 |  | 0
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  | 0
Total |  | 11 |  | 11 |  | 12
Commercial real estate | Residential builder and developer | Criticized nonaccrual |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 0 |  | 0 |  | 0
Year two |  | 0 |  | 0 |  | 0
Year three |  | 0 |  | 0 |  | 0
Year four |  | 0 |  | 0 |  | 0
Year five |  | 0 |  | 0 |  | 0
Prior |  | 0 |  | 0 |  | 0
Revolving Loans |  | 0 |  | 0 |  | 0
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  | 0
Total |  | 0 |  | 0 |  | 0
Commercial real estate | Other commercial construction |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 215 |  | 215 |  | 313
Year two |  | 548 |  | 548 |  | 229
Year three |  | 250 |  | 250 |  | 1,282
Year four |  | 1,034 |  | 1,034 |  | 1,107
Year five |  | 672 |  | 672 |  | 200
Prior |  | 354 |  | 354 |  | 376
Revolving Loans |  | 75 |  | 75 |  | 51
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  | 0
Total |  | 3,148 |  | 3,148 |  | 3,558
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  |  |  | 0 |  |
Year two |  |  |  | 0 |  |
Year three |  |  |  | 0 |  |
Year four |  |  |  | 0 |  |
Year five |  |  |  | 0 |  |
Prior |  |  |  | 1 |  |
Revolving Loans |  |  |  | 0 |  |
Revolving Loans Converted to Term Loans |  |  |  | 0 |  |
Total |  |  |  | 1 |  |
Commercial real estate | Other commercial construction | Pass |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 215 |  | 215 |  | 313
Year two |  | 548 |  | 548 |  | 221
Year three |  | 240 |  | 240 |  | 1,031
Year four |  | 922 |  | 922 |  | 606
Year five |  | 316 |  | 316 |  | 63
Prior |  | 166 |  | 166 |  | 198
Revolving Loans |  | 74 |  | 74 |  | 45
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  | 0
Total |  | 2,481 |  | 2,481 |  | 2,477
Commercial real estate | Other commercial construction | Criticized accrual |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 0 |  | 0 |  | 0
Year two |  | 0 |  | 0 |  | 8
Year three |  | 10 |  | 10 |  | 251
Year four |  | 112 |  | 112 |  | 493
Year five |  | 349 |  | 349 |  | 136
Prior |  | 159 |  | 159 |  | 174
Revolving Loans |  | 1 |  | 1 |  | 6
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  | 0
Total |  | 631 |  | 631 |  | 1,068
Commercial real estate | Other commercial construction | Criticized nonaccrual |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 0 |  | 0 |  | 0
Year two |  | 0 |  | 0 |  | 0
Year three |  | 0 |  | 0 |  | 0
Year four |  | 0 |  | 0 |  | 8
Year five |  | 7 |  | 7 |  | 1
Prior |  | 29 |  | 29 |  | 4
Revolving Loans |  | 0 |  | 0 |  | 0
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  | 0
Total |  | $ 36 |  | $ 36 |  | $ 13
[1] | Loans of $3.1 billion and $2.1 billion at June 30, 2026 and December 31, 2025, respectively, were held in special purpose trusts to settle the respective obligations of asset-backed notes issued by those trusts. The outstanding balances of those asset-backed notes issued to third party investors were included in Long-term borrowings and were $2.8 billion at June 30, 2026 and $1.7 billion at December 31, 2025.

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