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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 | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | $ 18,344 |  | $ 18,344 |  | $ 19,234
Year two |  | 15,460 |  | 15,460 |  | 15,083
Year three |  | 12,360 |  | 12,360 |  | 17,786
Year four |  | 15,149 |  | 15,149 |  | 11,704
Year five |  | 9,759 |  | 9,759 |  | 8,328
Prior |  | 30,693 |  | 30,693 |  | 28,783
Total | [1] | 136,974 |  | 136,974 |  | 135,581
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 13 |  | 25 |  |
Year two |  | 36 |  | 70 |  |
Year three |  | 24 |  | 67 |  |
Year four |  | 30 |  | 72 |  |
Year five |  | 8 |  | 28 |  |
Prior |  | 20 |  | 96 |  |
Total |  | 190 | $ 154 | 506 | $ 497 |
Commercial and industrial |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 7,099 |  | 7,099 |  | 9,221
Year two |  | 7,551 |  | 7,551 |  | 6,895
Year three |  | 5,208 |  | 5,208 |  | 6,345
Year four |  | 5,042 |  | 5,042 |  | 3,509
Year five |  | 2,598 |  | 2,598 |  | 1,668
Prior |  | 6,015 |  | 6,015 |  | 5,895
Revolving Loans |  | 28,222 |  | 28,222 |  | 27,815
Revolving Loans Converted to Term Loans |  | 152 |  | 152 |  | 133
Total |  | 61,887 |  | 61,887 |  | 61,481
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 3 |  | 7 |  |
Year two |  | 21 |  | 29 |  |
Year three |  | 12 |  | 31 |  |
Year four |  | 6 |  | 19 |  |
Year five |  | 2 |  | 6 |  |
Prior |  | 3 |  | 12 |  |
Revolving Loans |  | 42 |  | 92 |  |
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  |
Total |  | 89 |  | 196 |  |
Commercial and industrial | Pass |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 6,980 |  | 6,980 |  | 9,021
Year two |  | 7,252 |  | 7,252 |  | 6,454
Year three |  | 4,626 |  | 4,626 |  | 5,845
Year four |  | 4,526 |  | 4,526 |  | 3,258
Year five |  | 2,445 |  | 2,445 |  | 1,534
Prior |  | 5,346 |  | 5,346 |  | 5,147
Revolving Loans |  | 26,722 |  | 26,722 |  | 26,262
Revolving Loans Converted to Term Loans |  | 97 |  | 97 |  | 79
Total |  | 57,994 |  | 57,994 |  | 57,600
Commercial and industrial | Criticized accrual |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 115 |  | 115 |  | 189
Year two |  | 272 |  | 272 |  | 385
Year three |  | 492 |  | 492 |  | 402
Year four |  | 440 |  | 440 |  | 210
Year five |  | 120 |  | 120 |  | 75
Prior |  | 427 |  | 427 |  | 528
Revolving Loans |  | 1,232 |  | 1,232 |  | 1,359
Revolving Loans Converted to Term Loans |  | 35 |  | 35 |  | 37
Total |  | 3,133 |  | 3,133 |  | 3,185
Commercial and industrial | Criticized nonaccrual |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 4 |  | 4 |  | 11
Year two |  | 27 |  | 27 |  | 56
Year three |  | 90 |  | 90 |  | 98
Year four |  | 76 |  | 76 |  | 41
Year five |  | 33 |  | 33 |  | 59
Prior |  | 242 |  | 242 |  | 220
Revolving Loans |  | 268 |  | 268 |  | 194
Revolving Loans Converted to Term Loans |  | 20 |  | 20 |  | 17
Total |  | 760 |  | 760 |  | 696
Commercial Real Estate |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |  |  |  |
Total |  | 22 | $ 24 | 69 | $ 92 |
Commercial Real Estate | Commercial |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 2,675 |  | 2,675 |  | 714
Year two |  | 437 |  | 437 |  | 1,867
Year three |  | 1,852 |  | 1,852 |  | 2,076
Year four |  | 1,983 |  | 1,983 |  | 1,501
Year five |  | 1,338 |  | 1,338 |  | 2,382
Prior |  | 11,378 |  | 11,378 |  | 11,819
Revolving Loans |  | 399 |  | 399 |  | 421
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  | 0
Total |  | 20,062 |  | 20,062 |  | 20,780
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 0 |  | 0 |  |
Year two |  | 0 |  | 0 |  |
Year three |  | 0 |  | 0 |  |
Year four |  | 11 |  | 15 |  |
Year five |  | 0 |  | 0 |  |
Prior |  | 7 |  | 47 |  |
Revolving Loans |  | 0 |  | 0 |  |
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  |
Total |  | 18 |  | 62 |  |
Commercial Real Estate | Commercial | Pass |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 2,675 |  | 2,675 |  | 674
Year two |  | 408 |  | 408 |  | 1,477
Year three |  | 1,548 |  | 1,548 |  | 1,358
Year four |  | 1,610 |  | 1,610 |  | 1,222
Year five |  | 1,205 |  | 1,205 |  | 1,774
Prior |  | 9,538 |  | 9,538 |  | 9,611
Revolving Loans |  | 393 |  | 393 |  | 413
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  | 0
Total |  | 17,377 |  | 17,377 |  | 16,529
Commercial Real Estate | Commercial | Criticized accrual |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 0 |  | 0 |  | 39
Year two |  | 29 |  | 29 |  | 389
Year three |  | 297 |  | 297 |  | 665
Year four |  | 337 |  | 337 |  | 253
Year five |  | 83 |  | 83 |  | 591
Prior |  | 1,572 |  | 1,572 |  | 1,839
Revolving Loans |  | 6 |  | 6 |  | 7
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  | 0
Total |  | 2,324 |  | 2,324 |  | 3,783
Commercial Real Estate | Commercial | Criticized nonaccrual |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 0 |  | 0 |  | 1
Year two |  | 0 |  | 0 |  | 1
Year three |  | 7 |  | 7 |  | 53
Year four |  | 36 |  | 36 |  | 26
Year five |  | 50 |  | 50 |  | 17
Prior |  | 268 |  | 268 |  | 369
Revolving Loans |  | 0 |  | 0 |  | 1
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  | 0
Total |  | 361 |  | 361 |  | 468
Commercial Real Estate | Residential builder and developer |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 3 |  | 3 |  | 396
Year two |  | 0 |  | 0 |  | 278
Year three |  | 3 |  | 3 |  | 74
Year four |  | 30 |  | 30 |  | 12
Year five |  | 0 |  | 0 |  | 4
Prior |  | 5 |  | 5 |  | 11
Revolving Loans |  | 51 |  | 51 |  | 60
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  | 0
Total |  | 92 |  | 92 |  | 835
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 0 |  | 0 |  |
Year two |  | 0 |  | 0 |  |
Year three |  | 0 |  | 0 |  |
Year four |  | 0 |  | 0 |  |
Year five |  | 0 |  | 0 |  |
Prior |  | 0 |  | 0 |  |
Revolving Loans |  | 0 |  | 0 |  |
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  |
Total |  | 0 |  | 0 |  |
Commercial Real Estate | Residential builder and developer | Pass |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 3 |  | 3 |  | 380
Year two |  | 0 |  | 0 |  | 236
Year three |  | 3 |  | 3 |  | 40
Year four |  | 9 |  | 9 |  | 12
Year five |  | 0 |  | 0 |  | 4
Prior |  | 5 |  | 5 |  | 10
Revolving Loans |  | 51 |  | 51 |  | 60
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  | 0
Total |  | 71 |  | 71 |  | 742
Commercial Real Estate | Residential builder and developer | Criticized accrual |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 0 |  | 0 |  | 15
Year two |  | 0 |  | 0 |  | 42
Year three |  | 0 |  | 0 |  | 34
Year four |  | 21 |  | 21 |  | 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 |  | 21 |  | 21 |  | 91
Commercial Real Estate | Residential builder and developer | Criticized nonaccrual |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 0 |  | 0 |  | 1
Year two |  | 0 |  | 0 |  | 0
Year three |  | 0 |  | 0 |  | 0
Year four |  | 0 |  | 0 |  | 0
Year five |  | 0 |  | 0 |  | 0
Prior |  | 0 |  | 0 |  | 1
Revolving Loans |  | 0 |  | 0 |  | 0
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  | 0
Total |  | 0 |  | 0 |  | 2
Commercial Real Estate | Other commercial construction |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 138 |  | 138 |  | 150
Year two |  | 211 |  | 211 |  | 1,499
Year three |  | 1,418 |  | 1,418 |  | 1,795
Year four |  | 1,291 |  | 1,291 |  | 648
Year five |  | 225 |  | 225 |  | 472
Prior |  | 565 |  | 565 |  | 540
Revolving Loans |  | 44 |  | 44 |  | 45
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  | 0
Total |  | 3,892 |  | 3,892 |  | 5,149
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 0 |  | 0 |  |
Year two |  | 0 |  | 0 |  |
Year three |  | 0 |  | 0 |  |
Year four |  | 4 |  | 7 |  |
Year five |  | 0 |  | 0 |  |
Prior |  | 0 |  | 0 |  |
Revolving Loans |  | 0 |  | 0 |  |
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  |
Total |  | 4 |  | 7 |  |
Commercial Real Estate | Other commercial construction | Pass |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 138 |  | 138 |  | 108
Year two |  | 205 |  | 205 |  | 1,395
Year three |  | 1,265 |  | 1,265 |  | 1,091
Year four |  | 652 |  | 652 |  | 269
Year five |  | 78 |  | 78 |  | 175
Prior |  | 339 |  | 339 |  | 379
Revolving Loans |  | 38 |  | 38 |  | 42
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  | 0
Total |  | 2,715 |  | 2,715 |  | 3,459
Commercial Real Estate | Other commercial construction | Criticized accrual |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 0 |  | 0 |  | 42
Year two |  | 6 |  | 6 |  | 104
Year three |  | 153 |  | 153 |  | 687
Year four |  | 629 |  | 629 |  | 346
Year five |  | 143 |  | 143 |  | 297
Prior |  | 219 |  | 219 |  | 145
Revolving Loans |  | 6 |  | 6 |  | 3
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  | 0
Total |  | 1,156 |  | 1,156 |  | 1,624
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 |  | 17
Year four |  | 10 |  | 10 |  | 33
Year five |  | 4 |  | 4 |  | 0
Prior |  | 7 |  | 7 |  | 16
Revolving Loans |  | 0 |  | 0 |  | 0
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  | 0
Total |  | $ 21 |  | $ 21 |  | $ 66
[1] | Loans of $2.3 billion and $1.5 billion at September 30, 2025 and December 31, 2024, 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 $1.9 billion at September 30, 2025 and $1.2 billion at December 31, 2024.

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