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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, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | $ 11,816 |  | $ 11,816 |  | $ 19,234
Year two |  | 16,463 |  | 16,463 |  | 15,083
Year three |  | 13,285 |  | 13,285 |  | 17,786
Year four |  | 16,150 |  | 16,150 |  | 11,704
Year five |  | 10,573 |  | 10,573 |  | 8,328
Prior |  | 32,922 |  | 32,922 |  | 28,783
Total | [1] | 136,116 |  | 136,116 |  | 135,581
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 11 |  | 12 |  |
Year two |  | 17 |  | 34 |  |
Year three |  | 21 |  | 43 |  |
Year four |  | 22 |  | 42 |  |
Year five |  | 8 |  | 20 |  |
Prior |  | 32 |  | 76 |  |
Total |  | 156 | $ 180 | 316 | $ 343 |
Commercial and industrial |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 4,769 |  | 4,769 |  | 9,221
Year two |  | 8,107 |  | 8,107 |  | 6,895
Year three |  | 5,743 |  | 5,743 |  | 6,345
Year four |  | 5,501 |  | 5,501 |  | 3,509
Year five |  | 2,927 |  | 2,927 |  | 1,668
Prior |  | 6,485 |  | 6,485 |  | 5,895
Revolving Loans |  | 27,975 |  | 27,975 |  | 27,815
Revolving Loans Converted to Term Loans |  | 153 |  | 153 |  | 133
Total |  | 61,660 |  | 61,660 |  | 61,481
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 4 |  | 4 |  |
Year two |  | 5 |  | 8 |  |
Year three |  | 11 |  | 19 |  |
Year four |  | 4 |  | 13 |  |
Year five |  | 2 |  | 4 |  |
Prior |  | 4 |  | 9 |  |
Revolving Loans |  | 27 |  | 50 |  |
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  |
Total |  | 57 |  | 107 |  |
Commercial and industrial | Pass |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 4,712 |  | 4,712 |  | 9,021
Year two |  | 7,842 |  | 7,842 |  | 6,454
Year three |  | 5,186 |  | 5,186 |  | 5,845
Year four |  | 5,022 |  | 5,022 |  | 3,258
Year five |  | 2,719 |  | 2,719 |  | 1,534
Prior |  | 5,746 |  | 5,746 |  | 5,147
Revolving Loans |  | 26,527 |  | 26,527 |  | 26,262
Revolving Loans Converted to Term Loans |  | 100 |  | 100 |  | 79
Total |  | 57,854 |  | 57,854 |  | 57,600
Commercial and industrial | Criticized accrual |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 56 |  | 56 |  | 189
Year two |  | 239 |  | 239 |  | 385
Year three |  | 473 |  | 473 |  | 402
Year four |  | 391 |  | 391 |  | 210
Year five |  | 170 |  | 170 |  | 75
Prior |  | 485 |  | 485 |  | 528
Revolving Loans |  | 1,169 |  | 1,169 |  | 1,359
Revolving Loans Converted to Term Loans |  | 36 |  | 36 |  | 37
Total |  | 3,019 |  | 3,019 |  | 3,185
Commercial and industrial | Criticized nonaccrual |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 1 |  | 1 |  | 11
Year two |  | 26 |  | 26 |  | 56
Year three |  | 84 |  | 84 |  | 98
Year four |  | 88 |  | 88 |  | 41
Year five |  | 38 |  | 38 |  | 59
Prior |  | 254 |  | 254 |  | 220
Revolving Loans |  | 279 |  | 279 |  | 194
Revolving Loans Converted to Term Loans |  | 17 |  | 17 |  | 17
Total |  | 787 |  | 787 |  | 696
Commercial Real Estate |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |  |  |  |
Total |  | 25 | $ 43 | 47 | $ 68 |
Commercial Real Estate | Commercial |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 1,382 |  | 1,382 |  | 714
Year two |  | 420 |  | 420 |  | 1,867
Year three |  | 1,929 |  | 1,929 |  | 2,076
Year four |  | 1,992 |  | 1,992 |  | 1,501
Year five |  | 1,475 |  | 1,475 |  | 2,382
Prior |  | 12,491 |  | 12,491 |  | 11,819
Revolving Loans |  | 466 |  | 466 |  | 421
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  | 0
Total |  | 20,155 |  | 20,155 |  | 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 |  | 4 |  | 4 |  |
Year five |  | 0 |  | 0 |  |
Prior |  | 18 |  | 40 |  |
Revolving Loans |  | 0 |  | 0 |  |
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  |
Total |  | 22 |  | 44 |  |
Commercial Real Estate | Commercial | Pass |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 1,382 |  | 1,382 |  | 674
Year two |  | 383 |  | 383 |  | 1,477
Year three |  | 1,543 |  | 1,543 |  | 1,358
Year four |  | 1,510 |  | 1,510 |  | 1,222
Year five |  | 1,234 |  | 1,234 |  | 1,774
Prior |  | 10,332 |  | 10,332 |  | 9,611
Revolving Loans |  | 460 |  | 460 |  | 413
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  | 0
Total |  | 16,844 |  | 16,844 |  | 16,529
Commercial Real Estate | Commercial | Criticized accrual |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 0 |  | 0 |  | 39
Year two |  | 37 |  | 37 |  | 389
Year three |  | 385 |  | 385 |  | 665
Year four |  | 433 |  | 433 |  | 253
Year five |  | 221 |  | 221 |  | 591
Prior |  | 1,853 |  | 1,853 |  | 1,839
Revolving Loans |  | 6 |  | 6 |  | 7
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  | 0
Total |  | 2,935 |  | 2,935 |  | 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 |  | 1 |  | 1 |  | 53
Year four |  | 49 |  | 49 |  | 26
Year five |  | 20 |  | 20 |  | 17
Prior |  | 306 |  | 306 |  | 369
Revolving Loans |  | 0 |  | 0 |  | 1
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  | 0
Total |  | 376 |  | 376 |  | 468
Commercial Real Estate | Residential builder and developer |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 26 |  | 26 |  | 396
Year two |  | 0 |  | 0 |  | 278
Year three |  | 6 |  | 6 |  | 74
Year four |  | 39 |  | 39 |  | 12
Year five |  | 2 |  | 2 |  | 4
Prior |  | 10 |  | 10 |  | 11
Revolving Loans |  | 68 |  | 68 |  | 60
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  | 0
Total |  | 151 |  | 151 |  | 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 |  | 26 |  | 26 |  | 380
Year two |  | 0 |  | 0 |  | 236
Year three |  | 6 |  | 6 |  | 40
Year four |  | 26 |  | 26 |  | 12
Year five |  | 2 |  | 2 |  | 4
Prior |  | 9 |  | 9 |  | 10
Revolving Loans |  | 68 |  | 68 |  | 60
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  | 0
Total |  | 137 |  | 137 |  | 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 |  | 13 |  | 13 |  | 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 |  | 13 |  | 13 |  | 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 |  | 1 |  | 1 |  | 1
Revolving Loans |  | 0 |  | 0 |  | 0
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  | 0
Total |  | 1 |  | 1 |  | 2
Commercial Real Estate | Other commercial construction |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 43 |  | 43 |  | 150
Year two |  | 189 |  | 189 |  | 1,499
Year three |  | 1,487 |  | 1,487 |  | 1,795
Year four |  | 1,493 |  | 1,493 |  | 648
Year five |  | 295 |  | 295 |  | 472
Prior |  | 698 |  | 698 |  | 540
Revolving Loans |  | 56 |  | 56 |  | 45
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  | 0
Total |  | 4,261 |  | 4,261 |  | 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 |  | 3 |  | 3 |  |
Year five |  | 0 |  | 0 |  |
Prior |  | 0 |  | 0 |  |
Revolving Loans |  | 0 |  | 0 |  |
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  |
Total |  | 3 |  | 3 |  |
Commercial Real Estate | Other commercial construction | Pass |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 43 |  | 43 |  | 108
Year two |  | 186 |  | 186 |  | 1,395
Year three |  | 1,379 |  | 1,379 |  | 1,091
Year four |  | 845 |  | 845 |  | 269
Year five |  | 149 |  | 149 |  | 175
Prior |  | 380 |  | 380 |  | 379
Revolving Loans |  | 50 |  | 50 |  | 42
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  | 0
Total |  | 3,032 |  | 3,032 |  | 3,459
Commercial Real Estate | Other commercial construction | Criticized accrual |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Year one |  | 0 |  | 0 |  | 42
Year two |  | 3 |  | 3 |  | 104
Year three |  | 108 |  | 108 |  | 687
Year four |  | 637 |  | 637 |  | 346
Year five |  | 144 |  | 144 |  | 297
Prior |  | 308 |  | 308 |  | 145
Revolving Loans |  | 6 |  | 6 |  | 3
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  | 0
Total |  | 1,206 |  | 1,206 |  | 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 |  | 11 |  | 11 |  | 33
Year five |  | 2 |  | 2 |  | 0
Prior |  | 10 |  | 10 |  | 16
Revolving Loans |  | 0 |  | 0 |  | 0
Revolving Loans Converted to Term Loans |  | 0 |  | 0 |  | 0
Total |  | $ 23 |  | $ 23 |  | $ 66
[1] | Loans of $2.5 billion and $1.5 billion at June 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 $2.1 billion at June 30, 2025 and $1.2 billion at December 31, 2024.

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