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CREDIT QUALITY AND THE ALLOWANCE FOR CREDIT LOSSES - Accruing and Nonaccruing Past Due Amounts (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | $ 140,870 | $ 139,203
Loans and leases, nonaccrual | 1,518 | 1,664
Loans and leases, nonaccrual with no related ACL | 412 | 398
Guaranteed residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 976 | 1,042
Loans and leases, nonaccrual | 0 | 0
Loans and leases, nonaccrual with no related ACL | 0 | 0
Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 138,545 | 136,320
Current | Guaranteed residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 795 | 696
30-59 |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 433 | 769
30-59 | Guaranteed residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 44 | 119
60-89 |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 212 | 254
60-89 | Guaranteed residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 23 | 55
90+ |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 162 | 196
90+ | Guaranteed residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 114 | 172
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 72,493 | 69,776
Loans and leases, nonaccrual | 933 | 1,017
Loans and leases, nonaccrual with no related ACL | 49 | 63
Commercial | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 46,953 | 42,551
Loans and leases, nonaccrual | 230 | 241
Loans and leases, nonaccrual with no related ACL | 24 | 31
Commercial | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 25,540 | 27,225
Loans and leases, nonaccrual | 703 | 776
Loans and leases, nonaccrual with no related ACL | 25 | 32
Commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 71,292 | 68,459
Commercial | Current | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 46,624 | 42,247
Commercial | Current | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 24,668 | 26,212
Commercial | 30-59 |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 142 | 239
Commercial | 30-59 | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 52 | 35
Commercial | 30-59 | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 90 | 204
Commercial | 60-89 |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 80 | 47
Commercial | 60-89 | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 8 | 20
Commercial | 60-89 | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 72 | 27
Commercial | 90+ |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 46 | 14
Commercial | 90+ | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 39 | 8
Commercial | 90+ | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 7 | 6
Retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 68,377 | 69,427
Loans and leases, nonaccrual | 585 | 647
Loans and leases, nonaccrual with no related ACL | 363 | 335
Retail | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 34,477 | 32,726
Loans and leases, nonaccrual | 188 | 192
Loans and leases, nonaccrual with no related ACL | 150 | 142
Retail | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 18,415 | 16,495
Loans and leases, nonaccrual | 297 | 283
Loans and leases, nonaccrual with no related ACL | 206 | 182
Retail | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 2,816 | 4,744
Loans and leases, nonaccrual | 31 | 48
Loans and leases, nonaccrual with no related ACL | 4 | 6
Retail | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 8,556 | 10,812
Loans and leases, nonaccrual | 20 | 56
Loans and leases, nonaccrual with no related ACL | 2 | 4
Retail | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 4,113 | 4,650
Loans and leases, nonaccrual | 49 | 68
Loans and leases, nonaccrual with no related ACL | 1 | 1
Retail | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 67,253 | 67,861
Retail | Current | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 34,052 | 32,011
Retail | Current | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 18,007 | 16,097
Retail | Current | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 2,702 | 4,563
Retail | Current | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 8,482 | 10,686
Retail | Current | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 4,010 | 4,504
Retail | 30-59 |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 291 | 530
Retail | 30-59 | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 80 | 251
Retail | 30-59 | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 83 | 88
Retail | 30-59 | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 62 | 100
Retail | 30-59 | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 34 | 45
Retail | 30-59 | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 32 | 46
Retail | 60-89 |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 132 | 207
Retail | 60-89 | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 43 | 93
Retail | 60-89 | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 28 | 27
Retail | 60-89 | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 21 | 33
Retail | 60-89 | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 18 | 23
Retail | 60-89 | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 22 | 31
Retail | 90+ |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 116 | 182
Retail | 90+ | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 114 | 179
Retail | 90+ | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 0 | 0
Retail | 90+ | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 0 | 0
Retail | 90+ | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 2 | 2
Retail | 90+ | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | $ 0 | $ 1

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