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CREDIT QUALITY AND THE ALLOWANCE FOR CREDIT LOSSES - Accruing and Nonaccruing Past Due Amounts (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | $ 137,635 | $ 139,203
Loans and leases, nonaccrual | 1,582 | 1,664
Loans and leases, nonaccrual with no related ACL | 398 | 398
Guaranteed residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 1,012 | 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 | 135,245 | 136,320
Current | Guaranteed residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 824 | 696
30-59 |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 502 | 769
30-59 | Guaranteed residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 32 | 119
60-89 |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 151 | 254
60-89 | Guaranteed residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 19 | 55
90+ |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 155 | 196
90+ | Guaranteed residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 137 | 172
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 70,508 | 69,776
Loans and leases, nonaccrual | 983 | 1,017
Loans and leases, nonaccrual with no related ACL | 64 | 63
Commercial | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 43,781 | 42,551
Loans and leases, nonaccrual | 283 | 241
Loans and leases, nonaccrual with no related ACL | 45 | 31
Commercial | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 26,727 | 27,225
Loans and leases, nonaccrual | 700 | 776
Loans and leases, nonaccrual with no related ACL | 19 | 32
Commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 69,307 | 68,459
Commercial | Current | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 43,420 | 42,247
Commercial | Current | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 25,887 | 26,212
Commercial | 30-59 |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 187 | 239
Commercial | 30-59 | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 56 | 35
Commercial | 30-59 | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 131 | 204
Commercial | 60-89 |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 18 | 47
Commercial | 60-89 | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 13 | 20
Commercial | 60-89 | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 5 | 27
Commercial | 90+ |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 13 | 14
Commercial | 90+ | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 9 | 8
Commercial | 90+ | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 4 | 6
Retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 67,127 | 69,427
Loans and leases, nonaccrual | 599 | 647
Loans and leases, nonaccrual with no related ACL | 334 | 335
Retail | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 33,114 | 32,726
Loans and leases, nonaccrual | 198 | 192
Loans and leases, nonaccrual with no related ACL | 147 | 142
Retail | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 16,853 | 16,495
Loans and leases, nonaccrual | 282 | 283
Loans and leases, nonaccrual with no related ACL | 178 | 182
Retail | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 4,044 | 4,744
Loans and leases, nonaccrual | 39 | 48
Loans and leases, nonaccrual with no related ACL | 6 | 6
Retail | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 8,779 | 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 | 4,337 | 4,650
Loans and leases, nonaccrual | 60 | 68
Loans and leases, nonaccrual with no related ACL | 1 | 1
Retail | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 65,938 | 67,861
Retail | Current | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 32,682 | 32,011
Retail | Current | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 16,450 | 16,097
Retail | Current | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 3,900 | 4,563
Retail | Current | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 8,699 | 10,686
Retail | Current | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 4,207 | 4,504
Retail | 30-59 |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 315 | 530
Retail | 30-59 | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 60 | 251
Retail | 30-59 | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 94 | 88
Retail | 30-59 | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 80 | 100
Retail | 30-59 | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 39 | 45
Retail | 30-59 | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 42 | 46
Retail | 60-89 |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 133 | 207
Retail | 60-89 | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 36 | 93
Retail | 60-89 | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 27 | 27
Retail | 60-89 | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 25 | 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 | 27 | 31
Retail | 90+ |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 142 | 182
Retail | 90+ | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 138 | 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 | 3 | 2
Retail | 90+ | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | $ 1 | $ 1

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