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CREDIT QUALITY AND THE ALLOWANCE FOR CREDIT LOSSES - Accruing and Non-accruing Past Due Amounts (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | $ 139,203 | $ 145,959
Loans and leases, nonaccrual | 1,664 | 1,364
Loans and leases, nonaccrual with no related ACL | 398 | 453
FHA, VA And USDA Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 1,042 | 1,122
Loans and leases, nonaccrual | 0 | 0
Loans and leases, nonaccrual with no related ACL | 0 | 0
Financing Receivables, Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 136,320 | 143,111
Financing Receivables, Current | FHA, VA And USDA Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 696 | 675
Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 769 | 818
Financing Receivables, 30 to 59 Days Past Due | FHA, VA And USDA Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 119 | 128
Financing Receivables, 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 254 | 333
Financing Receivables, 60 to 89 Days Past Due | FHA, VA And USDA Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 55 | 76
Financing Receivables, 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 196 | 333
Financing Receivables, 90 Days or More Past Due | FHA, VA And USDA Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 172 | 243
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 69,776 | 74,445
Loans and leases, nonaccrual | 1,017 | 774
Loans and leases, nonaccrual with no related ACL | 63 | 101
Commercial | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 42,551 | 44,974
Loans and leases, nonaccrual | 241 | 297
Loans and leases, nonaccrual with no related ACL | 31 | 30
Commercial | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 27,225 | 29,471
Loans and leases, nonaccrual | 776 | 477
Loans and leases, nonaccrual with no related ACL | 32 | 71
Commercial | Financing Receivables, Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 68,459 | 73,336
Commercial | Financing Receivables, Current | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 42,247 | 44,591
Commercial | Financing Receivables, Current | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 26,212 | 28,745
Commercial | Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 239 | 212
Commercial | Financing Receivables, 30 to 59 Days Past Due | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 35 | 62
Commercial | Financing Receivables, 30 to 59 Days Past Due | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 204 | 150
Commercial | Financing Receivables, 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 47 | 77
Commercial | Financing Receivables, 60 to 89 Days Past Due | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 20 | 18
Commercial | Financing Receivables, 60 to 89 Days Past Due | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 27 | 59
Commercial | Financing Receivables, 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 14 | 46
Commercial | Financing Receivables, 90 Days or More Past Due | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 8 | 6
Commercial | Financing Receivables, 90 Days or More Past Due | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 6 | 40
Retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 69,427 | 71,514
Loans and leases, nonaccrual | 647 | 590
Loans and leases, nonaccrual with no related ACL | 335 | 352
Retail | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 32,726 | 31,332
Loans and leases, nonaccrual | 192 | 177
Loans and leases, nonaccrual with no related ACL | 142 | 144
Retail | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 16,495 | 15,040
Loans and leases, nonaccrual | 283 | 285
Loans and leases, nonaccrual with no related ACL | 182 | 198
Retail | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 4,744 | 8,258
Loans and leases, nonaccrual | 48 | 61
Loans and leases, nonaccrual with no related ACL | 6 | 7
Retail | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 10,812 | 11,834
Loans and leases, nonaccrual | 56 | 28
Loans and leases, nonaccrual with no related ACL | 4 | 3
Retail | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 4,650 | 5,050
Loans and leases, nonaccrual | 68 | 39
Loans and leases, nonaccrual with no related ACL | 1 | 0
Retail | Financing Receivables, Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 67,861 | 69,775
Retail | Financing Receivables, Current | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 32,011 | 30,499
Retail | Financing Receivables, Current | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 16,097 | 14,640
Retail | Financing Receivables, Current | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 4,563 | 8,005
Retail | Financing Receivables, Current | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 10,686 | 11,732
Retail | Financing Receivables, Current | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 4,504 | 4,899
Retail | Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 530 | 606
Retail | Financing Receivables, 30 to 59 Days Past Due | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 251 | 282
Retail | Financing Receivables, 30 to 59 Days Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 88 | 82
Retail | Financing Receivables, 30 to 59 Days Past Due | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 100 | 144
Retail | Financing Receivables, 30 to 59 Days Past Due | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 45 | 49
Retail | Financing Receivables, 30 to 59 Days Past Due | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 46 | 49
Retail | Financing Receivables, 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 207 | 256
Retail | Financing Receivables, 60 to 89 Days Past Due | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 93 | 118
Retail | Financing Receivables, 60 to 89 Days Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 27 | 33
Retail | Financing Receivables, 60 to 89 Days Past Due | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 33 | 48
Retail | Financing Receivables, 60 to 89 Days Past Due | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 23 | 23
Retail | Financing Receivables, 60 to 89 Days Past Due | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 31 | 34
Retail | Financing Receivables, 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 182 | 287
Retail | Financing Receivables, 90 Days or More Past Due | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 179 | 256
Retail | Financing Receivables, 90 Days or More Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 0 | 0
Retail | Financing Receivables, 90 Days or More Past Due | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 0 | 0
Retail | Financing Receivables, 90 Days or More Past Due | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 2 | 2
Retail | Financing Receivables, 90 Days or More Past Due | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | $ 1 | $ 29

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