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CREDIT QUALITY AND THE ALLOWANCE FOR CREDIT LOSSES - Accruing and Nonaccruing Past Due Amounts (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | $ 143,188 | $ 145,959
Loans and leases, nonaccrual | 1,469 | 1,364
Loans and leases, nonaccrual with no related ACL | 418 | 453
Guaranteed residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 1,091 | 1,122
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 | 140,248 | 143,111
Current | Guaranteed residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 714 | 675
30-59 |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 915 | 818
30-59 | Guaranteed residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 116 | 128
60-89 |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 256 | 333
60-89 | Guaranteed residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 59 | 76
90+ |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 300 | 333
90+ | Guaranteed residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 202 | 243
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 72,823 | 74,445
Loans and leases, nonaccrual | 891 | 774
Loans and leases, nonaccrual with no related ACL | 79 | 101
Commercial | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 43,951 | 44,974
Loans and leases, nonaccrual | 294 | 297
Loans and leases, nonaccrual with no related ACL | 25 | 30
Commercial | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 28,872 | 29,471
Loans and leases, nonaccrual | 597 | 477
Loans and leases, nonaccrual with no related ACL | 54 | 71
Commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 71,468 | 73,336
Commercial | Current | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 43,530 | 44,591
Commercial | Current | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 27,938 | 28,745
Commercial | 30-59 |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 367 | 212
Commercial | 30-59 | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 76 | 62
Commercial | 30-59 | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 291 | 150
Commercial | 60-89 |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 35 | 77
Commercial | 60-89 | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 28 | 18
Commercial | 60-89 | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 7 | 59
Commercial | 90+ |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 62 | 46
Commercial | 90+ | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 23 | 6
Commercial | 90+ | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 39 | 40
Retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 70,365 | 71,514
Loans and leases, nonaccrual | 578 | 590
Loans and leases, nonaccrual with no related ACL | 339 | 352
Retail | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 31,512 | 31,332
Loans and leases, nonaccrual | 174 | 177
Loans and leases, nonaccrual with no related ACL | 136 | 144
Retail | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 15,113 | 15,040
Loans and leases, nonaccrual | 288 | 285
Loans and leases, nonaccrual with no related ACL | 192 | 198
Retail | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 7,277 | 8,258
Loans and leases, nonaccrual | 47 | 61
Loans and leases, nonaccrual with no related ACL | 6 | 7
Retail | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 11,646 | 11,834
Loans and leases, nonaccrual | 29 | 28
Loans and leases, nonaccrual with no related ACL | 4 | 3
Retail | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 4,817 | 5,050
Loans and leases, nonaccrual | 40 | 39
Loans and leases, nonaccrual with no related ACL | 1 | 0
Retail | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 68,780 | 69,775
Retail | Current | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 30,742 | 30,499
Retail | Current | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 14,720 | 14,640
Retail | Current | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 7,085 | 8,005
Retail | Current | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 11,556 | 11,732
Retail | Current | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 4,677 | 4,899
Retail | 30-59 |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 548 | 606
Retail | 30-59 | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 271 | 282
Retail | 30-59 | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 79 | 82
Retail | 30-59 | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 115 | 144
Retail | 30-59 | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 40 | 49
Retail | 30-59 | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 43 | 49
Retail | 60-89 |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 221 | 256
Retail | 60-89 | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 116 | 118
Retail | 60-89 | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 26 | 33
Retail | 60-89 | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 30 | 48
Retail | 60-89 | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 19 | 23
Retail | 60-89 | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 30 | 34
Retail | 90+ |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 238 | 287
Retail | 90+ | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 209 | 256
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 | $ 27 | $ 29

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