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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, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | $ 145,959 | $ 156,662
Loans and leases, nonaccrual | 1,364 | 944
Loans and leases, nonaccrual with no related ACL | 453 | 456
FHA, VA And USDA Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 1,122 | 1,196
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 | 143,111 | 154,527
Financing Receivables, Current | FHA, VA And USDA Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 675 | 789
Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 818 | 598
Financing Receivables, 30 to 59 Days Past Due | FHA, VA And USDA Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 128 | 57
Financing Receivables, 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 333 | 226
Financing Receivables, 60 to 89 Days Past Due | FHA, VA And USDA Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 76 | 34
Financing Receivables, 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 333 | 367
Financing Receivables, 90 Days or More Past Due | FHA, VA And USDA Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 243 | 316
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 74,445 | 82,180
Loans and leases, nonaccrual | 774 | 352
Loans and leases, nonaccrual with no related ACL | 101 | 71
Commercial | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 43,826 | 51,836
Loans and leases, nonaccrual | 294 | 249
Loans and leases, nonaccrual with no related ACL | 30 | 64
Commercial | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 29,471 | 28,865
Loans and leases, nonaccrual | 477 | 103
Loans and leases, nonaccrual with no related ACL | 71 | 7
Commercial | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 1,148 | 1,479
Loans and leases, nonaccrual | 3 | 0
Loans and leases, nonaccrual with no related ACL | 0 | 0
Commercial | Financing Receivables, Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 73,336 | 81,529
Commercial | Financing Receivables, Current | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 43,447 | 51,389
Commercial | Financing Receivables, Current | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 28,745 | 28,665
Commercial | Financing Receivables, Current | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 1,144 | 1,475
Commercial | Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 212 | 207
Commercial | Financing Receivables, 30 to 59 Days Past Due | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 61 | 152
Commercial | Financing Receivables, 30 to 59 Days Past Due | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 150 | 51
Commercial | Financing Receivables, 30 to 59 Days Past Due | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 1 | 4
Commercial | Financing Receivables, 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 77 | 70
Commercial | Financing Receivables, 60 to 89 Days Past Due | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 18 | 25
Commercial | Financing Receivables, 60 to 89 Days Past Due | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 59 | 45
Commercial | Financing Receivables, 60 to 89 Days Past Due | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 0 | 0
Commercial | Financing Receivables, 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 46 | 22
Commercial | Financing Receivables, 90 Days or More Past Due | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 6 | 21
Commercial | Financing Receivables, 90 Days or More Past Due | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 40 | 1
Commercial | Financing Receivables, 90 Days or More Past Due | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 0 | 0
Retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 71,514 | 74,482
Loans and leases, nonaccrual | 590 | 592
Loans and leases, nonaccrual with no related ACL | 352 | 385
Retail | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 31,332 | 29,921
Loans and leases, nonaccrual | 177 | 234
Loans and leases, nonaccrual with no related ACL | 144 | 187
Retail | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 15,040 | 14,043
Loans and leases, nonaccrual | 285 | 241
Loans and leases, nonaccrual with no related ACL | 198 | 185
Retail | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 8,258 | 12,292
Loans and leases, nonaccrual | 61 | 56
Loans and leases, nonaccrual with no related ACL | 7 | 9
Retail | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 11,834 | 12,808
Loans and leases, nonaccrual | 28 | 33
Loans and leases, nonaccrual with no related ACL | 3 | 3
Retail | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 5,050 | 5,418
Loans and leases, nonaccrual | 39 | 28
Loans and leases, nonaccrual with no related ACL | 0 | 1
Retail | Financing Receivables, Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 69,775 | 72,998
Retail | Financing Receivables, Current | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 30,499 | 29,228
Retail | Financing Receivables, Current | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 14,640 | 13,719
Retail | Financing Receivables, Current | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 8,005 | 12,039
Retail | Financing Receivables, Current | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 11,732 | 12,718
Retail | Financing Receivables, Current | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 4,899 | 5,294
Retail | Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 606 | 391
Retail | Financing Receivables, 30 to 59 Days Past Due | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 282 | 95
Retail | Financing Receivables, 30 to 59 Days Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 82 | 64
Retail | Financing Receivables, 30 to 59 Days Past Due | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 144 | 152
Retail | Financing Receivables, 30 to 59 Days Past Due | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 49 | 36
Retail | Financing Receivables, 30 to 59 Days Past Due | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 49 | 44
Retail | Financing Receivables, 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 256 | 156
Retail | Financing Receivables, 60 to 89 Days Past Due | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 118 | 45
Retail | Financing Receivables, 60 to 89 Days Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 33 | 19
Retail | Financing Receivables, 60 to 89 Days Past Due | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 48 | 45
Retail | Financing Receivables, 60 to 89 Days Past Due | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 23 | 17
Retail | Financing Receivables, 60 to 89 Days Past Due | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 34 | 30
Retail | Financing Receivables, 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 287 | 345
Retail | Financing Receivables, 90 Days or More Past Due | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | 256 | 319
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 | 4
Retail | Financing Receivables, 90 Days or More Past Due | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and leases | $ 29 | $ 22

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