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CREDIT QUALITY AND THE ALLOWANCE FOR CREDIT LOSSES - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans and leases | $ 145,959 | $ 156,662 |
Mortgage loans collateralized by residential real estate property | 336 | 250 |
Net charge-offs | 609 | 270 | $ 325
Provision (benefit) for credit losses | 687 | 474 | (411)
Allowance for credit losses | 78 |  |
Modified TDRs charge-offs | 757 | 434 | 539
Unfunded commitments related to TDRs | 221 | 81 |
Troubled Debt Restructuring |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Modified TDRs charge-offs |  | 3 |
Commercial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Allowance for credit losses, individually evaluated for impairment | 5 |  |
Loans and leases | 74,445 | 82,180 |
Net charge-offs | 267 | 52 | 164
Modified TDRs charge-offs | 285 | 70 | 218
Retail |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans and leases | 71,514 | 74,482 |
Net charge-offs | 342 | 218 | 161
Modified TDRs charge-offs | 472 | 364 | $ 321
Commercial and industrial | Commercial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans and leases | 43,826 | 51,836 |
Modified TDRs charge-offs | 121 |  |
Collateral Dependent | Home Equity Loan And Residential Mortgages | Retail |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans and leases | 556 | 561 |
Collateral Dependent | Commercial and industrial | Commercial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans and leases | $ 233 | $ 21 |

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- Definition Recorded investment in financing receivables that are on nonaccrual status and are collateralized by land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement as of the balance sheet date. + References No definition available. + Details
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