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ALLOWANCE FOR CREDIT LOSSES, NONACCRUAL LOANS AND LEASES, AND CONCENTRATIONS OF CREDIT RISK - Narrative (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Retained earnings |  | $ (9,159) | $ (7,978) |
Income tax expense |  | (582) | (658) | $ (241)
Allowance for credit losses |  | 306 |  |
Net charge-offs |  | 270 | 325 | 693
ACL on PCD loans and leases and unfunded lending commitments at acquisition |  | 102 |  |
Provision (benefit) for credit losses |  | 474 | (411) | 1,616
Loans and leases |  | 156,662 | 128,163 |
Mortgage loans collateralized by residential real estate property |  | 250 | 142 |
Charge-offs |  | 434 | 539 | 843
Unfunded commitments related to TDRs |  | 81 | 56 |
Troubled Debt Restructuring |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Charge-offs |  | 3 | 6 | 51
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Retained earnings | $ 337 |  |  |
Income tax expense | 114 |  |  |
Allowance for credit losses | $ 451 |  |  |
Commercial |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Allowance for credit losses, individually evaluated for impairment |  | 5 |  |
Net charge-offs |  | 52 | 164 | 425
Loans and leases |  | 82,180 | 60,350 |
Charge-offs |  | 70 | 218 | 437
Retail |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Net charge-offs |  | 218 | 161 | 268
Loans and leases |  | 74,482 | 67,813 |
Charge-offs |  | 364 | 321 | $ 406
Commercial and industrial | Commercial |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Loans and leases |  | 51,836 | 44,500 |
Collateral Dependent | Home Equity Loan And Residential Mortgages | Retail |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Loans and leases |  | 561 | 542 |
Collateral Dependent | Commercial and industrial | Commercial |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Loans and leases |  | $ 21 | $ 103 |

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