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ALLOWANCE FOR CREDIT LOSSES, NONACCRUAL LOANS AND LEASES, AND CONCENTRATIONS OF CREDIT RISK - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
ACL Balance | $ 2,000 |  | $ 2,000 |  | $ 2,700
Charge-offs |  |  | 280 |  |
Provision charged to income | (33) | $ 428 | (386) | $ 1,492 |
Loans and leases | 123,318 |  | 123,318 |  | 123,090
Mortgage loans collateralized by OREO | 150 |  | 150 |  | 119
Commercial |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Charge-offs increase (decrease) |  |  | (126) |  |
Loans and leases | 57,955 |  | 57,955 |  | 60,793
Retail |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Charge-offs increase (decrease) |  |  | (97) |  |
Loans and leases | 65,363 |  | 65,363 |  | 62,297
Commercial and industrial | Commercial |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Loans and leases | 41,854 |  | 41,854 |  | 44,173
Collateral Dependent | Home Equity Loan and Residential Mortgages | Retail |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Loans and leases | 543 |  | 543 |  | 552
Collateral Dependent | Commercial and industrial | Commercial |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Loans and leases | $ 42 |  | $ 42 |  | $ 206

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- Definition Amount of writeoff of financing receivable, charged against allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 + Details
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