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ALLOWANCE FOR CREDIT LOSSES, NONACCRUING LOANS AND LEASES, AND CONCENTRATIONS OF CREDIT RISK - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Charge-offs | $ 158 |  |
Provision for credit losses | (140) | $ 600 |
ACL Balance | 2,400 |  | $ 2,700
Loans and leases | 122,195 |  | 123,090
Mortgage loans collateralized by OREO | 112 |  | 119
Net change to ALLL from modification | 0 | 4 |
Charge-offs from modification of loans | $ 2 | 2 |
High loan to value criteria (exceeds) | 90.00% |  |
Commercial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Charge-offs | $ 60 |  |
Accrued interest receivable reversed against interest income | 1 | 1 |
Loans and leases | 60,413 |  | 60,793
TDR's that defaulted within 12 months of modification date | 22 | 13 |
Retail |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Charge-offs increase (decrease) | (39) |  |
Accrued interest receivable reversed against interest income | 6 | 5 |
Loans and leases | 61,782 |  | 62,297
TDR's that defaulted within 12 months of modification date | 15 | $ 11 |
Commercial and industrial | Commercial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans and leases | 44,058 |  | 44,173
Collateral Dependent | Home Equity Loan And Residential Mortgages | Retail |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans and leases | 613 |  | 552
Collateral Dependent | Commercial and industrial | Commercial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans and leases | $ 110 |  | $ 206

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- Definition The effect of a change in method or methods for calculating the allowance for credit losses on the current period provision. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
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- Definition Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18794-111554 + Details
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