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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Jan. 01, 2020 | Dec. 31, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Allowance for credit loss, reserve build | $ 463 |  |  |
ACL Balance | 2,210 |  | $ 1,747 | $ 1,296
Loans and leases | 127,528 |  |  | 119,088
Mortgage loans collateralized by OREO | 144 |  |  | 152
Net change to ALLL from modification | 4 | $ 2 |  |
Charge-offs from modification of loans | $ 2 | 1 |  |
High loan to value criteria (exceeds) | 90.00% |  |  |
Commercial |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
ACL Balance | $ 790 |  | 539 | 718
Accrued interest receivable reversed against interest income | 1 |  |  |
Loans and leases | 66,032 |  |  | 57,538
TDR's that defaulted within 12 months of modification date | 13 | 0 |  |
Retail |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
ACL Balance | 1,420 |  | 1,208 | 578
Accrued interest receivable reversed against interest income | 5 |  |  |
Loans and leases | 61,496 |  |  | 61,550
TDR's that defaulted within 12 months of modification date | 11 | $ 9 |  |
Commercial | Commercial |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
ACL Balance | 613 |  | $ 376 | 575
Loans and leases | $ 49,092 |  |  | 41,479
Collateral Dependent | Home Equity Loan And Residential Mortgages | Retail |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Collateral value, valuation frequency period | 90 days |  |  |
Loans and leases | $ 271 |  |  | 227
Collateral Dependent | Commercial | Commercial |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Loans and leases | $ 155 |  |  | $ 85

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- Definition An entity's internal risk assessment as having high risk defined as certain loans with outstanding balances exceeding a percentage of the value of underlying collateral. + References No definition available. + Details
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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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- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118955202&loc=SL82895884-210446 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 + Details
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