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ALLOWANCE FOR CREDIT LOSSES, NONACCRUAL LOANS AND LEASES, AND CONCENTRATIONS OF CREDIT RISK - Troubled Debt Restructurings (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Charge-offs from modification of loans | $ 6 | $ 51 | $ 7
Unfunded commitments related to TDRs | 56 | 49 |
TDR's that defaulted within 12 months of modification date | 118 | 100 | 38
Commercial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
TDR's that defaulted within 12 months of modification date | 23 | 54 | 1
Retail |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
TDR's that defaulted within 12 months of modification date | 95 | 46 | 37
Retail | Loans Insured or Guaranteed by US Government Authorities |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
TDR's that defaulted within 12 months of modification date | $ 61 | $ 16 | $ 9

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- Definition Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953682-111524 + Details
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