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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Retained earnings |  | $ (7,978) | $ (6,445) |
Income tax expense |  | (658) | (241) | $ (460)
Allowance for credit losses |  | 1,758 | 2,443 |
Charge-offs |  | 325 |  |
Provision for credit losses |  | (411) | 1,616 | 393
Loans and leases |  | 128,163 | 123,090 |
Mortgage loans collateralized by residential real estate property |  | 142 | 119 |
Charge-offs from modification of loans |  | 6 | 51 | 7
TDR's that defaulted within 12 months of modification date |  | 118 | 100 | 38
Allowance, Credit Loss |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Allowance for credit losses |  | 1,934 | 2,670 | 1,296
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] |  |  |  |
Charge-offs increase (decrease) |  | (261) |  |
Allowance for credit losses, individually evaluated for impairment |  | 5 |  |
Loans and leases |  | 60,350 | 60,793 |
TDR's that defaulted within 12 months of modification date |  | 23 | 54 | 1
Commercial | Allowance, Credit Loss |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Allowance for credit losses |  | 974 | 1,419 | 718
Retail |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Charge-offs increase (decrease) |  | (107) |  |
Loans and leases |  | 67,813 | 62,297 |
TDR's that defaulted within 12 months of modification date |  | 95 | 46 | 37
Retail | Allowance, Credit Loss |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Allowance for credit losses |  | 960 | 1,251 | $ 578
Commercial and industrial | Commercial |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Loans and leases |  | 44,500 | 44,173 |
Collateral Dependent | Home Equity Loan And Residential Mortgages | Retail |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Loans and leases |  | 542 | 552 |
Collateral Dependent | Commercial and industrial | Commercial |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Loans and leases |  | $ 103 | $ 206 |

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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=123577603&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: 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=124255206&loc=SL82895884-210446 Reference 4: 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=124255953&loc=SL82919249-210447 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=124255953&loc=SL82919249-210447 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (3) Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (c) Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (1) + Details
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