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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 |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Charge-offs | $ 59 |  |
Provision expense (benefit) for loans and leases | 3 | $ (140) |
Allowance for credit loss, reserve build | $ 56 |  |
Economic forecast that generally reflects real GDP growth on an annual average basis | 2.50% |  | 2.80%
Economic forecast that generally reflects average unemployment rate | 5.20% |  | 6.00%
Loans and leases | $ 131,305 |  | $ 128,163
Mortgage loans collateralized by OREO | 189 |  | 142
Troubled debt restructuring, charge-offs | 1 | $ 2 |
TDR commitment to lend | 76 |  | 56
80 Branches And Deposit Business, HSBC Bank |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Provision expense (benefit) for loans and leases | 24 |  |
Commercial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Charge-offs decrease | 93 |  |
Loans and leases | 61,521 |  | 60,350
Retail |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Charge-offs decrease | 6 |  |
Loans and leases | 69,784 |  | 67,813
Commercial and industrial | Commercial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans and leases | 45,724 |  | 44,500
Collateral Dependent | Home Equity Loan and Residential Mortgages | Retail |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans and leases | 579 |  | 542
Collateral Dependent | Commercial and industrial | Commercial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Loans and leases | $ 21 |  | $ 103

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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 increase (decrease) in allowance for credit loss on financing receivable. + 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) -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 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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