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Reporting [Abstract] Segment Reporting [Abstract] Net unrecognized after-tax gain (loss) on active hedges recorded in AOCI NetUnrecognizedAfterTaxGainLossOnActiveHedgesRecordedInAoci NetUnrecognizedAfterTaxGainLossOnActiveHedgesRecordedInAoci Benefit Plans Retirement Benefits [Text Block] Maximum recourse exposure from mortgage loans sold with recourse liability Guarantor Obligations, Maximum Exposure, Undiscounted AFS securities: Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] Derivative Instrument [Axis] Derivative Instrument [Axis] Loan servicing rights at fair value MSRs, carrying value, beginning balance MSRs, carrying value, ending balance Commercial MSRs at fair value Servicing Asset at Fair Value, Amount Measurement Frequency [Axis] Measurement Frequency [Axis] Originations of loans and leases, net of principal collected Payments for (Proceeds from) Loans Receivable Securities borrowed, Net Amount Security Borrowed, 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loans. The amount is presented as the percentage of fee income divided by the outstanding balances of the residential mortgage loans being serviced. 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Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Equipment expense Equipment Expense Held/Pledged Financial Instruments Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Security Not Offset Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Securities held as collateral, fair value Securities Held as Collateral, at Fair Value Segment Reporting Segment Reporting [Table Text Block] Use of Estimates in the Preparation of Financial Statements Use of Estimates, Policy [Policy Text Block] Pre-tax gains recognized on mortgage loans sold and held for sale Gain (Loss) on Sale of Mortgage Loans Net change in net pension and postretirement costs Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax Credit Derivatives [Line Items] Credit Derivatives [Line Items] Other direct noninterest expense Other direct noninterest expense Other direct noninterest expense Due after one year through five years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Lessee, Operating Lease, Liability, Maturity Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] ALLL Beginning balance Ending balance Carrying value Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest Document Period End Date Document Period End Date Truist Bank: Subsidiaries [Member] Preferred shares outstanding (in shares) Preferred Stock, Shares Outstanding Loans Converted to Term Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan Net change in AFS securities OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax Securities purchased under agreements to resell, Net Amount Security Purchased under Agreement to Resell, Subject to Master Netting Arrangement, after Offset Amounts Reclassified from AOCI [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Due after ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Trading assets Increase (Decrease) in Debt Securities, Trading, and Equity Securities, FV-NI AOCI, net of deferred income taxes Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Consolidation Items [Domain] Consolidation Items [Domain] Computation of EPS Earnings Per Share [Text Block] Earnings Per Share [Abstract] Earnings Per Share [Abstract] Securities sold under resell agreements and securities borrowed [Line Items] Offsetting Liabilities [Line Items] Offsetting Liabilities [Line Items] Document Fiscal Period Focus Document Fiscal Period Focus Other Debt Securities, Other Assets Debt Securities, Other Assets Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Total trading assets Debt Securities, Trading, and Equity Securities, FV-NI Due in one year or less Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One Total liabilities Liabilities Trading Symbol Trading Symbol Interest rate adjustment Financing Receivable, Modified, Weighted-Average Interest Rate Decrease from Modification Other Community Development Investment Other Community Development Investment [Member] Other Community Development Investment Financing Receivable Financing Receivable, Allowance for Credit Loss [Line Items] Company Selected Measure Name Company Selected Measure Name Purchases of AFS securities Payments to Acquire Debt Securities, Available-for-Sale Risk participation agreements Loan Participations and Assignments [Member] Carrying value, other Other Assets, Carrying Value Nonrecurring Other Assets, Carrying Value Nonrecurring Before tax Reclassification from AOCI, Current Period, before Tax, Attributable to Parent Interest on 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Dividend Income, Operating [Abstract] OCI, net of tax: Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Equity-based compensation expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Level 1 Fair Value, Inputs, Level 1 [Member] Effect of dilutive outstanding equity-based awards (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Derivative asset, gross Derivative assets, fair value Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement Recognized on hedged items Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge Maximum length of time over which forecasted cash flows are hedged Max time period which Truist is hedging a portion of the var. in future cash flows for forecasted transactions excluding those transactions relating to the payment of var. int. on existing instruments Max time period which Truist is hedging a portion of the var. in future cash flows for forecasted transactions excluding those transactions relating to the payment of var. int. on existing instruments Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] Agency MBS – residential Agency MBS – residential Residential Mortgage-Backed Securities [Member] Total securities borrowed or purchased under agreements to resell, Received/Pledged Financial Instruments Security Purchased under Agreement to Resell and Securities Borrowed, Subject to Master Netting Arrangement, Collateral, Obligation to Return Security Not Offset Security Purchased under Agreement to Resell and Securities Borrowed, Subject to Master Netting Arrangement, Collateral, Obligation to Return Security Not Offset ROU assets Operating Lease, Right-of-Use Asset Due in one year or less Debt Securities, Available-for-Sale, Amortized Cost, 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to Noncontrolling Interest AFS, Amortized Cost Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract] Issuances Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Derivative [Table] Derivative [Table] Interest-bearing deposits (including $688 and $639 at fair value, respectively) Interest-Bearing Deposit Liabilities Net unrealized gains (losses) DebtSecuritiesHeldToMaturityAccumulatedGrossUnrealizedGainLossBeforeTax DebtSecuritiesHeldToMaturityAccumulatedGrossUnrealizedGainLossBeforeTax Difference Fair Value, Option, Aggregate Differences, Loans and Long-Term Receivables CRE CRE Commercial Real Estate [Member] Cash Flows From Investing Activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Derivative Asset [Abstract] Derivative Asset [Abstract] Other consumer Other consumer Other Consumer Lending [Member] Other Consumer Lending [Member] Segments [Domain] Segments [Domain] UPB of CRE mortgages serviced for others Unpaid Principal Balance Of Commercial Mortgage Loans Serviced For Others Represents the total unpaid principal balance of commercial real estate mortgage loans serviced by the Registrant for others. Borrowings Debt Disclosure [Text Block] Net unrecognized pre-tax gain (loss) on terminated hedges UnrecognizedPretaxGainLossOnTerminatedHedges UnrecognizedPretaxGainLossOnTerminatedHedges Securities Financing Activities Repurchase Agreements, Resale Agreements, Securities Borrowed, and Securities Loaned Disclosure [Text Block] Net unrealized gains (losses) Debt Securities Available For Sale Accumulated Gross Unrealized Gain Loss Before Tax Excluding Portfolio Level Basis Adjustments Debt Securities Available For Sale Accumulated Gross Unrealized Gain Loss Before Tax Excluding Portfolio Level Basis Adjustments PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) Fixed rate Fixed Rate [Member] Fixed Rate [Member] Cash dividends declared on common stock Common stock, aggregate dividends Dividends, Common Stock, Cash Total shareholders’ equity Beginning balance Ending balance Equity, Attributable to Parent Percentage of Total Class of Financing Receivable Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage Securities or Other Assets Sold under Agreements to Repurchase [Axis] Securities or Other Assets Sold under Agreements to Repurchase [Axis] Assets: Assets [Abstract] Payment Delays Payment Deferral [Member] Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost Carrying Amounts by Risk Rating Financing Receivable Credit Quality Indicators [Table Text Block] Nonrecurring Fair Value, Nonrecurring [Member] Professional fees and outside processing Professional Fees Insider Trading Policies and Procedures [Line Items] Nonperforming Nonperforming Financial Instruments [Member] Securities purchased under agreements to resell, Amount in Consolidated Balance Sheets Security Purchased under Agreement to Resell, Subject to Master Netting Arrangement, before Offset With an ALLL Financing Receivable, Excluding Accrued Interest, Nonperforming, With Related Allowance Financing Receivable, Excluding Accrued Interest, Nonperforming, With Related Allowance AFS securities, Fair Value Debt Securities, Available-For-Sale, Unrealized Loss Position, Fair Value [Abstract] Debt Securities, Available-For-Sale, Unrealized Loss Position, Fair Value Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Number of operating segments Number of Operating Segments Anti-dilutive awards (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount UPB of residential mortgage loan servicing portfolio Total Residential Mortgage Servicing Portfolio Represents the unpaid principal balance of total residential mortgage servicing portfolio. This includes the unpaid principal balances held for investment included on the balance sheet as well as the portion serviced for others representing the balances sold to third-party investors. Entity Central Index Key Entity Central Index Key Net Interest Income After Provision for Credit Losses Interest Income (Expense), after Provision for Loan Loss Equity [Abstract] Equity [Abstract] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Risk Participation Agreements Sold Other Credit Derivatives [Member] OCI before reclassifications, net of tax Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Preferred stock, aggregate dividends Dividends, Preferred Stock, Cash Items Currently Designated Designated as Hedging Instrument [Member] Dividend rate Preferred Stock, Dividend Rate, Percentage Financing Receivable, Modified [Table] Financing Receivable, Modified [Table] Other, net Other Comprehensive Income, Other, Net, Tax Tax effects of the increase (decrease) to accumulated comprehensive income during the period related to other, net Treasury rate Debt Instrument, Basis Spread on Variable Rate MSRs and mortgage banking: MSR and mortgage banking [Member] MSR and mortgage banking Without an ALLL Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance AOCI Total AOCI Attributable to Parent [Member] All Individuals All Individuals [Member] Carrying Amount of the Hedged Assets Hedged Asset, Fair Value Hedge Tax Credit and Equity Investments Schedule of Loss Contingencies by Contingency [Table Text Block] Risk participation agreement terms Risk Participation Agreement Terms Risk Participation Agreement Terms Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Net change in HTM securities OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), Tax Statement [Line Items] Statement [Line Items] Total assets Identifiable assets (period end) of continuing operations Assets Other Finance Receivable, Adjustments and Suspense, Writeoff Finance Receivable, Adjustments and Suspense, Writeoff Commercial and industrial Commercial and industrial Commercial and Industrial [Member] Commercial And Industrial [Member] SBIC and certain other equity method investments: Private Equity Funds [Member] Term Extensions Extended Maturity [Member] Total interest expense Interest Expense, Operating Other trading liabilities Trading Liabilities Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Operating Segments Operating Segments [Member] Other Financing Receivable, Adjustments and Suspense Financing Receivable, Adjustments and Suspense Gross Unrealized Gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized 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Outstanding Award Timing Disclosures [Line Items] Changes In AOCI [Table] Changes In AOCI [Table] Renewals Renewals [Member] Renewals HTM securities: Debt Securities, Available-for-Sale and Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss [Abstract] Carrying Amounts and Fair Value of Financial Assets and Liabilities Not Recorded at Fair Value Fair Value, by Balance Sheet Grouping [Table Text Block] Corporate and other debt securities Corporate Debt Securities [Member] Diluted EPS (in dollars per share) Diluted EPS (in dollars per share) Earnings Per Share, Diluted Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Regulatory costs Federal Deposit Insurance Corporation Premium Expense Litigation Case [Domain] Litigation Case [Domain] Amortization of intangibles Intangible Asset, Finite-Lived, Amortization Expense Year Four Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year LHFS Financing Receivable [Member] Offsetting Assets Offsetting Assets [Table Text Block] Other Other Assets, Fair Value [Member] Other Assets, Fair Value Tax effect Reclassification from AOCI, Current Period, Tax Unused borrowing capacity: Line of Credit Facility, Remaining Borrowing Capacity Total Carrying Amount of Pledged Assets by Asset Type Schedule of Financial Instruments Owned and Pledged as Collateral [Table Text Block] Other income Service, Other [Member] Financial assets: Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Repurchase of common stock, including excise tax Repurchase of common stock Stock Repurchased During Period, Value Investment, Proportional Amortization Method, Elected, Statement of Financial Position [Extensible Enumeration] Investment, Proportional Amortization Method, Elected, Statement of Financial Position [Extensible Enumeration] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Changes in Accounting Principles and Effects of New Accounting Standards Accounting Standards Update and Change in Accounting Principle [Table Text Block] Other deposit revenue Deposit Account [Member] Capitalizations Capitalizations [Member] Capitalizations Cash Dividends Declared per Share Dividends Declared [Table Text Block] Loans Insured or Guaranteed by Government Authorities [Domain] Loans Insured or Guaranteed by Government Authorities [Domain] Securities sold under agreements to repurchase, Net Amount Security Sold under Agreement to Repurchase, Subject to Master Netting Arrangement, after Offset Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Other community development investments FederalIncomeTaxCreditsRecognizedInTaxExpense FederalIncomeTaxCreditsRecognizedInTaxExpense Service cost Defined Benefit Plan, Service Cost Equity securities Equity Securities [Member] Revolving Credit Financing Receivable, Excluding Accrued Interest, Revolving Allowance for Credit Losses Financing Receivable, Allowance for Credit Loss [Table Text Block] Beginning balance Ending balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Other Assets and Liabilities Other Assets Disclosure [Text Block] Securities borrowed, Amount in Consolidated Balance Sheets Security Borrowed, Subject to Master Netting Arrangement, before Offset Commercial Mortgage Banking Activities Summary of Commercial Mortgage Banking Activities [Table Text Block] Summary of Commercial Mortgage Banking Activities AFS securities, ACL Debt Securities, Available-for-Sale, Allowance for Credit Loss 12 months or more, Unrealized Losses Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss AOCI Comprehensive Income (Loss) Note [Text Block] Product and Service [Domain] Product and Service [Domain] Class of Stock [Line Items] Class of Stock [Line Items] Noninterest Expense Noninterest Expense [Abstract] Common Stock Shares Issued Not Disclosed Common Stock Shares Issued Not Disclosed Common Stock Shares Issued Not Disclosed Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Card and treasury management fees Credit Card [Member] Loans modified, in payment default Financing Receivable, Modified, Subsequent Default Marketing and customer development Marketing and Advertising Expense Termination Date Trading Arrangement Termination Date Other Commitments [Axis] Other Commitments [Axis] Securities sold under agreements to repurchase, Received/Pledged Financial Instruments Security Sold under Agreement to Repurchase, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Security Not Offset Loans and leases Loans and Leases [Member] Loans and Leases Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. 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SelectedInformationAboutNonperformingAssets Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Common stock, remaining dollar amount authorized for repurchase Share Repurchase Program, Remaining Authorized, Amount Arrangement Duration Trading Arrangement Duration Securities sold under agreements to repurchase, Amount Not Offset in Consolidated Balance Sheets Security Sold under Agreement to Repurchase, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset Consolidation Items [Axis] Consolidation Items [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Less than 12 months, Unrealized Losses Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Other long-term debt Other Long-Term Debt [Member] Represents other forms of long-term debt not presented elsewhere in the long-term debt footnote table. Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] ALLL SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member] Gross Carrying Amount Intangible Asset, Finite-Lived, before Accumulated Amortization Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Loan Restructuring Modification [Axis] Loan Restructuring Modification [Axis] Intangible Asset, Finite-Lived, Class [Domain] Intangible Asset, Finite-Lived, Class [Domain] Assets and Liabilities Measured at Fair Value on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] All Award Types Award Type [Domain] Amortization Method Applied Income Tax Credit And Other Tax Benefit Amortization Statement Of Cash Flows Extensible Enumeration Not Disclosed Flag Amortization Method Applied Income Tax Credit And Other Tax Benefit Amortization Statement Of Cash Flows Extensible Enumeration Not Disclosed Flag Amortization Method Applied Income Tax Credit And Other Tax Benefit Amortization Statement Of Cash Flows Extensible Enumeration Not Disclosed Flag Fair Value Option, Disclosures [Table] Fair Value Option, Disclosures [Table] Fair Value Disclosures Fair Value Disclosures [Text Block] Level 3 Fair Value, Inputs, Level 3 [Member] HTM, Amortized Cost: Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date [Abstract] Asset Pledged as Collateral Asset Pledged as Collateral [Member] Purchased options Option Trades [Member] Option trades [Member] Schedule of Short-term Debt [Table] Short-Term Debt [Table] Net change in short-term borrowings Proceeds from (Repayments of) Other Debt Other assets (including $1,841 and $1,725 at fair value, respectively) Other Assets Financing Receivable, Modified, Subsequent Default Financing Receivable, Modified, Subsequent Default [Table Text Block] Carrying Amount of the Hedged Liability Hedged Liability, Fair Value Hedge Up to 30 days Maturity Less than 30 Days [Member] Derivatives subject to master netting arrangement or similar arrangement Derivatives Subject to Master Netting Arrangement [Member] Derivatives Subject to Master Netting Arrangement [Member] Noninterest Income Noninterest Income [Abstract] Cash and Cash Equivalents of Continuing and Discontinued Operations, January 1 Cash and Cash Equivalents of Continuing and Discontinued Operations, June 30 Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] Non-NEOs Non-NEOs [Member] Financing Receivable, Allowance for Credit Loss [Roll Forward] Financing Receivable, Allowance for Credit Loss [Roll Forward] Overnight and Continuous Maturity Overnight [Member] AOCI [Line Items] AOCI [Line Items] Other Comprehensive Income Loss Before Tax Period Increase Decrease Line Items Net Amount Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral Brokered time deposits, UPB Time Deposits, Principal Outstanding Time Deposits, Principal Outstanding Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Due after five years through ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Repurchase of common stock Payments for Repurchase of Common Stock Statistical Measurement [Axis] Statistical Measurement [Axis] 30-89 Days Past Due Financing Receivables 30 To 89 Days Past Due [Member] Financing Receivables 30 To 89 Days Past Due Impact of Derivatives on the Consolidated Statements of Income and Comprehensive Income Derivative Instruments, Gain (Loss) [Table Text Block] Award Type Award Type [Axis] Pre-tax gain (loss) recognized in OCI: Other 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between two counterparties whereby one counterparty agrees to pay a floating rate of interest and the other commits to pay a floating rate of interest on a predetermined notional amount. 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Amount offset Derivative Asset, Subject to Master Netting Arrangement, Gross Liability and Collateral, Obligation to Return Cash, Offset Name Trading Arrangement, Individual Name Reclassification, Segmentation Basis Change, Adjustment Reclassification, Segmentation Basis Change, Adjustment [Member] Reclassification, Segmentation Basis Change, Adjustment Other liabilities, fair value Other Liabilities, Fair Value Disclosure Company Selected Measure Amount Company Selected Measure Amount Total return swaps Total Return Swap [Member] Securities sold under agreements to repurchase, Amount in Consolidated Balance Sheets Security Sold under Agreement to Repurchase, Subject to Master Netting Arrangement, before Offset Issued in connection with equity awards, net (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Accounts and Financing Receivables [Table] Weighted average remaining term 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and exchange traded derivatives Derivative Liability, Subject to Master Netting Arrangement, Asset Offset Cash collateral (received) posted for amounts subject to master netting arrangements Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset Derivatives Credit Risk - Risk Participation Agreements and Total Return Swaps DerivativesCreditRiskRiskParticipationAgreements [Table Text Block] DerivativesCreditRiskRiskParticipationAgreements [Table Text Block] Common stock, $5 par value Common Stock, Value, Issued Long-Term Debt, Interest Rates and Maturity Dates Schedule of Long-Term Debt Instruments [Table Text Block] Restatement Determination Date Restatement Determination Date Cash collateral (received) posted for amounts subject to master netting arrangements Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash, Offset Against Derivative Asset Estimated return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Loans and ACL Financing Receivables [Text Block] Amendment Flag Amendment Flag Debt and Equity Securities, FV-NI [Line Items] Debt and Equity Securities, FV-NI [Line Items] Credit default swaps Credit Default Swap [Member] Financing Receivable, Modified, Past Due Financing Receivable, Modified, Past Due [Table Text Block] Gross Unrealized Losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Letters of credit and financial guarantees Standby Letters of Credit [Member] AFS and HTM Securities Debt Securities, Available-for-Sale [Table Text Block] Investments [Domain] Investments [Domain] FHLB Advances FHLB advances FHLB Federal Home Loan Bank Advances [Member] Assets held under operating leases Property, Plant, and Equipment, Lessor Asset under Operating Lease, before Accumulated Depreciation Servicing Asset at Fair Value, Amount [Roll Forward] Servicing Asset at Fair Value, Amount [Roll Forward] Adjustment to 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Deposits in Banks and Other Financial Institutions RUFC Commitments to extend, originate, or purchase credit and other commitments Unfunded Loan Commitment [Member] Due after five years through ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Total noninterest income Servicing fees recognized from mortgage loans serviced for others Noninterest income Noninterest Income Notional amount, maximum recourse exposure, recorded reserves Fair Value Disclosure, off-Balance-Sheet Risks, Face Amount, Liability, Maximum Recourse Exposure, Recorded Reserves Fair Value Disclosure, off-Balance-Sheet Risks, Face Amount, Liability, Maximum Recourse Exposure, Recorded Reserves WB Wholesale Banking [Member] Wholesale Banking [Member] Time deposits Time Deposits Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Cash dividends paid on preferred stock Payments of Ordinary Dividends, Preferred Stock and Preference Stock Class of Stock [Axis] Class of Stock [Axis] Net income available to common shareholders Net income available to common shareholders Net Income (Loss) Available to Common Stockholders, Basic Supplemental Disclosure of Cash Flow Information: Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract] CSBB Consumer and Small Business Banking [Member] Consumer and Small Business Banking [Member] Accumulated Amortization Intangible Asset, Finite-Lived, Accumulated Amortization Receivable [Domain] Receivable [Domain] Analysis of Activity in Residential MSRs Schedule of Servicing Assets at Fair Value [Table Text Block] Brokered time deposits, difference Fair Value Option, Aggregate Difference, Deposits Fair Value Option, Aggregate Difference, Deposits 5.853% Fixed-to-Floating Rate Normal Preferred Purchase Securities each representing 1/100th interest in a share of Series J Perpetual Preferred Stock Series J Series J Preferred Stock [Member] Series J Preferred Stock Cash dividends declared on preferred stock Dividends, Preferred Stock Residential Mortgage Banking Activities Residential Mortgage Banking Activities [Table Text Block] Presents a summary of information related to residential mortgage banking activities including a reconciliation of mortgage loans managed to mortgage loans held for investment on the balance sheet; along with past due, nonaccrual and charge-off data related to these loans. Also includes details about the servicing portfolio, recourse and repurchase exposure and loan sales occurring during the period Loans and leases, net of ALLL Loans and leases, net of ALLL Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss Financing Receivable, Modified, Subsequent Default [Table] Financing Receivable, Modified, Subsequent Default [Table] Total Financing Receivable, Allowance for Credit Loss, Writeoff Changes in Accounting Principles and Effects of New Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Litigation Case [Axis] Litigation Case [Axis] Investment Program Proportional Amortization Method Applied Income Tax Credit And Other Tax Benefit Amortization Statement Of Cash Flows Extensible Enumeration Not Disclosed Flag Investment Program Proportional Amortization Method Applied Income Tax Credit And Other Tax Benefit Amortization Statement Of Cash Flows Extensible Enumeration Not Disclosed Flag Investment Program Proportional Amortization Method Applied Income Tax Credit And Other Tax Benefit Amortization Statement Of Cash Flows Extensible Enumeration Not Disclosed Flag Long-term debt Total long-term debt Long-Term Debt Accumulated depreciation Property, Plant, and Equipment, Lessor Asset under Operating Lease, Accumulated Depreciation Year Three Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year Net change in operating assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Less than 12 months, Unrealized Losses Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Net cash flows from investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Due after five years through ten years Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Shareholders' Equity Equity [Text Block] Weighted average interest rate on mortgage loans serviced for others Weighted Average Interest Rate Serviced For Others Represents the weighted average interest rate on the portfolio of residential mortgage loans serviced for others. Security Exchange Name Security Exchange Name Amount offset Amount offset Derivative Liability, Subject to Master Netting Arrangement, Gross Asset and Collateral, Right to Reclaim Cash, Offset Bank Servicing Bank Servicing [Member] Total loans and leases measured at fair value on a nonrecurring basis still held Loans Receivable, Fair Value Adjustment Recorded in Any Period Loans Receivable, Fair Value Adjustment Recorded in Any Period Effect on fair value of a 10% increase Sensitivity Analysis Of Fair Value Of 10 Percent Increase In Weighted Average OAS Effect on fair value of a 10% increase in weighted average OAS Accruing Financing Receivable, before Allowance for Credit Loss Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Income or Comprehensive Income [Extensible Enumeration] Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Income or Comprehensive Income [Extensible Enumeration] Total liabilities Liabilities, Fair Value Disclosure Debt Securities, Held-to-Maturity, Fair Value Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value [Abstract] Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value Due after one year through five years Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five 12 months or more, Fair Value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Name Outstanding Recovery, Individual Name Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Held/Pledged Financial Instruments Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Security Not Offset CRE mortgages originated Origination Of Commercial Real Estate Mortgages Represents the dollar amount of commercial real estate mortgage loans originated during the period. Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Lending exposure Affordable Housing Projects Lending Commitments Lending commitments to Affordable Housing Projects Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] HTM securities, ACL Debt Securities, Held-to-Maturity, Allowance for Credit Loss Tax Credits and Amortization, Tax Credit Investment Activity Summary of Tax Credits and Amortization, Tax Credit Investment Activity [Table Text Block] Summary of Tax Credits and Amortization, Tax Credit Investment Activity Depositary Shares each representing 1/4,000th interest in a share of Series I Perpetual Preferred Stock Series I Series I Preferred Stock [Member] Series I Preferred Stock Amounts reclassified, net of tax Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Effect on fair value of a 20% increase Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 20 Percent Adverse Change in Prepayment Speed Net cash received (paid) for securities borrowed or purchased under agreements to resell Proceeds from (Payments for) Federal Funds Sold and Securities Purchased under Agreements to Resell, Net Reclassification, Type [Axis] Reclassification, Type [Axis] Preferred stock, dividends per share (in dollars per share) Preferred Stock, Dividends, Per Share, Cash Paid Deferred gains recorded in AOCI Debt Securities, Held-to-Maturity, Derivative, Cumulative Gain (Loss) Total, Fair Value Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value Interest on long-term debt Interest Expense, Long-Term Debt Due in one year or less Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Other, net AOCI, Other, Attributable to Parent [Member] AOCI, Other, Attributable to Parent [Member] Pension and OPEB Costs Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Total AFS securities, amortized cost Debt Securities Available For Sale Amortized Cost Including Portfolio Level Basis Adjustments Debt Securities Available For Sale Amortized Cost Including Portfolio Level Basis Adjustments Combination - Capitalization and Term Extension Combination - Capitalization and Term Extension [Member] Combination - Capitalization and Term Extension Residential mortgage Residential MSRs Residential Mortgage [Member] Asset Class [Domain] Asset Class [Domain] Notional amount, maximum recourse exposure Fair Value Disclosure, off-Balance-Sheet Risks, Face Amount, Liability, Maximum Recourse Exposure Fair Value Disclosure, off-Balance-Sheet Risks, Face Amount, Liability, Maximum Recourse Exposure Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Diluted weighted average shares outstanding (in shares) Weighted average number of diluted common shares (in shares) Weighted Average Number of Shares Outstanding, Diluted Servicing Assets at Fair Value [Line Items] Servicing Liabilities at Fair Value [Line Items] Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Entity Emerging Growth Company Entity Emerging Growth Company Renewable Energy Investments Renewable Energy Investments [Member] Renewable Energy Investments Residential mortgage loans in the process of foreclosure Mortgage Loans in Process of Foreclosure, Amount Loans and leases (including $10 and $11 at fair value, respectively) Total Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss Underlying Security Market Price Change Underlying Security Market Price Change, Percent Derivative Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Futures and forwards Forward Commitments [Member] Gross Unrealized Losses Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss Short-term borrowings (including $3,121 and $2,394 at fair value, respectively) Short-term borrowings Short-Term Debt Indemnification, recourse, and repurchase reserves Guarantor Obligations, Current Carrying Value Pension asset Increase (Decrease) in Other Noncurrent Assets Closed portfolio of securities hedged, amortized cost Financial Asset, Closed Portfolio, Portfolio Layer Method, Amortized Cost Total Modified Loans Financing Receivable, Modified in Period, Amount Other Other AFS Investments [Member] Other AFS Investments Securities purchased under agreements to resell, Received/Pledged Financial Instruments Security Purchased under Agreement to Resell, Subject to Master Netting Arrangement, Collateral, Obligation to Return Security Not Offset Intangible Asset, Goodwill and Other [Abstract] Intangible Asset, Goodwill and Other [Abstract] Additions Servicing Asset at Fair Value, Additions Securities sold short Financial Instruments Sold, Not yet Purchased, at Fair Value Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Transfers and Servicing [Abstract] Transfers and Servicing [Abstract] Fair Value and UPB of LHFS Fair Value Option, Disclosures [Table Text Block] Residential MSRs Sensitivity Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets [Table Text Block] Year Three Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff All Executive Categories All Executive Categories [Member] Swaps Swap [Member] Interest rate lock commitments Interest Rate Lock Commitments [Member] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Amounts reclassified from AOCI: Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Components of Net Periodic Benefit Cost Schedule of Net Benefit Costs [Table Text Block] Change in fair value due to changes in valuation inputs or assumptions Prepayment Speed Assumption The net Increase or Decrease in fair value as a result of changes in the prepayment speed assumption used in the model to calculate the fair value of servicing assets. Asset Acquisition [Domain] Asset Acquisition [Domain] Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Basic and Diluted EPS Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Operating Segments Segment Reporting [Text Block] Proceeds from maturities, calls and paydowns of AFS securities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Minimum Minimum [Member] Fixed-rate residential mortgage loans Fixed Rate Residential Mortgage [Member] Investment Type [Axis] Investment Type [Axis] Servicing Assets at Fair Value [Line Items] Servicing Assets at Fair Value [Line Items] Less than 12 months, Fair Value Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value Contribution to settlement fund Litigation Settlement, Maximum Exposure to Loss Litigation Settlement, Maximum Exposure to Loss UPB Loan, Held-for-Sale or Securitization or Asset-Backed Financing Arrangement, Principal Outstanding Derivative liability, gross Derivative liability, fair value Derivative Liability, Gross Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement Liabilities Liabilities: Liabilities [Abstract] Location, Statement of Income, Balance [Axis] Location, Statement of Income, Balance [Axis] Investments in affordable housing projects and other qualified tax credits Investment Program, Proportional Amortization Method, Applied, Amortization Expense Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Schedule of Managing of Risks Inherent in Servicing Assets and Servicing Liabilities [Table] Servicing Asset and Servicing Liability, Risk Mitigation [Table] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Net Derivatives Derivative [Member] Other liabilities (including $2,228 and $1,797 at fair value, respectively) VIE liabilities Other Liabilities Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Income or Comprehensive Income [Extensible Enumeration] Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Income or Comprehensive Income [Extensible Enumeration] Net periodic (benefit) cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Financing Receivable, Allowance for Credit Loss [Table] Financing Receivable, Allowance for Credit Loss [Table] Common shares authorized (in shares) Common Stock, Shares Authorized Prepayment speed Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Prepayment Speed OT&C Other, Treasury & Corporate [Member] Other, Treasury & Corporate [Member] Total securities borrowed or purchased under agreements to resell, Amount Not Offset in Consolidated Balance Sheets Security Purchased under Agreement to Resell and Securities Borrowed, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset Security Purchased under Agreement to Resell and Securities Borrowed, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset Due after ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Exercise Price Award Exercise Price Investment banking and trading income Investment Advisory, Management and Administrative Service [Member] Segment Reporting [Line Items] Segment Reporting [Line Items] Amount authorized for repurchase Share Repurchase Program, Authorized, Amount Document Quarterly Report Document Quarterly Report Realization of expected net servicing cash flows, passage of time, and other Servicing Asset at Fair Value, Other Changes in Fair Value Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] States and political subdivisions US States and Political Subdivisions Debt Securities [Member] Subordinated notes Senior Subordinated Notes [Member] Special mention Special Mention [Member] Year Four Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff Proceeds from sales of AFS securities Proceeds from Sale of Debt Securities, Available-for-Sale Other Other Loan Modifications [Member] Other Loan Modifications Repayment of long-term debt Repayments of Long-Term Debt Derivative Liability [Abstract] Derivative Liability [Abstract] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Carrying amount Equity Method Investments Equity Component [Domain] Equity Component [Domain] Included in earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items] Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items] Foreign exchange contracts: Foreign exchange contracts Foreign Exchange Contract [Member] Loans and leases Loans and leases Loans Receivable, Fair Value Disclosure Adoption Date Trading Arrangement Adoption Date Equity securities Equity Securities, FV-NI, Current Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Lease liabilities Operating Lease, Liability HTM securities, fair value Total HTM securities Debt Securities, Held-to-Maturity, Fair 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