2023, Finance Lease Finance Lease, Liability, Payments, Due Year Four Total shareholders' equity Beginning balance Ending balance Decrease in shareholders' equity Total shareholders' equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest OAS Oas Net Increase or Decrease in fair value as a result of changes in the OAS assumption used in the model to calculate the fair value of servicing assets. Condensed Cash Flow Statement [Table] Condensed Cash Flow Statement [Table] Level 3 Fair Value, Inputs, Level 3 [Member] LHFS (including $5,673 and $988 at fair value, respectively) Carrying value Loans Receivable Held-for-sale, Amount Lessee, Leases Lessee, Leases [Policy Text Block] Equity-based compensation expense APIC, Share-based Payment Arrangement, Increase for Cost Recognition Derivatives Subject to Master Netting Arrangement [Domain] Derivatives Subject to Master Netting Arrangement [Domain] [Domain] for Derivatives Subject to Master Netting Arrangement [Axis] 2023 Long-term Debt, Maturities, Repayments of Principal in Year Four 2020 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months us-gaap_ScheduleOfChangesInProjectedBenefitObligationsTableTextBlock Schedule Of Changes In Projected Benefit Obligations Inactive Plans [Table Text Block] Schedule Of Changes In Projected Benefit Obligations Inactive Plans Securities Borrowed Securities Borrowed ALLL Loans and Leases Receivable, Allowance Securities, fair value Marketable Securities Tax-exempt interest Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount Notional amount Derivative Liability, Notional Amount SunTrust Banks Inc. SunTrust Banks Inc. [Member] SunTrust Banks Inc. Asset Class [Axis] Asset Class [Axis] Defined Contribution Plan, Minimum Age of Employees Covered Defined Contribution Plan, Age of Employees Covered Defined Contribution Plan, Age of Employees Covered Parent Company Condensed Cash Flow Statement Condensed Cash Flow Statement [Table Text Block] Interest cost Defined Benefit Plan, Interest Cost Other Asset and Liability, Type Property, Plant and Equipment, Type [Axis] Financing Receivable, Allowance for Credit Loss [Table] Financing Receivable, Allowance for Credit Loss [Table] Increase (Decrease) in Other Noncurrent Assets Increase (Decrease) in Other Noncurrent Assets Loss Contingency [Abstract] Loss Contingency [Abstract] Truist Bank Truist Bank [Member] Truist Bank 2020, Finance Leases Finance Lease, Liability, Payments, Due Next Twelve Months Service charges on deposits Deposit Account [Member] Vested (in units/shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell [Member] Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Compensation, Maximum Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Securities Sold under Agreements to Repurchase Securities Sold under Agreements to Repurchase [Member] Name of Property [Domain] Name of Property [Domain] Current Fiscal Year End Date Current Fiscal Year End Date Operating lease liability Deferred Tax Assets Obligation For Operating Leases Deferred Tax Assets Obligation For Operating Leases Plan amendments Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment Servicing costs Servicing Costs The net increase or decrease in fair value as a result of changes in the servicing costs assumption used in the model to calculate the fair value of servicing assets. Total income Revenues Derivative [Line Items] Derivative [Line Items] Collateral [Axis] Collateral [Axis] Carrying Amount Reported Value Measurement [Member] Fixed income securities Fixed Income Securities [Member] Actual Capital, Ratio Tier One Leverage Capital to Average Assets Short-term Debt, Type [Domain] Short-term Debt, Type [Domain] Issued in connection with preferred stock offering Stock Issued During Period, Value, New Issues Investments in affordable housing projects Affordable housing projects [Member] Affordable housing projects Summary Information Regarding Regulatory Capital Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] Acquired Finite-Lived Intangible Assets [Line Items] Acquired Finite-Lived Intangible Assets [Line Items] Less: imputed interest, Finance Leases Finance Lease, Liability, Undiscounted Excess Amount Premises and equipment Property, Plant and Equipment, Net Property, Plant and Equipment, Net 3 mo. LIBOR funding London Interbank Offered Rate (LIBOR) [Member] Assets held under operating leases (1) Assets Leased to Others [Member] Nonrecurring Adjustment [Axis] Nonrecurring Adjustment [Axis] AOCI Total AOCI Attributable to Parent [Member] Cover page. Cover page. Stock Redeemed or Called During Period, Shares Stock Redeemed or Called During Period, Shares Short-term Debt, Weighted Average Interest Rate, at Point in Time Short-term Debt, Weighted Average Interest Rate, at Point in Time Document Type Document Type Threshold Period Past Due for Placing on Nonaccrual Status of Loans Threshold Period Past Due for Nonaccrual Status of Loans and Leases Receivable Threshold Period Past Due for Nonaccrual Status of Loans and Leases Receivable Rollforward of Level 3 Assets and Liabilities Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Effective Rate Debt Instrument, Interest Rate, Effective Percentage Cash equivalents Cash Equivalents, at Carrying Value Condensed Income Statements, Captions [Line Items] Condensed Income Statements, Captions [Line Items] Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax Defined benefit plan, final years of employment subject to earnings test Defined Benefit Plan, Employment Period Defined Benefit Plan, Employment Period Adjustable-rate residential mortgage loans Adjustable Rate Residential Mortgage [Member] Derivative, Collateral, Obligation to Return Securities Derivative, Collateral, Obligation to Return Securities Repayment of long-term debt Repayments of Long-term Debt Noninterest-bearing deposits Noninterest-bearing Deposit Liabilities Scenario [Domain] Scenario [Domain] Construction in progress Construction in Progress [Member] Commercial and Industrial Sector Commercial and Industrial Sector [Member] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Weighted average maturity of FHLB advances Weighted average maturity of FHLB advances Weighted average maturity of FHLB advances Difference between fair value of securities held and the fair value of the underlying securities, percentage Fair Value, Difference Between Securities Held and Securities Owned, Percentage Fair Value, Difference Between Securities Held and the fair value of the underlying securities, Percentage Other Assets and Liabilities Property, Plant and Equipment, Type [Domain] Approximate weighted average servicing fee on the outstanding balance of residential mortgage loans serviced for others Residential Mortgage Loans Weighted Average Servicing Fee Percentage Represents the weighted average servicing fee earned from servicing residential mortgage loans. The amount is presented as the percentage of fee income divided by the outstanding balances of the residential mortgage loans being serviced. Forfeited (in usd per units/share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Weighted average assumptions used to determine net periodic pension cost: Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] Financial Instrument [Axis] Financial Instrument [Axis] Preferred Stock Preferred Stock [Member] Equity [Abstract] Equity [Abstract] Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Preferred shares outstanding Preferred Stock, Shares Outstanding Noninterest income BusinessCombinationProFormaInformationNoninterestIncomeofAcquireesinceAcquisitionDateActual BusinessCombinationProFormaInformationNoninterestIncomeofAcquireesinceAcquisitionDateActual Residential Mortgage Residential MSRs Residential Mortgage [Member] Income Tax Authority [Domain] Income Tax Authority [Domain] Net interest income BusinessAcquisitionProFormaNetInterestIncome BusinessAcquisitionProFormaNetInterestIncome Commitments and contingencies (Note 16) Commitments and Contingencies Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract] Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract] Debt and Equity Securities, FV-NI [Line Items] Debt and Equity Securities, FV-NI [Line Items] Estimated CECL impact on Allowance for Credit Losses Accounting Standards Update 2016-13 [Member] Derivatives Not Subject to Master Netting Arrangement Derivatives Not Subject to Master Netting Arrangement [Member] Derivatives Not Subject to Master Netting Arrangement Short-term Debt [Line Items] Short-term Debt [Line Items] Securities sold short Financial Instruments Sold, Not yet Purchased, at Fair Value Loss (gain) on early extinguishment of debt Gain (Loss) on Extinguishment of Debt Debt Instrument [Line Items] Debt Instrument [Line Items] Common stock, remaining dollar amount authorized for repurchase Stock Repurchase Program, Remaining Authorized Repurchase Amount Maturity Date Range, Start Debt Instrument, Maturity Date Range, Start Consolidation Items [Domain] Consolidation Items [Domain] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Due in one year or less Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value Defined Contribution Plan, Employer Contribution Expense Defined Contribution Plan, Cost Regulatory Requirements and Other Restrictions Regulatory Capital Requirements under Banking Regulations [Text Block] Asset Class [Domain] Asset Class [Domain] 2022 Defined Benefit Plan, Expected Future Benefit Payment, Year Three Variable Interest Entities Other Commitments [Line Items] Schedule of Changes in Fair Value of Plan Assets Schedule of Changes in Fair Value of Plan Assets [Table Text Block] Central Clearing Parties Central Clearing Parties [Member] Central Clearing Parties [Member] Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Additional collateral that would have been posted had the Company's credit ratings dropped below investment grade Increase Decrease Posted Collateral Increase in the aggregate fair value of assets that are required to be posted as collateral for derivative instruments in the event of a credit ratings downgrade below investment grade. Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] held for sale [Axis] held for sale [Axis] held for sale Series L Series L [Member] Series L Pass Pass [Member] Amounts subject to master netting arrangements not offset due to policy election Derivative Liability, Not Offset, Policy Election Deduction Segments [Axis] Segments [Axis] Other income Noninterest Income, Other Operating Income Issued in connection with equity awards, net Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture Retirement Plan Type [Axis] Retirement Plan Type [Axis] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] CRE mortgages serviced for others covered by recourse provisions Loans Sold with Recourse, Other [Member] Loans Sold with Recourse, Other 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Intangible Assets, Other than Goodwill Financial liabilities: Financial Liabilities Fair Value Disclosure [Abstract] 2020, Operating Leases Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Threshold Period For Past Due Classification for Loans and Leases Receivable Threshold Period Past Due Classification for Loans and Leases Receivable Threshold Period Past Due Classification for Loans and Leases Receivable Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Table Text Block] Securities Sold under Agreements to Repurchase Securities Sold under Agreements to Repurchase Loans Held for Sale [Domain] Loans Held for Sale [Domain] Loans Held for Sale Due after five years through ten years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] Income before income taxes and equity in undistributed earnings of subsidiaries Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Total Debt Securities, Available-for-sale, Amortized Cost, Total Debt Securities, Available-for-sale, Amortized Cost Net change in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Consolidation Items [Axis] Consolidation Items [Axis] 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 actuarial loss (gain) Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During 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BusinessCombinationProFormaInformationNetInterestIncomeofAcquireeSinceAcquisitionDateActual Loans Deferred Tax Asses, Related to Loans Deferred Tax Asses, Related to Loans Dividends from subsidiaries Dividend Income, Operating Table Text Block [Abstract] Table Text Block [Abstract] Position [Domain] Position [Domain] Position [Axis] Position [Axis] Transaction [Domain] Transaction [Domain] Finance Lease Liabilities, Payments, Due Finance Lease, Liability, Payment, Due [Abstract] Long-Term Debt Long-term Debt [Text Block] Other assets (including $3,310 and $1,015 at fair value, respectively) Other Assets Other Assets Summary of Loans and Leases Past Due Policies Summary of Loans and Leases Past Due Policies [Table Text Block] Summary of Loans and Leases Past Due Policies [Table Text Block] Client-related and other risk management Client-related and Other Risk Management [Member] Client-related and Other Risk Management Deposits Deposit Liabilities Disclosures [Text Block] Dividend Rate Preferred Stock, Dividend Rate, Percentage Derivative Financial Instruments Derivatives, Policy [Policy Text Block] Other Deferred Tax Assets, Tax Deferred Expense, Other Other Short-term Borrowings Other Short-term Borrowings Amounts subject to master netting arrangements Derivative Asset, Not Offset, Policy Election Deduction Net Change in Cash and Cash Equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Repurchase of common stock Treasury Stock, Value, Acquired, Par Value Method Financing Receivable, Allowance for Credit Loss [Roll Forward] Financing Receivable, Allowance for Credit Loss [Roll Forward] Alternative Investments [Member] Alternative Investments [Member] This element represents all other investment not specifically defined in the taxonomy. Prepayment speed Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Prepayment Speed Deposits [Abstract] Deposits [Abstract] Leases [Abstract] Leases [Abstract] Debt Instrument [Axis] Debt Instrument [Axis] Equity securities Equity Securities, FV-NI Fair Value Option, Disclosures [Table] Fair Value Option, Disclosures [Table] Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Portion of pre-tax net gain (loss) on terminated hedges to be recognized as a change in interest during the next 12 months 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Receivables [Table Text Block] Income Tax Effect of Items Included in OCI: Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosures [Abstract] Operating Leases, Future Minimum Payments, Due Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Retirement Plan Tax Status [Axis] Retirement Plan Tax Status [Axis] Carrying Amounts and Fair Value of Financial Assets and Liabilities Not Recorded at Fair Value Fair Value, by Balance Sheet Grouping [Table Text Block] Derivative Liability, net Net amount Derivative Liability Recorded Investment With an ALLL Impaired Financing Receivable, with Related Allowance, Recorded Investment DTAs: Deferred Tax Assets, Gross [Abstract] Segment Reporting, Revenue Reconciling Item [Line Items] Segment Reporting, Revenue Reconciling Item [Line Items] Statutory federal tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other Goodwill and other intangible assets Deferred Tax Liabilities, Intangible Assets Tax-exempt interest Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent Assets Sold under Agreements to Repurchase, Type [Domain] Assets Sold under Agreements to Repurchase, Type [Domain] Commercial construction Construction Loans [Member] Cash dividends declared on common stock Dividends, Common Stock, Cash 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. Impaired loans Impaired Loans [Member] Impaired Loans [Member] Class of Stock [Line Items] Class of Stock [Line Items] Summary of Allowance for Credit Losses Financing Receivable, Allowance for Credit Loss [Table Text Block] Fair Value Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Unrecognized pre-tax net gain (loss) on terminated hedges (to be recognized as interest primarily through 2030) UnrecognizedPretaxGainLossOnTerminatedHedges UnrecognizedPretaxGainLossOnTerminatedHedges Commodity Contract Commodity Contract [Member] Performing Performing TDRs Performing Financial Instruments [Member] AOCI, net of deferred income taxes Accumulated Other Comprehensive Income (Loss), Net of Tax Operating lease income Financial Service, Other [Member] Repurchase of common stock Stock Repurchased During Period, Value Derivatives in a net gain position secured by collateral received Derivative Asset, Fair Value, Amount Offset Against Collateral Other Assets and Liabilities [Table] Property, Plant and Equipment [Table] Summary of Deposits Deposit Liabilities, Type [Table Text Block] Interest-bearing deposits with banks Interest-bearing Deposits in Banks and Other Financial Institutions Fixed rate Fixed Rate [Member] Fixed Rate [Member] Net benefit related to FHA matter NetbenefitrelatedtoFHAmatter NetbenefitrelatedtoFHAmatter Income tax credits, net of amortization Effective Income Tax Rate Reconciliation, Tax Credit, Percent Series F Preferred Stock Series F Series F Preferred Stock [Member] Federal Funds Purchased Federal Funds Purchased Liabilities Liabilities Liabilities [Abstract] Leverage Capital: Tier One Leverage Capital [Abstract] 2024, Finance Leases Finance Lease, Liability, Payments, Due Year Five Federal tax reform impact Tax Cuts and Jobs Act, Income Tax Expense (Benefit) Difference in redemption price and carrying value Preferred Stock Redemption Premium Cash dividends paid on common and preferred stock Payments of Dividends Purchases of AFS securities Payments to Acquire Debt Securities, Available-for-sale Offsetting [Abstract] State income taxes, net of federal tax benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Pre-tax gains recognized on mortgage loans sold and held for sale Gain (Loss) on Sale of Mortgage Loans Risk Participation Agreements [Abstract] Risk Participation Agreements [Abstract] Risk Participation Agreements [Abstract] Variable Interest Entity, Primary Beneficiary [Member] Variable Interest Entity, Primary Beneficiary [Member] Grant date fair value of equity-based awards that vested during the year Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Cash Flows From Investing Activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Loans and leases Loans and Finance Receivables [Member] Units/Shares Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Maturity Overnight Maturity Overnight [Member] 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 Service cost Defined Benefit Plan, Service Cost Fair Value Hedges, Net, Total [Abstract] Fair Value Hedges, Net, Total [Abstract] Items Currently Designated Designated as Hedging Instrument [Member] Measurement Input Type [Domain] Measurement Input Type [Domain] Related Party [Domain] Related Party [Domain] Loan-related expense Loan Processing Fee Retirement Plan Tax Status [Domain] Retirement Plan Tax Status [Domain] Schedule of Allocation of Plan Assets Schedule of Allocation of Plan Assets [Table Text Block] Structure Extended Maturity [Member] AFS securities, Fair Value Debt Securities, Available-for-sale, Total AFS securities Debt Securities, Available-for-sale 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. Summary of Income Tax Contingencies Summary of Income Tax Contingencies [Table Text Block] Retained earnings Retained Earnings (Accumulated Deficit) Series D Preferred Stock [Member] Series D Preferred Stock [Member] Repurchase of common stock Payments for Repurchase of Common Stock Payments for Repurchase of Common Stock Schedule of Impaired Financing Receivable [Table] Schedule of Impaired Financing Receivable [Table] Entity Tax Identification Number Entity Tax Identification Number Type of Borrower [Axis] Type of Borrower [Axis] Diluted EPS Earnings Per Share, Diluted Shareholders' Equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Components of Net Periodic Benefit Cost Schedule of Net Benefit Costs [Table Text Block] 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 Unrecognized Tax Benefits, Decrease Resulting from 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