Net unrealized losses on available-for-sale debt securities transferred to held-to-maturity securities: OCI, Debt Securities, Available-for-Sale, Gain (Loss), before Adjustment, after Tax [Abstract] Interest receivable excluded from plan assets Defined Benefit Plan, Accrued Interest Receivable Excluded From Plan Assets Defined Benefit Plan, Accrued Interest Receivable Excluded From Plan Assets Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Portfolio loans and leases: Loans and Leases Receivable, Net of Deferred Income [Abstract] Type Of Asset Measured At Level Three Axis [Domain] Type Of Asset Measured At Level Three Axis [Domain] Type Of Asset Measured At Level Three Axis [Domain] Commodity contracts Commodity Contract [Member] Schedule of Estimated Future Benefit Payments Schedule of Expected Benefit Payments [Table Text Block] Award Timing Predetermined Award Timing Predetermined [Flag] Proportional amortization Investment Program, Proportional Amortization Method, Applied, Amortization Expense Entity File Number Entity File Number Private Placement Securities Private Placement Securities [Member] Private Placement Securities Capital Surplus Additional Paid-in Capital [Member] Tabular List, Table Tabular List [Table Text Block] Target allocations for plan investments Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 30-89 days past due 30 to 89 Days Financial Asset 30 to 89 Days Past Due [Member] Financial Asset, 30 to 89 Days Past Due [Member]. Accounting and Reporting Developments New Accounting Pronouncements, Policy [Policy Text Block] Loans Measured At Fair Value Loans Measured At Fair Value [Member] Loans Measured At Fair Value Commercial Banking Commercial Banking [Member] Commercial Banking 2031 - 2035 Defined Benefit Plan, Estimated Future Benefit Payments, After Year Four For Next Five Years Defined Benefit Plan, Estimated Future Benefit Payments, After Year Four For Next Five Years Fair Value Measurements Fair Value Measurement and Measurement Inputs, Recurring and Nonrecurring [Text Block] Carrying Amounts and Estimated Fair Values for Certain Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Impairment losses Investment Program, Proportional Amortization Method, Elected, Impairment Loss Outstanding repurchase demand inventory Outstanding repurchase demand inventory Outstanding repurchase demand inventory. Available-for-sale debt and other securities Debt Securities Debt Securities [Member] Goodwill [Line Items] Goodwill Goodwill [Line Items] Measurement Basis [Axis] Measurement Basis [Axis] Adjustment to Compensation: Adjustment to Compensation [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Unpaid principal balance of acquired loans and leases, PSL Financing Receivable, Purchased Seasoned Loan, Amount at Par Value Financing Receivable, Purchased Seasoned Loan, Amount at Par Value Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Recoveries of losses previously charged off Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery Consideration paid Business Combination, Consideration Transferred [Abstract] Fair value changes included in earnings for residential mortgage for which the fair value option was elected Fair Value, Option, Changes in Fair Value, Gain (Loss) Defined Benefit Plan, Plan Assets, Category [Table] Defined Benefit Plan, Plan Assets, Category [Table] Federal Lawsuits Federal Lawsuits [Member] Due after 1 year through 5 years Debt Securities, Held-to-Maturity, Amortized Cost Excluding Accrued Interest, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five Adjustment to Compensation, Amount Adjustment to Compensation Amount Pension Plan Pension Plan [Member] Other assets Increase (Decrease) in Other Operating Assets Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Private equity, cumulative impairment Equity Securities without Readily Determinable Fair Value, Impairment Loss, Cumulative Amount Employee Stock Option Share-Based Payment Arrangement, Option [Member] Impairment charges Asset Impairment Charges Common stock Dividends, Common Stock, Cash Total Equity Beginning Balance Ending Balance Equity, Attributable to Parent Fair Value By Measurement Frequency [Axis] Measurement Frequency [Axis] Measurement Frequency [Axis] Due after 5 years through 10 years Debt Securities, Held-to-Maturity, Amortized Cost Excluding Accrued Interest, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 5 through 10 Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-Sale [Table] Insider Trading Policies and Procedures [Line Items] OAS Spread Assumption, Impact of Adverse Change on Fair Value 20% Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 20 Percent Adverse Change in Discount Rate Common stock, shares authorized (in shares) Common Stock, Shares Authorized Financial assets: Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Loss Contingency [Abstract] Loss Contingency [Abstract] Recurring Fair Value, Recurring [Member] Cover [Abstract] Cover [Abstract] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Series M Preferred Stock Series M Preferred Stock [Member] Series M Preferred Stock Maximum Maximum Maximum [Member] Portfolio loans and leases to OREO Real Estate Owned, Transfer to Real Estate Owned Rate of compensation increase Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase MSR fair value adjustment Msr Fair Value Adjustment MSR fair value adjustment. Net Carrying Amount Finite-Lived Intangible Assets, Net Total Debt Securities, Available-for-Sale, Unrealized Loss Position Due after 10 years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Financing Receivable, Credit Quality Indicator [Table] Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] Retirement Benefits [Abstract] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Redemption Period One Debt Instrument, Redemption, Period One [Member] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Weighted-average length of term extensions Financing Receivable, Modified, Weighted Average Term Increase from Modification Income Before Income Taxes Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Revolving Loans Converted to Term Loans Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan Schedule of Long-Term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Other securities Debt Securities, Held-to-Maturity, Maturity, without Single Maturity Date, Fair Value Loss Contingencies by Nature of Contingency [Axis] Loss Contingency Nature [Axis] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Timing of the resolution of the Covered Litigation Fair Value Inputs Resolution Covered Litigation Fair value inputs resolution covered litigation. Operating Segments Operating Segments [Member] Noncash Investing and Financing Activities Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Unrealized holding (losses) gains arising during period Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Aggregate Unpaid Principal Balance Fair Value Option Loans Held As Assets Aggregate Unpaid Principal Balance Abstract [Abstract] Fair value option loans held as assets aggregate unpaid principal balance abstract. Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Line of Credit Facility [Table] Line of Credit Facility [Table] Short-term Debt [Abstract] Short-Term Debt [Abstract] Total interest expense Interest Expense, Operating Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Loan modification program, percentage of modifications to total portfolio Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage Individually evaluated Financing Receivable, Allowance for Credit Loss, Individually Evaluated Net losses on available-for-sale debt and other securities Debt Securities, Available-for-Sale, Gain (Loss) Document Fiscal Period Focus Document Fiscal Period Focus Derivatives, Fair Value Derivatives, Fair Value Derivatives, Fair Value [Line Items] Difference Between the Fair Value and the Unpaid Principal Balance for Loans Fair Value Option, Disclosures [Table Text Block] Award Timing Method Award Timing Method [Text Block] Total Financing Receivable, Excluding Accrued Interest, Nonaccrual Available-for-sale debt and other securities, amortized cost Total Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss Award Type Award Type [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Parent Company Parent Company [Member] Unaudited Pro Forma Business Combination, Pro Forma Information [Table Text Block] Fixed-Rate/Floating-Rate 4.566 Percent Senior Notes Due April 29, 2032 Fixed-Rate/Floating-Rate 4.566 Percent Senior Notes Due April 29, 2032 [Member] Fixed-Rate/Floating-Rate 4.566 Percent Senior Notes Due April 29, 2032 Other changes in fair value Servicing Asset at Fair Value, Other Changes in Fair Value Commitments Commitments, Fair Value Disclosure Trading Symbol Trading Symbol Total Return Swap Total Return Swap [Member] Interest on long-term debt Interest Expense, Long-Term Debt Proceeds from sales: Proceeds from Investing Activity [Abstract] Entity Address, City or Town Entity Address, City or Town Amount in excess of amounts reserved Loss Contingency, Range of Possible Loss, Portion Not Accrued Net unrealized losses Debt Securities, Trading, Unrealized Gain (Loss) Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] Net trading debt securities losses Total Trading Securities Gains Losses Total trading securities gains losses. Intangible Assets Intangible Assets Disclosure [Text Block] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Initial ALLL on other acquired loans and leases Business Combination, Acquired Receivable, Purchased without Credit Deterioration, Contractual Cash Flow, Estimated Uncollectible Noncredit discount, net, PSL Financing Receivable, Purchased Seasoned Loans, Discount (Premium) Financing Receivable, Purchased Seasoned Loans, Discount (Premium) Income Statement Location [Domain] Income Statement Location [Domain] Statement of Income Location, Balance [Domain] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Damages awarded Loss Contingency, Damages Awarded, Value Fair value of purchase consideration Business Combination, Consideration Transferred Interest on short-term borrowings Interest Expense, Short-Term Borrowings Entity Emerging Growth Company Entity Emerging Growth Company Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Commercial payments revenue Commercial Payments Revenue 2027 Defined Benefit Plan, Expected Future Benefit Payment, Year One Total noninterest income Total noninterest income Noninterest Income Visa Funding and Bancorp Cash Payments Visa Funding Bancorp Cash Payments [Table Text Block] Visa funding bancorp cash payments table text block. Common stock, outstanding (in shares) Common Stock, Shares, Outstanding Schedule of Investment Securities Marketable Securities [Table Text Block] Unrealized Losses Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss Reserve for unfunded commitments Reserve For Unfunded Credit Commitments Reserve For Unfunded Credit Commitments. Loans and Leases Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Noninterest Expense Noninterest Expense [Abstract] Cash and due from banks Cash and Due from Banks Tax credits and other benefits Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization Expense Preferred stock, unissued (in shares) Preferred Stock Shares Unissued Preferred stock shares unissued. Financing Receivable, Recorded Investment, Class of Financing Receivable [Domain] Class of Financing Receivable [Domain] Class of Financing Receivable [Domain] Consumer banking revenue Consumer Banking Revenue Consumer Banking Revenue Origination fees and gains on loan sales Gain (Loss) on Sale of Financing Receivable 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] Standby letters of credit as a percentage of total letters of credit Percentage Of Letter Of Credit Percentage Of Letter Of Credit. Estimated Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Due after 1 year through 5 years Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Interest on securities Interest and Dividend Income, Securities, Operating Applicable income tax expense Applicable income tax expense Income Tax Expense (Benefit) Basis spread on variable rate (as a percent) Debt Instrument, Basis Spread on Variable Rate Other assets Other assets Other Assets Balance, beginning of period Balance, end of period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Preferred stock, issued (in shares) Preferred Stock, Shares Issued Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Designated as Hedging Instrument Designated as Hedging Instrument [Member] Fair Value Hierarchy and NAV [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy and NAV [Axis] Hedging Relationship [Axis] Hedging Relationship [Axis] Adjustments for expected credit losses, PSL Financing Receivable, Allowance For Credit Loss, Purchased Seasoned Loan Financing Receivable, Allowance For Credit Loss, Purchased Seasoned Loan Net Interest Income Net Interest Income [Member] Net interest income. Long-term Purchase Commitment [Table] Long-Term Purchase Commitment [Table] Gross mortgage servicing fees Contractually Specified Servicing Fees, Amount Due in 1 year or less Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Bank premises and equipment Property and equipment Property, Plant and Equipment [Member] Adjustments for expected credit losses, Total Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Loan Purchased Aggregate Fair Value Fair Value, Option, Loans Held as Assets [Abstract] FHLB Advances FHLB Advances [Member] FHLB advances member. Fair value of acquired loans and leases, PCD Financing Receivable, Purchased with Credit Deterioration, Amount at Purchase Price Common Stock, Without Par Value Common Stock, Without Par Value [Member] Common Stock, Without Par Value Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Goodwill acquired Acquisition activity Goodwill, Acquired During Period All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Schedule of Qualified Plan Assets at Fair Value Defined Benefit Plan, Plan Assets, Category [Table Text Block] Other noninterest income Noninterest Income, Other Operating Income Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Loans pledged Security Owned and Pledged as Collateral, Associated Liabilities, Fair Value Net Cash (Used in) Provided by Operating Activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Repayment of short-term FHLB advances Repayments of Short-Term Debt AFS securities and other investments Proceeds from Sale of Debt Securities, Available-for-Sale Available-for-sale debt and other securities (amortized cost of $49,238 and $39,107) Fair Value Fair Value Available-for-sale debt and other securities: Debt Securities, Available-for-Sale, Excluding Accrued Interest Net Interest Income Interest Income (Expense), Operating Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Loans and leases held for sale to portfolio loans and leases Loan, Transfer from Held-for-Sale to Held-in-Portfolio Redemption Period Three Debt Instrument, Redemption, Period Three [Member] Fair value of acquired loans and leases, Total Financing Receivable, Purchased Loans, Fair Value Financing Receivable, Purchased Loans, Fair Value Gross Amount Recognized in the Consolidated Balance Sheets Derivative Liability, Subject to Master Netting Arrangement, before Offset Other noninterest expense Other Noninterest Expense 1 [Member] Other noninterest expense 1 member. Swap Swap Swap [Member] Remainder of 2026 Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year Assets: Business Combination, Recognized Asset Acquired, Asset [Abstract] Full-service banking centers Number Of Banking Center Locations Number Of Banking Center Locations Statement, Equity Components [Axis] Equity Components [Axis] Equity Components [Axis] Year Four Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year Standby Letters of Credit Standby Letters of Credit [Member] Mortgage Backed Securities [Axis] Mortgage Backed Securities [Axis] Mortgage Backed Securities [Axis] Mortgage backed securities. Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Series L Preferred Stock Series L Preferred Stock [Member] Series L Preferred Stock Number of business segments Number of Reportable Segments Variable Interest Entities Variable Interest Entity Disclosure [Text Block] Entity Address, State or Province Entity Address, State or Province Substandard Substandard [Member] Total interest income Interest and Dividend Income, Operating Financial Asset, Aging [Domain] Financial Asset, Aging [Domain] Special mention Special Mention [Member] 2030 Defined Benefit Plan, Expected Future Benefit Payment, Year Four Servicing rights Servicing Asset Consolidate [Domain] Consolidate [Domain] Consolidate [Domain] Loans measured at FV Residential mortgage loans Loans Receivable, Fair Value Disclosure Commercial and industrial Commercial and Industrial Sector [Member] Other consumer loans Other Consumer Loans And Leases [Member] Other consumer loans and leases member. Long-term Purchase Commitment, Category of Item Purchased [Domain] Long-term Purchase Commitment, Category of Item Purchased [Domain] Long-Term Purchase Commitment, Category of Item Purchased [Domain] Individual: Individual [Axis] Credit risk factor Fair value inputs credit risk Fair value inputs credit risk. Financing Receivable, Modified, Past Due Financing Receivable, Modified, Past Due [Table Text Block] Indirect secured consumer loans Indirect Secured Consumer Loan [Member] Indirect Secured Consumer Loan Servicing rights Servicing Asset at Amortized Cost Maximum Exposure Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Other securities Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Amortized Cost Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Repayment of long-term debt Repayments of Long-Term Debt Entity Interactive Data Current Entity Interactive Data Current Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Interest crediting rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Weighted-Average Interest Crediting Rate Financing Receivable, Modifications Financing Receivable, Modified [Line Items] Home equity Home Equity Line of Credit [Member] Funded status Defined Benefit Plan, Funded (Unfunded) Status of Plan Interest Income Interest and Dividend Income, Operating [Abstract] Total noninterest expense Total noninterest expense Noninterest Expense Acquired Comerica Plans Acquired Comerica Plans [Member] Acquired Comerica Plans Payment Delay Payment Deferral [Member] Net Identifiable Assets Acquired, at Fair Value: Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less) [Abstract] Credit Quality and the Allowance for Loan and Lease Losses Allowance for Credit Losses [Text Block] Interest on deposits Interest Expense, Deposits Property, Plant and Equipment, Type [Axis] Long-Lived Tangible Asset [Axis] Noninterest Income Noninterest Income [Abstract] Capital market fees Capital Market Fees [Member] Capital Market Fees Goodwill Business Combination, Goodwill Recognized Business Combination, Goodwill Recognized Outstanding balances on residential mortgage loans sold with representation and warranty provisions SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount Class B, Series A Preferred Stock Class B, Series A Preferred Stock [Member] Class B, Series A Preferred Stock 2028 Defined Benefit Plan, Expected Future Benefit Payment, Year Two Summary of the ALLL and Related Loans and Leases Classified by Portfolio Segment Loan Port folio Table Text Block [Table Text Block] Loan port folio table text block. Interest rate contracts related to MSR portfolio Interest Rate Contracts Related To MSR Portfolio [Member] Interest Rate Contracts Related To MSR Portfolio Common stock, shares issued, not disclosed Common Stock, Shares Issued, Not Disclosed Common Stock, Shares Issued, Not Disclosed Entity Central Index Key Entity Central Index Key PEO Name PEO Name Net gains (losses) recorded in earnings Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 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] Fair Value, Balance Sheet Grouping, Financial Statement Captions Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Loan and Leases Balances by Credit Quality Indicator Financing Receivable Credit Quality Indicators [Table Text Block] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Nonaccrual loans Fair Value Option Loans Held As Assets Amount In Non accrual Status Aggregate Unpaid Principal Fair value option loans held as assets amount in non accrual status aggregate unpaid principal. FRB Loan Federal Reserve Board Loan [Member] Federal Reserve Board Loan Other Comprehensive (Loss) Income, Net of Tax: Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] FTE adjustments FTE Adjustment FTE Adjustment Defined Benefit Plan [Table] Defined Benefit Plan [Table] Unfunded commitments in qualifying LIHTC investments Investment Program, Proportional Amortization Method, Elected, Commitment Noninterest-bearing deposits Noninterest-Bearing Deposit Liabilities Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Nonqualified Plan Nonqualified Plan [Member] Fair value of acquired loans and leases, PSL Financing Receivable, Purchased Seasoned Loans, Amount At Purchase Price Financing Receivable, Purchased Seasoned Loans, Amount At Purchase Price Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Class of Stock [Domain] Class of Stock [Domain] Term Extension and Payment Delay Extended Maturity and Payment Delay [Member] Extended Maturity and Payment Delay Adjustable Adjustable Rate Loans [Member] Derivatives, Fair Value, by Balance Sheet Location [Axis] Statement of Financial Position Location, Balance [Axis] 2029 Finite-Lived Intangible Asset, Expected Amortization, Year Three Qualified Plan Qualified Plan [Member] Gain or losses reclassified from AOCI into earnings associated with the discontinuance of cash flow hedges Other Comprehensive Income (Loss), Cash Flow Hedge, Reclassification for Discontinuance, before Tax Amount of variation margin payment applied to derivative liability contracts Variation Margin Payable, Derivative Gross Carrying Amount Finite-Lived Intangible Assets, Gross Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Entity Address, Address Line One Entity Address, Address Line One Prepayment Speed Assumption, Impact of Adverse Change on Fair Value 50% Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of Other than 10 or 20 Percent Adverse Change in Prepayment Speed Total portfolio loans and leases Financing Receivable, Net, Amount For Amortized Cost Basis Financing Receivable, Net, Amount For Amortized Cost Basis Commercial mortgage and commercial construction Commercial Mortgage And Commercial Construction Loans [Member] Commercial Mortgage And Commercial Construction Loans Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Investment Type Categorization [Member] Investments [Domain] Revolving Loans Converted to Term Loans Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff Financing Receivable Information by Credit Quality Indicator [Axis] Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Servicing Rights [Domain] Servicing Rights domain Member [Domain] Servicing Rights domain Member. Financing Receivable By Credit Quality Indicator [Domain] Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Derivative Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Industry Sector [Axis] Industry Sector [Axis] Commercial mortgage owner-occupied loans Commercial Mortgage Loans Owner Occupied [Member] Commercial mortgage loans owner occupied. Impact of stock transactions under stock compensation plans, net APIC, Share-Based Payment Arrangement, Recognition and Exercise Other Liabilities Other Liabilities [Member] Fair Value as of Grant Date Award Grant Date Fair Value Available-for-sale debt and other securities: Debt Securities, Available-for-Sale, Realized Gain (Loss) [Abstract] Financing Receivable, Impaired Financing Receivable, Impaired [Line Items] Year Five Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year Total Fair Value Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Schedule of Long-Term Debt Instruments Schedule of Long-Term Debt Instruments [Table Text Block] Compensation and benefits Compensation and benefits Labor and Related Expense Schedule of Servicing Assets at Amortized Value [Table] Servicing Asset at Amortized Cost [Table] Non-agency mortgage-backed securities Non-agency commercial mortgage-backed securities Mortgage-Backed Securities, Issued by Private Enterprises [Member] Effect of dilutive stock-based awards (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Net Gains (Losses) Relating to Derivative Instruments Designated as Cash Flow Hedges Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] Entity Listings [Line Items] Entity Listings [Line Items] Document Quarterly Report Document Quarterly Report Less than 12 months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Quantitative Information About Significant Unobservable Level 3 Fair Value Measurement Input, Recurring Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Summary of the Bancorp's Nonperforming Loans and Leases by Class Financing Receivable, Nonaccrual [Table Text Block] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Accrued interest receivables on investment securities Accrued Investment Income Receivable Loans Insured or Guaranteed by Government Authorities [Domain] Loans Insured or Guaranteed by Government Authorities [Domain] Investment Type [Axis] Investment Type [Axis] Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount 2029 Defined Benefit Plan, Expected Future Benefit Payment, Year Three Fair Value Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value [Abstract] Collateral held for derivative assets Derivative Asset, Fair Value of Collateral Non-PEO NEO Non-PEO NEO [Member] Plan assets at fair value Defined Benefit Plan, Plan Assets, Less Accrued Interest Receivable, Amount Defined Benefit Plan, Plan Assets, Less Accrued Interest Receivable, Amount Preferred stock, dividend rate Preferred Stock, Dividend Rate, Percentage Other short-term investments Payments for (Proceeds from) Short-Term Investments OREO Other Real Estate Owned Member [Member] Other real estate owned member. Notional amount of the risk participations agreements Derivative Liability, Notional Amount Other Other Intangible Assets [Member] Unrealized Gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax All Award Types Award Type [Domain] Amount of pre-tax net (losses) gains recognized in OCI Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax Goodwill Goodwill Disclosure [Text Block] Equity Awards Adjustments Equity Awards Adjustments [Member] Unearned income Deferred Credits and Other Liabilities Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Compensation Amount Outstanding Recovery Compensation Amount Series K Preferred Stock Series K Preferred Stock [Member] Series K Preferred Stock Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Commercial mortgage nonowner-occupied loans Commercial Mortgage Loans Non Owner Occupied [Member] Commercial mortgage loans, non owner-Occupied. 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Mortgage Backed Securities [Domain] Mortgage Backed Securities [Domain] Mortgage Backed Securities [Domain] Mortgage backed securities. Escrow deposit Visa Funding Amount Escrow Deposit Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Weighted-average length of payment delay Financing Receivable, Modified, Weighted Average Payment Delay Increase From Modification Financing Receivable, Modified, Weighted Average Payment Delay Increase From Modification Equity securities: Equity Securities, FV-NI, Gain (Loss) [Abstract] Capital contribution to private equity investments Capital Contribution To Private Equity Funds Capital contribution to private equity funds. Past due loans of 90 days or more Fair Value Option Loans Held As Assets 90 Days Or More Past Due Aggregate Unpaid Principal Fair value option loans held as assets 90 days or more past due aggregate unpaid principal. Treasury stock Treasury Stock, Value Private equity, impairment Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] Collateral held for derivative liabilities Derivative Liability, Fair Value of Collateral Schedule of Servicing Assets at Amortized Value Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items] Credit Risk Associated with Commitments Credit Risk Associated With Commitments [Table Text Block] Credit risk associated with commitments table text block. Other comprehensive income (loss), before reclassifications, tax effect Other Comprehensive Income (Loss) before Reclassifications, Tax Fair Value By Liability Class [Axis] Liability Class [Axis] Comerica Incorporated Comerica Incorporated [Member] Comerica Incorporated Solar energy installation loans Financing Receivable, Before Allowance For Credit Losses, Solar Energy Installation Loans Financing Receivable, Before Allowance For Credit Losses, Solar Energy Installation Loans Segments [Domain] Segments [Domain] Damages sought Loss Contingency, Damages Sought, Value Income Statement Location [Axis] Income Statement Location [Axis] Statement of Income Location, Balance [Axis] Assets and Liabilities Related to Non-consolidated VIEs and Maximum Exposure to Losses Non Consolidation Of Variable Interest Entities [Table Text Block] Non consolidation of variable interest entities disclosure text block. Fair value adjustment Assets, Fair Value Adjustment Loans and leases held for sale Business Combination, Recognized Assets Acquired, Loans And Leases, Held For Sale Business combination recognized identifiable assets acquired and liabilities assumed assets loans and leases held for sale. Investment Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Portfolio loans and leases Payments For (Proceeds From) Portfolio Loans And Leases Payments For (Proceeds From) Portfolio Loans And Leases Net change in: Net Change In Investing [Abstract] Net Change In Investing [Abstract] Capital markets fees Capital Markets Fees Capital Markets Fees Fair Value Measurements Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Projected benefit obligation Defined Benefit Plan, Benefit Obligation Balance Sheet Location [Domain] Statement of Financial Position Location, Balance [Domain] Noncredit discount, net, PCD Financing Receivable, Purchased with Credit Deterioration, Discount (Premium) Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] Available-for-sale debt securities AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset Interest Expense Interest Expense, Operating and Nonoperating [Abstract] Senior Notes Senior Notes [Member] AFS securities Payments to Acquire Debt Securities, Available-for-Sale Preferred stock Preferred Stock, Value, Issued Obligations of states and political subdivisions securities US States and Political Subdivisions Debt Securities [Member] Year Two Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year Total liabilities assumed Business Combination, Recognized Liability Assumed, Liability Subordinated Debt Subordinated Debt [Member] Financial Asset, Aging [Axis] Financial Asset, Aging [Axis] All Executive Categories All Executive Categories [Member] Common stock Common Stock, Value, Issued Interest and fees on loans and leases Interest and Fee Income, Loans and Leases Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Total merger-related charges Business Combination, Integration-Related Cost, Expense Realized Gains and Losses Recognized in Income from Investment Securities Realized Gain (Loss) on Investments [Table Text Block] Year One Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff Net cash received from acquisitions Cash Acquired from Acquisition Investments measured at NAV Fair Value Measured at Net Asset Value Per Share [Member] Nonaccrual portfolio loans and leases Nonaccrual Portfolio Loans And Leases [Member] Nonaccrual Portfolio Loans and Leases [Member]. Business Combination [Axis] Business Combination [Axis] Business Combination [Axis] DTCC, restricted stock holdings Depository Trust Clearing Corporation Stock Represents an equity interest in Depository Trust Clearing Corporation. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). Adjustment for expected credit losses, Other Business Combination, Acquired Receivable, Purchased Without Credit Deterioration, Non-Seasoned, Allowance For Credit Losses Business Combination, Acquired Receivable, Purchased Without Credit Deterioration, Non-Seasoned, Allowance For Credit Losses Total payment by all defendants Litigation Settlement Amount Awarded To Other Party Total Litigation settlement amount awarded to other party total. Mortgage loans in process of foreclosure amount Mortgage Loans in Process of Foreclosure, Amount Allowance on PSLs at acquisition Financing Receivable, Excluding Accrued Interest, Purchased Seasoned Loans, Allowance For Credit Loss At Acquisition Date Financing Receivable, Excluding Accrued Interest, Purchased Seasoned Loans, Allowance For Credit Loss At Acquisition Date Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged items Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) Initial amortized cost basis of acquired loans and leases, PSL Financing Receivable, Purchased Seasoned Loan, Initial Amortized Cost Financing Receivable, Purchased Seasoned Loan, Initial Amortized Cost PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Due after 10 years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Carrying amount of the hedged items Hedged Liability, Fair Value Hedge Hedging Designation [Axis] Hedging Designation [Axis] Fair value of risk participation agreements Other Derivatives Not Designated as Hedging Instruments Liabilities at Fair Value Interest on other short-term investments Other Interest and Dividend Income Losses due to claim denials and curtailments Losses Due To Claim Denials And Curtailments Losses due to claim denials and curtailments. Margin account balance held by the brokerage clearing agent Margin Deposit Assets Net Amount Derivative Liability, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Amount of pre-tax net losses reclassified from OCI into net income Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax Derivative Contract [Domain] Derivative Contract Type [Domain] Derivative Contract [Domain] Financing Receivable, Allowance for Credit Loss [Table] Financing Receivable, Allowance for Credit Loss [Table] Due after 10 years Debt Securities, Held-to-Maturity, Amortized Cost Excluding Accrued Interest, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10 Realized losses Debt Securities, Available-for-Sale, Realized Loss Bank premises and equipment to OREO Property And Equipment Transferred To Other Real Estate Owned Property And Equipment Transferred To Other Real Estate Owned All Individuals All Individuals [Member] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Term extension, interest rate reduction and payment delay Extended Maturity, Interest Rate Reduction And Payment Deferral [Member] Extended Maturity, Interest Rate Reduction And Payment Deferral Bank premises and equipment Payments to Acquire Property, Plant, and Equipment Purchases: Payment for Investing Activity [Abstract] Name Forgone Recovery, Individual Name 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] Reclassification out of AOCI Reclassification out of Accumulated Other Comprehensive Income [Member] Fully and unconditionally guaranteed certain long-term borrowing obligations issued by wholly-owned issuing trust entities Borrowings under Guaranteed Investment Agreements Individually evaluated Financing Receivable, Individually Evaluated for Credit Loss Year Five Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff Other short-term investments Other short-term investments Other Short-Term Investments Offsetting Derivative Financial Instruments Schedule of Derivative Instruments [Table Text Block] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Schedule of Finite-Lived Intangible Assets [Table] Intangible Asset, Finite-Lived [Table] Line of Credit Facility Line of Credit Facility [Line Items] Commercial Commercial Portfolio Segment [Member] Customer relationships Customer-Related Intangible Assets [Member] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Risks Inherent in Servicing Assets and Servicing Liabilities, Type [Domain] Risks Inherent in Servicing Assets and Servicing Liabilities, Type [Domain] Fixed-rate Fixed Rate Residential Mortgage [Member] Unaudited pro forma revenue Business Combination, Pro Forma Information, Pro Forma Revenue Credit card Credit Card Receivable [Member] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Title of 12(b) Security Title of 12(b) Security Provision for (benefit from) loan and lease losses Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) Number of merchants requesting exclusion Loss Contingency, Number of Plaintiffs Cash Payments: Income Taxes Paid, Net [Abstract] Equipment expense Equipment Expense Earnings Per Share [Abstract] Earnings Per Share [Abstract] Earnings Per Share [Abstract] Other securities Other Investments and Securities, at Cost Visa Class B shares carryover basis Carryover basis of shares Carryover basis of shares. Proceeds from sales and dividends representing return of equity method investments Proceeds from Equity Method Investment, Distribution, Return of Capital Unfunded commitments, year expected to be funded Investment Program, Proportional Amortization Method, Elected, Commitment, Year to be Paid Asset-backed securities and other debt securities Asset-backed securities and other debt securities Asset-Backed Securities, Securitized Loans and Receivables [Member] Year Three Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff Summary of Short-Term Borrowings Schedule Of Other Short Term Debt [Table Text Block] Schedule of other short term debt text block. Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Financing Receivable, Allowance for Credit Loss [Line Items] Financing Receivable, Allowance for Credit Losses Financing Receivable, Allowance for Credit Loss [Line Items] Award Timing Disclosures [Line Items] Lease pool entities Lease Agreements [Member] Recognized service cost Defined Benefit Plan, Service Cost Fair Value Measurement Frequency [Domain] Measurement Frequency [Domain] Federal Home Loan Bank Advances Federal Home Loan Bank Advances [Member] Other comprehensive income (loss), before reclassifications, net activity Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Change in fair value of hedged long-term debt attributable to the risk being hedged Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge Loan Restructuring Modification [Domain] Loan Restructuring Modification [Domain] Portfolio loans and leases, net Portfolio loans and leases Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss CDC investments CDC investments Fifth Third Community Development Corporation Investments [Member] Fifth third community development corporation investments member. Fixed-Rate 4.00% Senior Notes Due in 2029 Fixed-Rate 4.00 Percent Senior Notes Due in 2029, Loan 1 [Member] Fixed-Rate 4.00 Percent Senior Notes Due in 2029, Loan 1 Residential mortgage loan sales Proceeds from Sale, Loan, Mortgage, Held-for-Sale Net Income Net Income Net income Net Income (Loss) Attributable to Parent Past due loans of 30-89 days Fair Value Option Loans Held As Assets 30-89 Days Past Due Aggregate Unpaid Principal Fair value option loans held as assets 90 days or more past due aggregate unpaid principal. Other short-term investments Business Combination Recognized Asset Acquired, Other Short Term Investments Business combination recognized identifiable assets acquired and liabilities assumed other short term investments. Visa IPO, shares of Visa's Class B common stock received (in shares) Stock Received In Initial Public Offering Shares Stock Received In Initial Public Offering Shares. Portfolio loans and leases Business Combination, Recognized Asset Acquired, Financing Receivable, Gross Business Combination, Recognized Asset Acquired, Financing Receivable, Gross Segment Reporting Information Segment Reporting Information [Line Items] Commercial leases Commercial Leases [Member] Commercial leases. Fixed Rate Reset Non-Cumulative Perpetual Stock, Series B Fixed-Rate Reset Non-Cumulative Perpetual Stock, Series B [Member] Fixed-Rate Reset Non-Cumulative Perpetual Stock, Series B Preferred stock, authorized (in shares) Preferred Stock, Shares Authorized Repurchases of treasury stock and related forward contract Payments for Repurchase of Common Stock Adoption Date Trading Arrangement Adoption Date Financing Receivable, Past Due [Table] Financing Receivable, Past Due [Table] Non-rated Securities Nonrated Securities [Member] Retained earnings Retained Earnings (Accumulated Deficit) Schedule of Net Funded Status Schedule of Net Funded Status [Table Text Block] Residential Mortgage Residential Mortgage Loans Residential Portfolio Segment [Member] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Capital Unit, Class [Domain] Capital Unit, Class [Domain] Forward starting interest rate swap Forward Starting Interest Rate Swap [Member] Forward Starting Interest Rate Swap Due to changes in inputs or assumptions Servicing Asset at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs or Changes in Assumptions HTM securities Payments to Acquire Held-to-Maturity Securities Class of Stock [Axis] Class of Stock [Axis] Cash flow hedge derivatives Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Interest Income (Expense), Operating, Including FTE Adjustments Interest Income (Expense), Operating, Including FTE Adjustments Interest Income (Expense), Operating, Including FTE Adjustments 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] Residential Mortgage and Consumer Consumer And Residential Portfolio Segment [Member] Consumer And Residential Portfolio Segment Interest rate risk factor Fair Value Inputs Interest Rate Risk Factor Fair value inputs interest rate risk factor. Retirement Plan Type [Axis] Retirement Plan Type [Axis] Fair Value Transferor's Interests in Transferred Financial Assets, Fair Value Statement [Table] Statement [Table] Indirect secured consumer loans Financing Receivable, Before Allowance For Credit Losses, Consumer Installments Financing Receivable, Before Allowance For Credit Losses, Consumer Installments Provision for deferred income taxes Deferred Income Tax Expense (Benefit) Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Financing Activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Types of Financial Instruments [Domain] Transfers And Servicing Of Financial Instruments Types Of Financial Instruments 1 [Domain] Transfers and servicing of financial instruments types of financial instruments 1 domain. Available-for-Sale Debt and Other, Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Fiscal Year Maturity [Abstract] OREO and other repossessed property O R E O And Other Repossessed Assets [Member] OREO and Other Repossessed Assets [Member]. Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Equity and trading debt securities Increase (Decrease) in Debt Securities, Trading, and Equity Securities, FV-NI Other securities Debt Securities, Held-to-Maturity, Amortized Cost Excluding Accrued Interest, after Allowance for Credit Loss, Maturity, without Single Maturity Date Reconciliation of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] All Adjustments to Compensation All Adjustments to Compensation [Member] Derivative collateral Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral Contractual Interest Rate Reduction Contractual Interest Rate Reduction [Member] Amendment Flag Amendment Flag Available-for-Sale Debt and Other, Fair Value Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract] Transfers: Transfers and Servicing [Abstract] Interest Income (Expense) Net Interest Income Expense Net [Member] Interest Income Expense Net [Member]. Maximum length of time of hedging exposure Maximum Length of Time Hedged in Interest Rate Cash Flow Hedge Termination Date Trading Arrangement Termination Date General Corporate and Other Corporate And Reconciling Items [Member] Corporate And Reconciling Items Servicing Assets and Servicing Liabilities Risk [Axis] Servicing Assets and Servicing Liabilities Risk [Axis] Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Allowance for loan and lease losses Balance, beginning of period Balance, end of period Total ALLL ALLL Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest Due in 1 year or less Debt Securities, Held-to-Maturity, Amortized Cost Excluding Accrued Interest, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One Leveraged leases Leveraged Leases, Balance Sheet, Investment in Leveraged Leases, Net Receivable [Domain] Receivable [Domain] Average common shares outstanding - basic (in shares) Weighted Average Number of Shares Outstanding, Basic Supplemental Cash Flow Information Cash Flow, Supplemental Disclosures [Text Block] Schedule of Earnings Per Share Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Segment Reporting [Abstract] Segment Reporting [Abstract] Expense related to retirement termination benefit Defined Benefit Plan, Cost of Providing Special and Contractual Termination Benefits Loan and lease expense Operating Lease, Expense Debt Disclosure [Abstract] Defined Benefit Plan, Plan Assets, Category [Axis] Defined Benefit Plan, Plan Assets, Category [Axis] Financial Instrument [Axis] Financial instrument 1 [Axis] Financial instrument 1 axis. Reclassification adjustment, tax effect Reclassification from AOCI, Current Period, Tax Reclassification adjustment, pre-tax activity Reclassification from AOCI, Current Period, before Tax, Attributable to Parent Type Of Asset Measured At Level Three [Axis] Type Of Asset Measured At Level Three Axis [Axis] Type of asset measured at level three axis. Term Extension and Payment Delay Extended Maturity and Payment Deferral [Member] Extended Maturity and Payment Deferral Schedule of Price Risk Derivatives Schedule of Price Risk Derivatives [Table Text Block] Derivative liabilities Offsetting Derivative Liabilities [Abstract] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Consolidated Entities [Axis] Consolidated Entities [Axis] Deposits Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deposits Business combination recognized identifiable assets acquired and liabilities assumed deposits. Net interest income after provision for (benefit from) credit losses Interest Income (Expense), after Provision for Loan Loss, Including FTE Adjustments Interest Income (Expense), after Provision for Loan Loss, Including FTE Adjustments With an ALLL Financing Receivable Nonaccrual With Related Allowance Financing receivable nonaccrual with related allowance. Net realized gains Equity Securities, FV-NI, Realized Gain (Loss) Short positions Noninvestment Assets Less Noninvestment Liabilities Schedule of Merger Related Nonrecurring Charges Business Combination, Merger Related Charges, Nonrecurring [Table Text Block] Business Combination, Merger Related Charges, Nonrecurring Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Dividends paid on common and preferred stock Payments of Dividends Other comprehensive income (loss), tax effect Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Net occupancy expense Net occupancy expense Occupancy, Net Gain resulting from observable price changes Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount Redemption period Debt Instrument, Redemption Period Debt Instrument, Redemption Period Insider Trading Arrangements [Line Items] Prior Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year Equity securities Equity Securities [Member] Current Financial Asset, Not Past Due [Member] Total Liabilities Total Liabilities Liabilities Commercial mortgage loans Commercial Mortgage Loans [Member] Commercial Mortgage Loans Interest rate lock commitments IRLCs, net Interest Rate Lock Commitments [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Fixed-Rate 5.982% Senior Notes Due 2030 Fixed-Rate 5.982 Percent Senior Notes Due 2030 [Member] Fixed-Rate 5.982 Percent Senior Notes Due 2030 Long-term debt Long-term debt assumed Business Combination, Recognized Liability Assumed, Long-Term Debt, Noncurrent Asset-Backed Securities Asset-Backed Securities [Member] Consolidation Items [Axis] Consolidation Items [Axis] Quantitative Information About Significant Unobservable Level 3 Fair Value Measurement Input, Nonrecurring Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques [Table Text Block] Collective Investment Funds Collective Investment Funds [Member] Collective Investment Funds Proceeds from repayments and maturities of HTM securities Proceeds from Maturities, Prepayments and Calls of Held-to-Maturity Securities Available-for-sale debt securities transferred to held-to-maturity securities AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale Transferred to Held-to-Maturity, Parent [Member] AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale Transferred to Held-to-Maturity, Parent Held-to-maturity securities (fair value of $16,341 and $11,404) Amortized Cost Held-to-maturity securities Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss Contract revenue Customer Contracts [Member] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Other borrowed money Other Borrowed Money Other Borrowed Money