50% Of Contract Residual Value 50% Of Vehicle Residual Value [Member] 50% Of Vehicle Residual Value Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization 2029 Debt Instrument, Redemption, Period Four [Member] Schedule of Short-term Debt Schedule of Short-Term Debt [Table Text Block] Liability excluded from amortized cost of hedged asset, portfolio layer method Hedged Asset, Fair Value Hedge, Portfolio Layer Method, Liability Held Against Amortized Cost Of Hedged Asset Hedged Asset, Fair Value Hedge, Portfolio Layer Method, Liability Held Against Amortized Cost Of Hedged Asset Award Timing Predetermined Award Timing Predetermined [Flag] Investment amortization expense recognized as a component of income tax expense Investment Program, Proportional Amortization Method, Applied, Amortization Expense Entity File Number Entity File Number Total credit risk Credit Risk Contract [Member] A Fitch, A Rating [Member] Available-for-sale securities Available For Sale Debt Securities Location [Member] Primary financial statement caption encompassing available for sale debt securities. Net financing revenue and other interest income Net Financing Revenue Total financing revenue and other interest income net of interest expense and depreciation expense on operating lease assets. Tabular List, Table Tabular List [Table Text Block] Credit-Linked Notes Credit-Linked Notes [Member] Credit-Linked Notes Recently Issued Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Schedule of Fair Value, by Balance Sheet Grouping Fair Value, by Balance Sheet Grouping [Table Text Block] Investment program, proportional amortization method, elected, impairment loss Investment Program, Proportional Amortization Method, Elected, Impairment Loss Investment securities Debt Securities [Member] Goodwill [Line Items] Goodwill [Line Items] Measurement Basis [Axis] Measurement Basis [Axis] Adjustment to Compensation: Adjustment to Compensation [Axis] Translation adjustments and net investment hedges Accumulated Foreign Currency Adjustment And Net Gain (Loss) From Investment Hedges, Parent [Member] Accumulated Foreign Currency Adjustment And Net Gain (Loss) From Investment Hedges, Parent Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Brokerage commissions and other revenue Brokerage Commissions and Other [Member] Brokerage Commissions and Other [Member] Revenue from Contracts with Customers Revenue from Contract with Customer [Text Block] Preferred stock dividends paid Payments of Ordinary Dividends, Preferred Stock and Preference Stock Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Recoveries Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Finance receivables and loans, net Financing Receivable, before Allowance for Credit Loss [Abstract] Long-term debt, due within one year, net of original issue discount Long-Term Debt, Current Maturities, Net Of Original Issue Discount Long-Term Debt, Current Maturities, Net Of Original Issue Discount Common equity tier one capital ratio, minimum Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Capital Adequacy, Minimum Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] Accounts Payable and Accrued Liabilities [Abstract] Accounts Payable and Accrued Liabilities [Abstract] Adjustment to Compensation, Amount Adjustment to Compensation Amount Other assets Increase (Decrease) in Other Operating Assets Due after five years through ten years Debt Securities, Held-to-Maturity, Maturity, Rolling after 5 through 10 Years, Weighted Average Yield Employee Stock Option Share-Based Payment Arrangement, Option [Member] Loans held-for-sale Loans, Held-For-Sale [Member] Loans, Held-For-Sale Interest on long-term debt Interest On Long Term Debt [Member] Primary financial statement caption encompassing interest on long-term debt Trial modifications, amount Financing Receivable, Trial Modifications, Amount Financing Receivable, Trial Modifications, Amount Vehicles Property, Plant, and Equipment, Lessor Asset under Operating Lease, before Accumulated Depreciation Common stock dividends 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] Debt Securities, Available-for-Sale [Table] Debt Securities, Available-for-Sale [Table] Insider Trading Policies and Procedures [Line Items] Net change in nonmarketable equity investments Increase (Decrease) In Non Marketable Equity Securities Increase (Decrease) In Non Marketable Equity Securities Common stock, shares authorized (in shares) Common Stock, Shares Authorized Stock issued during period (in shares) Stock Issued During Period, Shares, New Issues Loss Contingency [Abstract] Loss Contingency [Abstract] Fair value, measurements, recurring Fair Value, Recurring [Member] Schedule of Cash Flows with Nonconsolidated Special-Purpose Entities Schedule Of Cash Flow Received And Paid To Nonconsolidated Securitization Entities [Table Text Block] Schedule of cash flow received and paid to securitization entities, asset-backed financings, or other similar transfers of financial assets where the transfer is accounted for as a sale and we have a continuing involvement with the transferred assets (e.g., servicing). Cover [Abstract] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Maximum Maximum [Member] Due after ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Total assets restricted as collateral Debt Instrument, Collateral Amount Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Included in earnings Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) 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] Financing Receivable, Credit Quality Indicator [Table] Preferred stock dividends — Series B Series B Preferred Stock Series B Preferred Stock [Member] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount 2026 Debt Instrument, Redemption, Period One [Member] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Interest on cash and cash equivalents Interest Income, Deposits with Financial Institutions Payment extensions, number of months extended/deferred Financing Receivable, Modified, Weighted Average Term Increase from Modification Income (loss) from continuing operations before income tax expense (benefit) Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Tier one leverage to adjusted quarterly average assets, ratio Banking Regulation, Tier 1 Leverage Capital Ratio, Actual Revolving loans converted to term Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Recourse Status [Domain] Recourse Status [Domain] Hedged liability, discontinued fair value hedge, cumulative increase (decrease) Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Operating Segments Operating Segments [Member] Operating lease remaining lease term Lessee, Operating Lease, Remaining Lease Term Included in OCI Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Total interest expense Total interest expense Interest Expense, Operating Net income (loss) from continuing operations Net income (loss) from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Offsetting Assets and Liabilities Offsetting Assets And Liabilities [Text Block] Offsetting Assets and Liabilities [Text Block] Entity Address, Address Description Entity Address, Address Description Corporate and Other Corporate and Other Corporate, Reconciling Items And Eliminations [Member] Corporate, Reconciling Items And Eliminations Document Fiscal Period Focus Document Fiscal Period Focus Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Award Timing Method Award Timing Method [Text Block] Net income (loss) from continuing operations (in dollars per share) Net income (loss) from continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Basic Share Available-for-sale securities, amortized cost Amortized cost basis Amortized cost 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] Cash collateral received from counterparties Cash Collateral Received From Counterparties, Excluding Collateral Associated With Repurchase Agreements Cash Collateral Received From Counterparties, Excluding Collateral Associated With Repurchase Agreements Translation adjustments Accumulated Foreign Currency Adjustment Attributable to Parent [Member] 2029 Sales-Type and Direct Financing Leases, Payment to be Received, Year Three Trading Symbol Trading Symbol 2030 Lessee, Operating Lease, Liability, to be Paid, Year Four Total sales and transfers Financing Receivable, Sale and Reclassification to Held-for-Sale Finance receivables and loans, net Finance receivables and Loans, net [Member] Primary financial statement caption encompassing finance receivables and loans. Yield Debt Securities Held To Maturity Excluding Accrued Interest After Allowance For Credit Loss, Yield [Abstract] Debt Securities Held To Maturity Excluding Accrued Interest After Allowance For Credit Loss, Yield Interest on long-term debt Interest Expense, Long-Term Debt Due in one year or less Debt Securities, Held-to-Maturity, Maturity, Rolling within One Year, Weighted Average Yield Accrued expenses and other liabilities Total accrued expenses and other liabilities Accrued Liabilities and Other Liabilities Entity Address, City or Town Entity Address, City or Town Short-term Debt, Type [Domain] Short-Term Debt, Type [Domain] Qualitative and Quantitative Information, Transferor's Continuing Involvement in Transferred Financial Assets, Transfer or Transferee [Domain] Qualitative and Quantitative Information, Transferor's Continuing Involvement in Transferred Financial Assets, Transfer or Transferee [Domain] Schedule of Purchases of Financing Receivables and Loans Schedule Of Purchases Of Financing Receivables And Loans [Table Text Block] [Table Text Block] for Schedule of Purchases of Financing Receivables and Loans [Table] FHLB/FRB stock Federal Home Loan Bank Stock and Federal Reserve Bank Stock Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] Effect of exchange-rate changes on cash and cash equivalents and restricted cash Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Net change in short-term borrowings Proceeds from (Repayments of) Short-Term Debt Income Statement Location [Domain] Statement of Income Location, Balance [Domain] Certificates of deposit, in excess of $250,000 federal insurance limits Time Deposits, at or Above FDIC Insurance Limit Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Schedule of Held to Maturity Debt Securities by Credit Quality Debt Securities, Held-to-Maturity, Credit Quality Indicator [Table Text Block] Interest on short-term borrowings Interest Expense, Short-Term Borrowings Entity Emerging Growth Company Entity Emerging Growth Company 2029 Long-Term Debt, Maturity, Year Three Schedule of Depreciation Expense on Operating Lease Assets Depreciation Expense On Operating Lease Assets [Table Text Block] Depreciation expense on operating lease assets [Table Text Block] Common equity tier one capital ratio Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Actual Derivative liabilities, gross amounts not offset on the Condensed Consolidated Balance Sheet, 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] Total loss on cash flow hedging relationships Derivative, Gain (Loss) on Derivative, Net Dividend rate, basis spread on variable rate Preferred Stock, Dividend Rate, Basis Spread, Variable Rate Preferred Stock, Dividend Rate, Basis Spread, Variable Rate Restricted cash and cash equivalents Restricted Cash and Cash Equivalent Interest and dividends on investment securities and other earning assets Interest And Dividends On Investment Securities And Other Earning Assets [Member] Primary financial statement caption encompassing interest and dividends on investment securities and other earning assets. Purchases and originations Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases Employee compensation and benefits Accrued Employee Benefits Schedule of Equity Securities without Readily Determinable Fair Value Equity Securities without Readily Determinable Fair Value [Table Text Block] Total other revenue Other revenue Noninterest Income Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Original issue discount Original Issue Discount [Member] original issue discount [Member] 2026 Lessor, Operating Lease, Payment to be Received, Remainder of Fiscal Year AAA Fitch, AAA Rating [Member] (Loss) gain on mortgage and automotive loans, net Loss (gain) on mortgage and automotive loans, net Gain (Loss) on Sales of Loans, Net Other operating expenses Other Noninterest Expense [Abstract] Other Noninterest Expense Schedule of Investment Portfolio Marketable Securities [Table Text Block] Schedule of Pledged Assets related to Secured Borrowings [Table] Schedule Of Pledged Assets Related To Secured Borrowings [Table] Schedule of Pledged Assets related to Secured Borrowings [Table] Gross unrealized losses Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss Other assets Other Assets, Fair Value Disclosure Percentage of interest-bearing domestic deposits to deposits, brokered Percentage of Interest-Bearing Domestic Deposits to Deposits, Brokered Finance Receivables and Loans, Net Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Noninterest expense Noninterest Expense [Abstract] Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Noninterest-bearing Cash and Due from Banks Tax credits and other tax benefits from proportional amortization investments Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization Expense Class of Financing Receivable [Domain] Class of Financing Receivable [Domain] Accelerated Share Repurchases [Table] Accelerated Share Repurchases [Table] Transfer of Financial Assets Accounted for as Sales [Table] Transfer of Financial Assets Accounted for as Sales [Table] 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] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Pledged Status [Domain] Pledged Status [Domain] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Interest and dividends on investment securities and other earning assets Interest and dividends on investment securities Interest and Dividend Income, Securities, Operating Income tax expense (benefit) from continuing operations Income tax (benefit) expense from continuing operations Income Tax Expense (Benefit) Other assets Total other assets Other Assets Fair value at beginning of the period Fair value at ending of the period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Premiums receivable and other insurance assets Premiums receivable and other insurance assets Premiums receivable and other insurance assets include deferred policy acquisition costs, reinsurance recoverable on paid and unpaid losses, premiums receivable, and prepaid reinsurance premiums. Number of shares issued (in shares) Preferred Stock, Shares Issued Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Total derivatives designated as accounting hedges Designated as Hedging Instrument [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Hedging Relationship [Axis] Hedging Relationship [Axis] Offsetting [Abstract] Offsetting [Abstract] Property and equipment at cost Property, Plant and Equipment, Gross Customer rewards expense Customer Rewards Expense Customer Rewards Expense Federal Home Loan Bank Branch [Domain] Federal Home Loan Bank Branch [Domain] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Dividends declared (in dollars per share) Dividends Payable, Amount Per Share 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] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Preferred stock dividends Preferred Stock Dividends, Income Statement Impact Depreciation expense on operating lease assets (excluding remarketing losses) Depreciation Expense On Operating Lease Assets Depreciation expense on operating lease assets (excluding remarketing gains). Other income, net of losses Total other income, net of losses Noninterest Income, Other Operating Income Securities with the right to sell or pledge Security Owned and Pledged as Collateral, Associated Liabilities, Fair Value Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation 2026, net of original issue discount Long Term Debt, Maturity, Net Of Original Issue Discount, Remainder Of Fiscal Year Long Term Debt, Maturity, Net Of Original Issue Discount, Remainder Of Fiscal Year Proceeds from sales of available-for-sale securities Proceeds from Sale of Debt Securities, Available-for-Sale Available-for-sale securities (amortized cost basis of $25,974 and $25,825) Fair value Total available-for-sale securities Total available-for-sale securities Debt Securities, Available-for-Sale, Excluding Accrued Interest Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Subsequent event Subsequent Event [Member] Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Tier one capital to risk-weighted assets, amount Banking Regulation, Tier 1 Risk-Based Capital, Actual Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] 2028 Debt Instrument, Redemption, Period Three [Member] Derivative liabilities, gross amounts of recognized assets/liabilities Derivative Liability, Subject to Master Netting Arrangement, before Offset Repurchase Agreements and Similar Transactions, Maturity Periods [Axis] Repurchase Agreements and Similar Transactions, Maturity Periods [Axis] Remarketing fee income Remarketing Activities [Member] Remarketing Activities [Member] Provision for credit losses Provision for credit losses Financing Receivable And Off Balance Sheet Credit Loss Expense (Reversal), Excluding Interest Financing Receivable And Off Balance Sheet Credit Loss Expense (Reversal), Excluding Interest Direct financing lease, interest income Direct Financing Lease, Interest Income Equity Components [Axis] Equity Components [Axis] Year four, originated, three years before current fiscal year Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year Held-to-maturity securities AOCI, Accumulated Gain (Loss), Debt Securities, Held-To-Maturity, Parent [Member] AOCI, Accumulated Gain (Loss), Debt Securities, Held-To-Maturity, Parent Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Total liabilities, gross amounts not offset on the Condensed Consolidated Balance Sheet, financial instruments Derivative Liability, Security Sold under Agreement to Repurchase, and Security Loaned, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset Number of reportable segments Number of Reportable Segments Commercial real estate Commercial Real Estate [Member] Insurance losses and loss adjustment expenses Total net insurance losses and loss adjustment expenses incurred Policyholder Benefits and Claims Incurred, Net Securitizations and Variable Interest Entities Variable Interest Entity Disclosure [Text Block] Entity Address, State or Province Entity Address, State or Province Substandard Substandard [Member] Special mention Special Mention [Member] Financial Asset, Period Past Due [Domain] Financial Asset, Aging [Domain] Interest-only mortgage loans Held For Investment Mortgage Finance Receivables Interest Only Mortgage Loans Held for investment mortgage finance receivables interest only mortgage loans. Individual: Individual [Axis] Common stock dividends paid Payments of Ordinary Dividends, Common Stock Other revenue Other revenue [Abstract] Other revenue [Abstract] Debt instrument, reference portfolio amount Debt Instrument, Reference Portfolio Amount Debt Instrument, Reference Portfolio Amount Maximum exposure to loss in nonconsolidated VIEs Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Principal forgiveness Principal Forgiveness [Member] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Contingencies and Other Risks Contingencies Disclosure [Text Block] Repayments of long-term debt Repayments of Long-Term Debt Entity Interactive Data Current Entity Interactive Data Current Schedule of Net Investment Hedges in Accumulated Other Comprehensive Income (Loss) Schedule of Net Investment Hedges in Accumulated Other Comprehensive Income (Loss) [Table Text Block] Financing Receivable, Troubled Debt Restructuring Financing Receivable, Modified [Line Items] Taxable dividends Dividend Income, Securities, Operating, Taxable Lease extension, maximum Lessee, Operating Lease, Lease Extension, Maximum Lessee, Operating Lease, Lease Extension, Maximum Total noninterest expense Noninterest Expense Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Payment deferrals Payment Deferral [Member] Less: Reinsurance recoverable Plus: Reinsurance recoverable Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments Interest on deposits Interest Expense, Deposits Property, Plant and Equipment, Type [Axis] Long-Lived Tangible Asset [Axis] Schedule of Lessor, Operating Lease, Payments to be Received, Maturity Lessor, Operating Lease, Payment to be Received, Maturity [Table Text Block] Other assets Other Assets, Miscellaneous Series D Preferred Stock Series D Preferred Stock [Member] Payment extensions, initial term Financing Receivable, Modified, Weighted Average Term, Before Modification Financing Receivable, Modified, Weighted Average Term, Before Modification Entity Central Index Key Entity Central Index Key PEO Name PEO Name Schedule of Maturities of Long-term Debt Schedule of Maturities of Long-Term Debt [Table Text Block] Total net revenue Revenues Direct financing lease, net investment in lease Direct Financing Lease, Net Investment in Lease, Excluding Accrued Interest, before Allowance for Credit Loss 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 [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Schedule of Financing Receivable Credit Quality Indicators Financing Receivable Credit Quality Indicators [Table Text Block] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Fair value at beginning of the period Fair value at ending of the period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Unfunded commitments for proportional amortization investments Unfunded commitments for proportional amortization investments Investment Program, Proportional Amortization Method, Elected, Commitment Write-downs from transfers to held-for-sale Financing Receivable, Excluding Accrued Interest, Transfer out, Allowance for Credit Loss, Expense Reversal 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, Rolling after One through Five Years Noninterest-bearing Noninterest-bearing deposits Noninterest-Bearing Deposit Liabilities Series C Preferred Stock, Prior To May 15, 2028 Series C Preferred Stock, Prior To May 15, 2028 [Member] Series C Preferred Stock, Prior To May 15, 2028 Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Other Operating Cost and Expense, by Component Schedule of Other Operating Cost and Expense, by Component [Table Text Block] Schedule of Derivative Instruments in Statement of Financial Position Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Tier one capital to risk-weighted assets, required minimum Banking Regulation, Tier 1 Risk-Based Capital Ratio, Capital Adequacy, Minimum Class of Stock [Domain] Class of Stock [Domain] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Hedged asset, fair value hedge, cumulative increase (decrease) Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items] Derecognized Assets, Securitized or Asset-Backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items] Long-term debt, due after one year Long-Term Debt, Excluding Current Maturities Balance Sheet Location [Axis] Statement of Financial Position Location, Balance [Axis] 2031 and thereafter Debt Instrument, Redemption, Period Six [Member] Debt Instrument, Redemption, Period Six [Member] Gross intangible assets 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 Entity Address, Address Line Two Entity Address, Address Line Two Net investment hedges Accumulated Net Gain (Loss) from Investment Hedges, Parent [Member] Accumulated Net Gain (Loss) from Investment Hedges, Parent Accumulated other comprehensive loss Accumulated other comprehensive loss AOCI Attributable to Parent [Member] Revolving loans converted to term Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities Disclosure [Text Block] Preferred Stock Preferred Stock [Text Block] Schedule of Preferred Stock Schedule of Stock by Class [Table Text Block] Fair Value as of Grant Date Award Grant Date Fair Value Ally Bank Ally Bank [Member] Ally Bank [Member] Due in one year or less Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Rolling within One Year Year five, originated, four years before current fiscal year Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year Schedule of Long-term Debt Schedule of Long-Term Debt Instruments [Table Text Block] Compensation and benefits expense Labor and Related Expense Derivative Instruments and Hedging Activities Disclosures [Table] Derivative Instruments and Hedging Activities Disclosures [Table] Assets sold to nonconsolidated VIEs Continuing Involvement with Transferred Financial Assets, Principal Amount Outstanding Tier one leverage ratio, minimum Banking Regulation, Tier 1 Leverage Capital Ratio, Capital Adequacy, Minimum Total assets, gross amounts offset on the Condensed Consolidated Balance Sheet Derivative Asset, Security Purchased under Agreement to Resell, and Security Borrowed, Subject to Master Netting Arrangement, Liability Offset Document Quarterly Report Document Quarterly Report Fair value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Tier one capital to risk-weighted assets, ratio Banking Regulation, Tier 1 Risk-Based Capital Ratio, Actual Deposit Liabilities Deposit Liabilities Disclosures [Text Block] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Schedule of Finance Lease, Liability, Maturity Sales-Type and Direct Financing Leases, Payment to be Received, Maturity [Table Text Block] Schedule of Financing Receivables, Nonaccrual Status 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] 2028 Lessee, Operating Lease, Liability, to be Paid, Year Two Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract] Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract] Other income, net of losses Other Income [Member] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount 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] Non-PEO NEO Non-PEO NEO [Member] Servicing fees Cash Flows Between Transferor and Transferee, Servicing Fees Dividend/coupon rate Preferred Stock, Dividend Rate, Percentage Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Gross unrealized gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Late charges and other administrative fees Late Charges And Other Administrative Fees Late Charges And Other Administrative Fees Schedule of Offsetting Assets Offsetting Assets [Table Text Block] All Award Types Award Type [Domain] Gain recognized in other comprehensive income Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax 2027 Lessee, Operating Lease, Liability, to be Paid, Year One Equity Awards Adjustments Equity Awards Adjustments [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Other, net Other Income Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Compensation Amount Outstanding Recovery Compensation Amount Derivative liabilities, net of derivative assets Derivative Financial Instruments, Liabilities [Member] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Shares intended to be redeemed as percentage of issued and outstanding shares Preferred Stock, Number Of Shares Intended To Be Redeemed, Percentage Of Issued And Outstanding Shares Preferred Stock, Number Of Shares Intended To Be Redeemed, Percentage Of Issued And Outstanding Shares Schedule of Liability for Unpaid Claims and Claims Adjustment Expense and Rollforward of Our Reserves for Insurance Losses and Loss Adjustment Expenses Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block] Foreign exchange Foreign Exchange Contract [Member] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Estimated fair value Estimate of Fair Value Measurement [Member] Unearned revenue, revenue recognized Contract with Customer, Liability, Revenue Recognized Repossessed and foreclosed assets Repossessed And Foreclosed Assets [Member] Repossessed And Foreclosed Assets [Member] Schedule of Investments [Line Items] Schedule of Investments [Line Items] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Due after one year through five years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Other Assets Other Assets Disclosure [Text Block] Hedged available-for-sale securities Debt Securities, Available-For-Sale [Member] Debt Securities, Available-For-Sale Total purchases of finance receivables and loans Financing Receivable, Purchase Financing Receivable, Past Due [Line Items] Financing Receivable, Past Due [Line Items] 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 Deposited securities Deposit Assets Derivative liabilities, gross amounts not offset on the Condensed Consolidated Balance Sheet, financial instruments Derivative Liability, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset Whole-loan sales Whole-Loan Sales [Member] Whole-Loan Sales Proportional amortization investments Investment, Proportional Amortization Method, Elected, Amount Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Number of shares intended to be redeemed (in shares) Preferred Stock, Number Of Shares Intended To Be Redeemed Preferred Stock, Number Of Shares Intended To Be Redeemed Hedged Liability, Statement of Financial Position [Extensible Enumeration] Hedged Liability, Statement of Financial Position [Extensible Enumeration] 2027 Long-Term Debt, Maturity, Year One Cash paid for Interest Paid, Including Capitalized Interest, Operating and Investing Activities [Abstract] Financial Instruments [Domain] Financial Instruments [Domain] Purchases and originations Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Included in 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Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Derivative contracts in a payable position Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement Total liabilities, net amounts of assets/liabilities presented on the Condensed Consolidated Balance Sheet Derivative Liability, Security Sold under Agreement to Repurchase, and Security Loaned, Subject to Master Netting Arrangement, after Offset Derivative liabilities, net amounts of assets/liabilities presented on the Condensed Consolidated Balance Sheet Derivative Liability, Subject to Master Netting Arrangement, after Offset Schedule of Investment Securities, Major Types of Debt and Equity Securities [Axis] Financial Instrument [Axis] Financial Instrument [Axis] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Executive Category: Executive Category [Axis] Forwards Foreign Exchange Forward [Member] Unrealized loss Debt 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Total other operating expenses Other Noninterest Expense Cash collateral placed with counterparties Cash Collateral Placed With Counterparties Cash Collateral Placed With Counterparties Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Loan Restructuring Modification [Axis] Loan Restructuring Modification [Axis] Pass Pass [Member] Interest rate Interest Rate Contract [Member] Total Debt Securities, Available-for-Sale, Excluding Accrued Interest, Yield Debt Securities, Available-for-Sale, Excluding Accrued Interest, Yield Cash proceeds from transfers completed during the period Cash Flows Between Transferor and Transferee, Proceeds from New Transfers Schedule of Fair Value, Assets and Liabilities Measured on a Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Cash and cash equivalents Cash and Cash Equivalents [Abstract] Antidilutive securities excluded from computation of earnings per share, amount (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Schedule of Held-to-maturity Securities [Line Items] Schedule of Held-to-Maturity Securities [Line Items] 2028 Long-Term Debt, Maturity, Year Two Federal Home Loan Bank Federal Home Loan Bank, Advance, Maturity, Year One Schedule of Past Due Financing Receivables Financing Receivable, Past Due [Table Text Block] Interest-bearing Interest-Bearing Deposit Liabilities Leasing Lessee, Operating Leases [Text Block] Net cash provided by financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Measure: Measure [Axis] Property, Plant and Equipment, Type [Domain] Long-Lived Tangible Asset [Domain] Debt securities, available-for-sale, accrued interest, after allowance for credit loss, statement of financial position [extensible enumeration] Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Interest rate concessions, revised rate Financing Receivable, Modified, Weighted Average Interest Rate, Revised Rate Financing Receivable, Modified, Weighted Average Interest Rate, Revised Rate Residual Value Of Leased Asset [Domain] Residual Value Of Leased Asset [Domain] Residual Value Of Leased Asset [Domain] Consumer Consumer Portfolio Segment [Member] Schedule of Reclassification Out of Accumulated Other Comprehensive Loss Reclassification out of Accumulated Other 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Operating Expenses [Abstract] Operating Expenses [Abstract] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, by Asset Class [Domain] Asset Class [Domain] Included in earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Total assets, gross amounts not offset on the Condensed Consolidated Balance Sheet, collateral Derivative Asset, Security Purchased under Agreement to Resell, and Security Borrowed, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset Statement [Line Items] Statement [Line Items] Hedged asset, fair value hedge Hedged Asset, Fair Value Hedge Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Total cash and cash equivalents Cash and cash equivalents on the Condensed Consolidated Balance Sheet Cash and Cash Equivalent Subsequent Event [Line Items] Subsequent Event [Line Items] Deferred income taxes Increase (Decrease) in Deferred Income Taxes Issuances Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances Brokered deposits Interest-Bearing Domestic Deposit, Brokered Debt securities, held-to-maturity, accrued interest receivable Debt Securities, Held-to-Maturity, Accrued Interest, before Allowance for Credit Loss Net (decrease) increase in cash and cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Statistical Measurement [Domain] Statistical Measurement [Domain] Schedule of Other Income, by Component Schedule of Other Nonoperating Income, by Component [Table Text Block] Prior years Prior Year Claims and Claims Adjustment Expense 2026 Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Financing receivable, nonaccrual, interest income Financing Receivable, Nonaccrual, Interest Income Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Common stock and paid-in capital ($0.01 par value, shares authorized 1,100,000,000; issued 522,896,204 and 520,355,804; and outstanding 307,407,671 and 308,492,929) Common Stocks, Including Additional Paid in Capital Fair Value by Asset Class [Axis] Asset Class [Axis] Swaps Interest Rate Swap [Member] Cash paid for amounts included in the measurement of lease liabilities Cash Paid For Amounts Included In The Measurement Of Lease Liabilities Cash Paid For Amounts Included In The Measurement Of Lease Liabilities Included in OCI Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Originations and repayments of finance receivables and loans initially held-for-investment and other, net Originations And Repayments Of Loans Held-For-Investment And Other Originations And Repayments Of Loans Held-For-Investment And Other Income from equity-method investments Income (Loss) from Equity Method Investments Other Income, Net of Losses Other Income and Other Expense Disclosure [Text Block] Leases [Abstract] Leases [Abstract] Unearned insurance premiums and service revenue Unearned Premiums Basic earnings per common share Earnings Per Share, Basic [Abstract] 2030 Lessor, Operating Lease, Payment to be Received, Year Four Off-balance-sheet securitization entities Off-Balance-Sheet Securitization Entities [Member] Off-Balance-Sheet Securitization Entities Pledged Status [Axis] Pledged Status [Axis] Gross unrealized losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Net income (loss) (in dollars per share) Earnings Per Share, Basic Gain recognized in other comprehensive income Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax Liabilities Liabilities, Fair Value Disclosure [Abstract] Schedule of Segment Reporting Information, by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Short-term borrowings Total short-term borrowings Short-Term Debt Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Axis] Gross unrealized gains Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain Unearned revenue, remaining performance obligation, amount Revenue, Remaining Performance Obligation, Amount Other Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Other Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Other Included in earnings Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) Schedule of Fair Value Measurements - Nonrecurring Basis Fair Value Measurements, Nonrecurring [Table Text Block] Charge-offs Total Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff Technology and communications Communications and Information Technology Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Taxable interest Interest Income, Securities, Operating, Taxable On‑balance sheet variable interest entities Variable Interest Entity, Primary Beneficiary [Member] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Accounts and Financing Receivables [Table] Schedule of Available-for-Sale Securities in Unrealized Loss Position Schedule Of Available-For-Sale Securities In Unrealized Loss Position [Table Text Block] Schedule Of Available-For-Sale Securities In Unrealized Loss Position Cash collateral placed Securities Sold under Agreements to Repurchase, Fair Value of Collateral Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Net unrealized losses arising during the period, net of tax OCI, before Reclassifications, Net of Tax, Attributable to Parent Hedging Designation [Domain] Hedging Designation [Domain] Purchases of operating lease assets Payments to Acquire Lease Receivables Loans held-for-sale, net Financing Receivable, Held-for-Sale, Not Part of Disposal Group, after Valuation Allowance Total liabilities and equity Liabilities and Equity Derivative Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location, by Derivative Instrument Risk [Table] Derivative Instruments, Gain (Loss) [Table] Residual value of leased asset Operating Lease, Residual Value of Leased Asset Other Nonoperating Income (Expense) [Abstract] Other Nonoperating Income (Expense) [Abstract] Reclassification from AOCI, net of tax Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Discontinued hedge Discontinued Hedge [Member] Discontinued Hedge [Member] Remarketing losses, net Remarketing losses, net Remarketing Gains (Losses), Net Remarketing Gains (Losses), Net Amount Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss [Abstract] Due after ten years Debt Securities, Available-for-Sale, Maturity, Rolling after 10 Years, Weighted Average Yield Securities sold under agreements to repurchase, gross amounts offset on the Condensed Consolidated Balance Sheet - gross amounts offset on the consolidated balance sheet Security Sold under Agreement to Repurchase, Subject to Master Netting Arrangement, Asset Offset Schedule of Lessee, Operating Lease, Liability, Maturity Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Treasury stock Treasury Stock, Common [Member] Year one, originated, current fiscal year Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year Pay vs Performance Disclosure [Line Items] 2031 and thereafter Long-Term ​Debt​, Maturity, After​ Year ​Four Long-Term ​Debt​, Maturity, After​ Year ​Four Tier one leverage to adjusted quarterly average assets, well-capitalized minimum Banking Regulation, Tier 1 Leverage Capital Ratio, Well Capitalized, Minimum Total lease liability Operating lease liabilities Operating Lease, Liability Total lease payments from operating leases Lessor, Operating Lease, Payment to be Received 90 or more days past due Financial Asset, Equal to or Greater than 90 Days Past Due [Member] Liquidation preference (in dollars per share) Preferred Stock, Liquidation Preference Per Share Liabilities Liabilities [Abstract] Amortized cost of loans redefaulted Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default Net charge-offs Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff (Recovery) Consumer automotive Automobile Loan [Member] 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] Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period [Domain] Goodwill impairment Goodwill impairment Goodwill impairment Goodwill impairment Goodwill, Impairment Loss Change in unrealized gain (loss) on hedged item in fair value hedge Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge Regulatory Capital and Other Regulatory Matters Regulatory Capital Requirements under Banking Regulations [Text Block] Federal Home Loan Bank of Pittsburgh Federal Home Loan Bank of Pittsburgh [Member] 2031 and thereafter Sales-Type And Direct Financing Leases, Payment To Be Received, After Year Four Sales-Type And Direct Financing Leases, Payment To Be Received, After Year Four Schedule of Variable Interest Entities [Table] Variable Interest Entity [Table] Long-term debt, due within one year Long-Term Debt, Current Maturities Year three, originated, two years before current fiscal year Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount 2029 Lessee, Operating Lease, Liability, to be Paid, Year Three More than five years before current fiscal year, writeoff Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff Tier one capital to risk-weighted assets, well-capitalized minimum Banking Regulation, Tier 1 Risk-Based Capital Ratio, Well Capitalized, Minimum Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Disposal Group Name [Domain] Disposal Group Name [Domain] Name Measure Name Due in one year or less Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Issuances Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances Secured debt Secured Debt [Member] Other comprehensive income (loss), before tax Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent Net increase (decrease) in deposits Increase (Decrease) in Deposits Proceeds from repayments of available-for-sale securities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Class of Stock [Line Items] Class of Stock [Line Items] Remarketing fees Remarketing Fees Remarketing fees. Unsecured Unsecured Debt [Member] Accumulated depreciation Property, Plant, and Equipment, Lessor Asset under Operating Lease, Accumulated Depreciation Long-term debt Non-recourse debt Total long-term debt Long-Term Debt Legal Entity [Axis] Legal Entity [Axis] Total assets Carrying value of total assets Total assets Assets Financing Receivable, Credit Quality Indicator [Line Items] Financing Receivable, Credit Quality Indicator [Line Items] Income Taxes Income Tax, Policy [Policy Text Block] Operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Series B Preferred Stock, On And After May 15, 2026 Series B Preferred Stock, On And After May 15, 2026 [Member] Series B Preferred Stock, On And After May 15, 2026 Other Segment Reporting, Other Segment Item, Amount Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, after Amortization, Statement of Income or Comprehensive Income [Extensible Enumeration] Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, after Amortization, Statement of Income or Comprehensive Income [Extensible Enumeration] Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract] Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract] Stephanie N. Richard [Member] Stephanie N. Richard Proceeds from sales and repayments of loans held-for-sale Proceeds from Sale and Collection, Loan, Held-for-Sale Held-to-maturity securities Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract] Assets Assets, Fair Value Disclosure [Abstract] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Derivative assets, gross amounts not offset on the Condensed Consolidated Balance Sheet, financial instruments Derivative Asset, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset Capital to risk-weighted assets, required minimum Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum Held-to-maturity securities, fair value Fair value Debt Securities, Held-to-Maturity, Fair Value Cash dividends declared per common share (in dollars per share) Common Stock, Dividends, Per Share, Declared Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Capitalized contract cost, net Capitalized Contract Cost, Net Right-of-use asset obtained in exchange for operating lease liability Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Debt Securities [Line Items] Debt Securities, Available-for-Sale [Line Items] Level 2 Fair Value, Inputs, Level 2 [Member] Equity-method investments Equity Method Investments Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Business Combination [Domain] Business Combination [Domain] Gain on mortgage and automotive loans, net Gain (Loss) on Mortgage and Automotive Loans [Member] Gain (Loss) on Mortgage and Automotive Loans [Member] Investment in any one industry did not exceed percentage Equity Investment In Any One Industry Did Not Exceed Percentage Equity Investment In Any One Industry Did Not Exceed Percentage Asset Pledged as Collateral Asset Pledged as Collateral [Member] Ally Financial Inc Ally Financial Inc [Member] Ally Financial Inc. PEO PEO [Member] Transfers into Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Tier one leverage to adjusted quarterly average assets, amount Banking Regulation, Tier 1 Leverage Capital, Actual Schedule of Investments Classified by Contractual Maturity Date Investments Classified by Contractual Maturity Date [Table Text Block] Hedged asset, discontinued fair value hedge, cumulative increase (decrease) Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) Noncash items Noncash Investing and Financing Items [Abstract] Net change in Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Common equity tier one capital Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Actual Schedule of Activity in Proportional Amortization Investment Investment Program, Proportional Amortization Method [Table Text Block] 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Per Diluted Share 2029 Lessor, Operating Lease, Payment to be Received, Year Three Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Total liabilities Liabilities, Fair Value Disclosure Notional amount Derivative, Notional Amount Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Revolving loans Financing Receivable, Excluding Accrued Interest, Revolving Total undiscounted cash flows Sales-Type and Direct Financing Leases, Payment to be Received City Area Code City Area Code Schedule of Allowance for Credit Losses on Financing Receivables Financing Receivable, Allowance for Credit Loss [Table Text Block] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Pledged assets for Federal Home Loan Bank Pledged assets for Federal Home Loan Bank [Member] Pledged assets for Federal Home Loan Bank [Member] Securities sold under agreements to repurchase, net amount Security Sold under Agreement to Repurchase, Subject to Master Netting Arrangement, after Offset and Deduction Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements Investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Series B Preferred Stock, Prior To May 15, 2026 Series B Preferred Stock, Prior To May 15, 2026 [Member] Series B Preferred Stock, Prior To May 15, 2026 Total assets, gross amounts of recognized assets/liabilities Derivative Asset, Security Purchased under Agreement to Resell, and Security Borrowed, Subject to Master Netting Arrangement, before Offset Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] Accrued interest, fees, and rent receivables Interest Receivable Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Cash Flows [Extensible Enumeration] Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Cash Flows [Extensible Enumeration] Total lease expense, net Lease, Cost Schedule of Sales of Financing Receivables and Loans Schedule Of Sales Of Financing Receivables And Loans Table Text Block [Table Text Block] Schedule Of Sales Of Financing Receivables And Loans Table Text Block Cash flow hedging Cash Flow Hedging [Member] Goodwill Goodwill beginning balance Goodwill ending balance Goodwill Equity securities Equity securities Equity Securities, FV-NI Equity Equity Contract [Member] Current year Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year Schedule of Lease, Cost Lease, Cost [Table Text Block] Other loss on investments, net Other loss on investments, net Other loss on investments, net Gain (Loss) on Investments Consumer mortgage Commercial real estate Real Estate Loan [Member] Due after five years through ten years Debt Securities, Available-for-Sale, Maturity, Rolling after 5 through 10 Years, Weighted Average Yield Transfers out of Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Description of Business, Basis of Presentation, and Changes in Significant Accounting Policies Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Supplemental disclosures Supplemental Cash Flow Information [Abstract] Restricted cash held for securitization trusts Restricted Cash Collections For Securitization Trust Restricted cash collections for securitization trust. 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Unamortized premiums and discounts and deferred fees and costs Financing Receivable, Unamortized Loan Cost (Fee) and Purchase Premium (Discount) Entity Entity [Domain] Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Remaining performance obligation, expected timing of satisfaction, period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Noninsurance contracts Noninsurance Contracts [Member] Noninsurance Contracts [Member] Interest rate cash flow hedge loss reclassified to earnings Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net Interest Interest Paid, Excluding Capitalized Interest, Operating Activity Document Fiscal Year Focus Document Fiscal Year Focus Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Nonrecourse Nonrecourse [Member] Brokered/agent commissions Brokered/Agent Commissions [Member] Brokered/Agent Commissions [Member] Operating lease expense Operating Lease, Cost Carrying value Reported Value Measurement [Member] Hedged variable-rate commercial loans Variable-Rate Commercial Borrowings [Member] Variable-rate commercial borrowings [Member] Equity Equity [Abstract] Financing receivable, recorded investment, nonaccrual status Financing Receivable, Nonaccrual Upward adjustments Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount Segment Information Segment Reporting Disclosure [Text Block] Schedule of Goodwill [Table] Goodwill [Table] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Total derivatives not designated as accounting hedges Not Designated as Hedging Instrument [Member] Fair Value, Asset, Recurring Basis, Still Held [Abstract] Fair Value, Asset, Recurring Basis, Still Held [Abstract] Fair Value, Asset, Recurring Basis, Still Held Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Doubtful Doubtful [Member] Transfers into Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3 Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Accumulated Other Comprehensive Loss Comprehensive Income (Loss) Note [Text Block] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value, Recurring and Nonrecurring [Table] Amortization of intangible assets Amortization of Intangible Assets Noncash collateral placed with counterparties Securities Collateral Placed With Counterparties Securities Collateral Placed With Counterparties Stock repurchased during period, value Stock Repurchased During Period, Value Schedule of Accumulated Other Comprehensive Loss Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Net income (loss) from continuing operations attributable to common shareholders Net income (loss) from continuing operations attributable to common shareholders Net Income (Loss) from Continuing Operations Available to Common Shareholders, Basic Net realized/unrealized losses (gains) Fair Value, Recurring Basis, Unobservable Input Reconciliation, Asset (Liability), Gain (Loss), OCI [Abstract] Mortgage-backed residential Residential Mortgage-Backed Securities [Member] Schedule of Property Subject to or Available for Operating Lease Property, Plant, and Equipment, Lessor Asset under Operating Lease [Table Text Block] Arrangement Duration Trading Arrangement Duration Credit Other Credit Derivatives [Member] Disposal Group, Held-for-Sale or Disposed of by Sale, Not Discontinued Operations Disposal Group, Held-for-Sale or Disposed of by Sale, Not Discontinued Operations [Member] Segments [Axis] Segments [Axis] Fair Value, Liabilities, Measured on Recurring Basis, Unobservable Input Reconciliation, by Liability Class [Domain] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Local Phone Number Local Phone Number Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Ally Credit Card Ally Credit Card [Member] Ally Credit Card Other, net Payment for (Proceeds from) Other Investing Activity Maturity Within 30 Days Maturity Less than 30 Days [Member] Assets Assets [Abstract] Nonmarketable equity investments Nonmarketable Equity Investments [Member] Nonmarketable Equity Investments Underlying Security Market Price Change Underlying Security Market Price Change, Percent Debt Instrument [Axis] Debt Instrument [Axis] Fair Value Fair Value Disclosures [Text Block] Accelerated Share Repurchases [Line Items] Accelerated Share Repurchases [Line Items] Purchased options Interest Rate Purchased Options [Member] Interest Rate Purchased Options 2031 and thereafter Lessee, Operating Lease, Liability, To Be Paid, After Year Four Lessee, Operating Lease, Liability, To Be Paid, After Year Four Cost basis Equity Securities Without Readily Determinable Fair Value, Initial Cost Basis Equity Securities Without Readily Determinable Fair Value, Initial Cost Basis Schedule of Loan Modifications Financing Receivable, Modified [Table Text Block] Common stock repurchases Treasury Stock, Value, Acquired, Cost Method Insurance commissions Insurance Commissions 30–59 days past due Financial Asset, 30 to 59 Days Past Due [Member] Cash Flow Received and Paid to Nonconsolidated Securitization Entities [Line Items] Transfer of Financial Assets Accounted for as Sales [Line 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Entity Registrant Name Entity Registrant Name Loss on cash flow hedges to be recognized within twelve months Cash Flow Hedge Gain (Loss) to be Reclassified within 12 Months Credit Rating [Axis] Credit Rating, Fitch [Axis] Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Capital to risk weighted assets, well-capitalized minimum Banking Regulation, Total Risk-Based Capital Ratio, Well Capitalized, Minimum Closed portfolio and beneficial interest, last-of-layer, amortized cost Financial Asset, Closed Portfolio and Beneficial Interest, Portfolio Layer Method, Amortized Cost Total Debt Securities, Held-to-Maturity, Excluding Accrued Interest, After Allowance for Credit Loss, Yield Debt Securities, Held-to-Maturity, Excluding Accrued Interest, After Allowance for Credit Loss, Yield Property and equipment depreciation Depreciation, Nonproduction 2027 Debt Instrument, Redemption, Period Two [Member] Total assets Assets, Fair Value Disclosure Deposits [Abstract] Deposits [Abstract] Total past due Financial Asset, Past Due [Member] Carrying amount, equity investments without a readily determinable fair value Equity Securities without Readily Determinable Fair Value, Amount Number of operating segments Number of Operating Segments Assets held-in-trust Asset, Held-in-Trust Purchases of equity securities Payments to Acquire Equity Securities, FV-NI Derivative liabilities, net amount Derivative Liability, Subject to Master Netting Arrangement, after Offset and Deduction Secured debt Secured Debt, Long-Term And Short-Term, Combined Amount Secured Debt, Long-Term And Short-Term, Combined Amount Restatement Determination Date: Restatement Determination Date [Axis] Agency mortgage-backed commercial Mortgage-Backed Securities, Issued By US Government Sponsored Enterprises, Commercial [Member] Mortgage-Backed Securities, Issued By US Government Sponsored Enterprises, Commercial Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Originations and purchases of loans held-for-sale Payment for Origination and Purchase, Loan, Held-for-Sale Name Trading Arrangement, Individual Name Total assets, net amounts of assets/liabilities presented on the Condensed Consolidated Balance Sheet Derivative Asset, Security Purchased under Agreement to Resell, and Security Borrowed, Subject to Master Netting Arrangement, after Offset 2026 Sales-Type and Direct Financing Leases, Payment to be Received, Remainder of Fiscal Year Total gain on fair value hedging relationships Total Interest And Amortization Income (Expense) Hedging Relationship Total amount of interest and amortization of basis adjustment income (expense) on hedging relationships. Schedule of Short-term Debt [Table] Short-Term Debt [Table] Net realized/unrealized gains Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings [Abstract] Due after one year through five years Debt Securities, Available-for-Sale, Maturity, Rolling after One Through Five Years, Weighted Average Yield Other Operating Expenses Other Operating Income and Expense [Text Block] Included in OCI Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI Corporate Finance operations Corporate Finance Operations Segment [Member] Corporate Finance Operations Segment Impairment of FHLB and FRB stock Federal Home Loan Bank Stock And Federal Reserve Bank Stock, Impairment Loss Federal Home Loan Bank Stock And Federal Reserve Bank Stock, Impairment Loss Preferred stock Preferred Stock [Member] Name Awards Close in Time to MNPI Disclosures, Individual Name Other liabilities Other Accrued Liabilities Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Cash equivalents Cash Equivalents, at Carrying Value Share-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Treasury stock, at cost (215,488,533 and 211,862,875 shares) Treasury Stock, Value Schedule of Quantitative Information and Net Credit Losses about Securitized and Other Financial Assets Managed Together Schedule Of Quantitative Information And Net Credit Losses About Securitized And Other Financial Assets Managed Together [Table Text Block] Tabular disclosure for the total principal amount outstanding, and delinquencies at the end of the period of securitized or asset-backed financing arrangement assets and any other financial assets that are managed together. Net unrealized losses arising during the period, tax Other Comprehensive Income (Loss) before Reclassifications, Tax Fair Value by Liability Class [Axis] Liability Class [Axis] Number of operating subsegments Number Of Operating Subsegments Number Of Operating Subsegments Ally Invest Ally Invest [Member] Ally Invest [Member] Due after ten years Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years Segments [Domain] Segments [Domain] Income Statement Location [Axis] Statement of Income Location, Balance [Axis] Investment Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Repurchase Agreements and Similar Transactions, Maturity Periods [Domain] Repurchase Agreements and Similar Transactions, Maturity Periods [Domain] Debt instrument, unamortized discount, current Debt Instrument, Unamortized Discount, Current Balance Sheet Location [Domain] Statement of Financial Position Location, Balance [Domain] Derivative assets, gross amounts not offset on the Condensed Consolidated Balance Sheet, collateral Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset Available-for-sale securities Available-for-sale securities AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] Interest expense Interest Expense, Operating and Nonoperating [Abstract] Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Pledged assets for Federal Reserve Bank Pledged assets for Federal Reserve Bank [Member] Assets restricted as collateral to the Federal Reserve Bank [Member] Derivative liabilities, gross amounts offset on the Condensed Consolidated Balance Sheet Derivative Liability, Subject to Master Netting Arrangement, 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Claims and Claims Adjustment Expense Nonmarketable equity investments Nonmarketable equity investments Nonmarketable Equity Investments Nonmarketable Equity Investments Amount 60 days or more past due Derecognized Assets, Securitized or Asset-Backed Financing Arrangement Assets and any Other Financial Assets Managed Together, Delinquent Amount at End of Period Change in unrealized gain (loss) on fair value hedging instruments Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments Contingencies (refer to Note 23) Commitments and Contingencies Aggregate liquidation preference Preferred Stock, Liquidation Preference, Value Fair Value, Liability, Recurring Basis, Still Held [Abstract] Fair Value, Liability, Recurring Basis, Still Held [Abstract] Fair Value, Liability, Recurring Basis, Still Held Year one, originated, current fiscal year, writeoff Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year, Writeoff Business Combination [Axis] Business Combination [Axis] All other revenue Revenue Not from Contract with Customer, Other 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] Due after one year through five years Debt Securities, Held-to-Maturity, Maturity, Rolling after One Through Five Years, Weighted Average Yield Schedule of Investment Income Investment Income [Table Text Block] Assets Assets, Total [Member] Short-term Debt [Line Items] Short-Term Debt [Line Items] Net deferred tax assets Deferred Tax Assets, Net Hedged liability, fair value hedge, cumulative increase (decrease) Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Due after ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Hedged liability, fair value hedge Hedged Liability, Fair Value Hedge Schedule of Pledged Assets for the Payment of the Related Secured Borrowings and Repurchase Agreements Pledged assets for the payment of the related secured borrowings and repurchase agreements [Table Text Block] Pledged assets for the payment of the related secured borrowings and repurchase agreements [Table Text Block] Diluted earnings per common share Earnings Per Share, Diluted [Abstract] 60–89 days past due Financial Asset, 60 to 89 Days Past Due [Member] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Hedging Designation [Axis] Hedging Designation [Axis] Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract] Short-Duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract] Net investment hedging Net Investment Hedging [Member] Derivative Contract Type [Domain] Derivative Contract [Domain] Financing Receivable, Allowance for Credit Loss [Table] Financing Receivable, Allowance for Credit Loss [Table] Total amount Loan, Managed and Securitized or Asset-Backed Financing Arrangement, Principal Outstanding Lessor, term of contract Lessor, Operating Lease, Term of Contract Gross realized losses Debt Securities, Available-for-Sale, Realized Loss All Individuals All Individuals [Member] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Name Forgone Recovery, Individual Name Reserves for Insurance Losses and Loss Adjustment Expenses Short-Duration Insurance and Deposit Contracts [Text Block] 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] Disposal Group Classification [Axis] Disposal Group Classification [Axis] Downward adjustments (including impairment) Equity Securities Without Readily Determinable Fair Value, Downward Price Adjustment And Accumulated Impairment Loss, Cumulative Amount Equity Securities Without Readily Determinable Fair Value, Downward Price Adjustment And Accumulated Impairment Loss, Cumulative Amount Financing receivable, nonaccrual, with no allowance Financing Receivable, Nonaccrual, No Allowance Year five, originated, four years before current fiscal year, writeoff Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff Debt Securities, Held-to-maturity [Table] Debt Securities, Held-to-Maturity [Table] Schedule of Location and Amounts of Gains and Losses Related to Interest and Amortization on Derivative Instruments Schedule of Derivative Instruments [Table Text Block] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] Commercial Commercial Portfolio Segment [Member] Other, net Increase (Decrease) in Other Operating Assets and Liabilities, Net Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Yield Debt Securities, Available-for-Sale, Rolling Maturity, Weighted Average Yield [Abstract] Other cash flows received Cash Flows Between Transferor and Transferee, Receipts on Transferor's Interest in Transferred Financial Assets, Other Leasing Lessor, Operating Leases [Text Block] Insurance premiums and service revenue earned Insurance Services Revenue Securitizations And Variable Interest Entities [Abstract] Securitizations And Variable Interest Entities [Abstract] Securitizations and Variable Interest Entities [Abstract] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Title of 12(b) Security Title of 12(b) Security Residual value guarantee, percentage Residual Value Guarantee Residual Value Guarantee Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Provision for credit losses Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) Accounts payable Accounts Payable Capitalized contract cost, amortization Capitalized Contract Cost, Amortization Derecognized Transferred Financial Assets and Other Financial Assets Managed Together [Table] Derecognized Transferred Financial Assets and Other Financial Assets Managed Together [Table] Earnings Per Share [Abstract] Earnings Per Share [Abstract] BBB Fitch, BBB Rating [Member] Variable lease payments, excessive wear and tear Variable Lease Payments, Excessive Wear And Tear Variable lease payments related to excess mileage and wear and tear on operating lease vehicles. Debt instrument, reference asset amount Debt Instrument, Reference Asset Amount Debt Instrument, Reference Asset Amount Year three, originated, two years before current fiscal year, writeoff Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff Total gain on fair value hedging relationships Gain (Loss) on Fair Value Hedges Recognized in Earnings Automotive Finance operations Automotive Finance Operations Segment [Member] Automotive finance operations [Member] Short-term Debt, Type [Axis] Short-Term Debt, Type [Axis] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] 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 Loss [Line Items] Award Timing Disclosures [Line Items] Measurement Frequency [Domain] Measurement Frequency [Domain] Federal Home Loan Bank Advances Federal Home Loan Bank Advances [Member] Net reserves for insurance losses and loss adjustment expenses Liability for Unpaid Claims and Claims Adjustment Expense, Net Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Table] Total financing revenue and other interest income Total financing revenue and other interest income Total Financing Revenue And Other Interest Income Represents the total of interest income, dividend income, and income from operating leases. Securities sold under agreement to repurchase, gross amounts of recognized assets/liabilities Security Sold under Agreement to Repurchase, Subject to Master Netting Arrangement, before Offset Noncancelable lease term Lessee, Operating Lease, Noncancellable Lease Term Lessee, Operating Lease, Noncancellable Lease Term Loan Restructuring Modification [Domain] Loan Restructuring Modification [Domain] Other operating expenses Other Operating Income (Expense) [Member] Total finance receivables and loans, net Finance receivables and loans, net Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss Qualitative and Quantitative Information, Transferor's Continuing Involvement, Transferred Financial Assets, by Transfer or Transferee [Axis] Qualitative and Quantitative Information, Transferor's Continuing Involvement, Transferred Financial Assets, by Transfer or Transferee [Axis] Net income (loss) Net (loss) income Net income (loss) Net Income (Loss) Attributable to Parent Subsequent Event [Table] Subsequent Event [Table] Credit-linked note derivatives Credit-Linked Note Derivatives [Member] Credit-Linked Note Derivatives Capital to risk-weighted assets, ratio Banking Regulation, Total Risk-Based Capital Ratio, Actual 12 months or longer Debt Securities, Available-for-Sale, Unrealized Loss Position, Long [Abstract] Debt Securities, Available-for-Sale, Unrealized Loss Position, Long Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Number of shares authorized (in shares) Preferred Stock, Shares Authorized Repurchases of common stock Payments for Repurchase of Common Stock Adoption Date Trading Arrangement Adoption Date Hedged Asset, Statement of Financial Position [Extensible Enumeration] Hedged Asset, Statement of Financial Position [Extensible Enumeration] Variable Interest Entity Variable Interest Entity [Member] Variable Interest Entity Financing Receivable, Past Due [Table] Financing Receivable, Past Due [Table] Schedule of Offsetting Liabilities Offsetting Liabilities [Table Text Block] Retained earnings Retained Earnings (Accumulated Deficit) Amounts reclassified from accumulated other comprehensive income Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), Reclassification, before Tax 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] Purchases of held-to-maturity securities Payments to Acquire Held-to-Maturity Securities Class of Stock [Axis] Class of Stock [Axis] Cash flow hedges Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Disposals of operating lease assets Disposals Of Operating Lease Assets The cash inflow from the disposal of operating lease assets. Total liabilities, gross amounts of recognized assets/liabilities Derivative Liability, Security Sold under Agreement to Repurchase, and Security Loaned, Subject to Master Netting Arrangement, before Offset Minimum capital conservation buffer Banking Regulation, Capital Conservation Buffer, Capital Conserved, Minimum Property, Plant, and Equipment, Lessor Asset under Operating Lease [Line Items] Property, Plant, and Equipment, Lessor Asset under Operating Lease [Line Items] 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] Statement [Table] Statement [Table] Reconciliation of net income (loss) 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] (Loss) gain on sales of financial assets Securitization or Asset-Backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale, Gain (Loss) on Sale Preferred stock dividends — Series C Series C Preferred Stock [Member] Deferred revenue Contract with Customer, Liability Amortized cost basis of available-for-sale securities Debt Securities, Available-for-Sale, Amortized Cost, Fiscal Year Maturity [Abstract] Schedule of Fair Value, Assets Measured on a Recurring Basis, Unobservable Input Reconciliation Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] All Adjustments to Compensation All Adjustments to Compensation [Member] Interest rate concessions Contractual Interest Rate Reduction [Member] Amendment Flag Amendment Flag Debt securities, available-for-sale, accrued interest receivable Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales Total gross reserves for insurance losses and loss adjustment expenses, beginning balance Total gross reserves for insurance losses and loss adjustment expenses, ending balance Reserves for insurance losses and loss adjustment expenses Liability for Claims and Claims Adjustment Expense 2027 Sales-Type and Direct Financing Leases, Payment to be Received, Year One Termination Date Trading Arrangement Termination Date Interest-bearing Interest-Bearing Deposits in Banks and Other Financial Institutions Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Allowance for loan losses Allowance for loan losses Allowance, beginning balance Allowance, ending balance Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest Operating lease, weighted average discount rate Operating Lease, Weighted Average Discount Rate, Percent Basic weighted-average common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Derivative contracts in a receivable position Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement Schedule of Deposit Liabilities Deposit Liabilities, Type [Table Text Block] Subsequent Events [Abstract] Subsequent Events [Abstract] Segment Reporting [Abstract] Segment Reporting [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Reclassification from AOCI, tax Reclassification from AOCI, Current Period, Tax Property, Plant, and Equipment, Lessor Asset under Operating Lease [Table] Property, Plant, and Equipment, Lessor Asset under Operating Lease [Table] Reclassification from AOCI, before tax Reclassification from AOCI, Current Period, before Tax, Attributable to Parent Lease and loan administration Lease And Loan Administration Lease and loan administration. Fixed-rate automotive loans Fixed-rate Automotive Loans [Member] Fixed-rate Automotive Loans [Member] Net realized gain (loss) on available-for-sale securities Debt Securities, Available-for-Sale, Realized Gain (Loss) Debt instrument, unamortized discount Debt Instrument, Unamortized Discount Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Consolidated Entities [Axis] Consolidated Entities [Axis] Common stock, par value per share (in dollars per share) Common Stock, Par or Stated Value Per Share Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivative Instruments and Hedging Activities Disclosures [Line Items] Net realized gain on equity securities Equity Securities, FV-NI, Realized Gain (Loss) Insurance operations Insurance Operations Segment [Member] Insurance Operations [Member] Interest and dividends exempt from U.S. federal income tax Interest Income, Securities, State and Municipal Leasing Lessor, Direct Financing Leases [Text Block] Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Capital to risk-weighted assets, amount Banking Regulation, Total Capital, Actual Other comprehensive income (loss), tax effect Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Amounts excluded from effectiveness testing Derivative, Excluded Component, Gain (Loss), Recognized in Earnings Present value of lease payments recorded as lease receivable Sales-type and Direct Financing Leases, Lease Receivable Upward adjustments Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount Derivative assets, gross amounts offset on the Condensed Consolidated Balance Sheet Derivative Asset, Subject to Master Netting Arrangement, Liability Offset Subsequent Events Subsequent Events [Text Block] Insider Trading Arrangements [Line Items] Originated, more than five years before current fiscal year 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] Debt securities, available-for-sale, allowance for credit loss, excluding accrued interest Credit reserves, available-for-sale Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest Other Product and Service, Other [Member] Total liabilities Carrying value of total liabilities Liabilities Amortized cost Financial Asset, Closed Portfolio, Portfolio Layer Method, Amortized Cost Principal forgiveness, amount forgiven Financing Receivable, Modified, Principal Forgiveness, Amount Financing Receivable, Modified, Principal Forgiveness, Amount Percentage of total Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage Trial modifications, term Financing Receivable, Trial Modifications, Term Financing Receivable, Trial Modifications, Term Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Savings, money market, and spending accounts Deposits, Savings Deposits 2030 Debt Instrument, Redemption, Period Five [Member] Asset-backed Asset-Backed Securities [Member] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Consolidation Items [Axis] Consolidation Items [Axis] Unfunded commitments, period to be paid Investment Program, Proportional Amortization Method, Elected, Commitment, Period To Be Paid Investment Program, Proportional Amortization Method, Elected, Commitment, Period To Be Paid Other Other Other Loans [Member] All loans not classified as automotive or mortgage loans. Proceeds from repayments of held-to-maturity securities Proceeds from Maturities, Prepayments and Calls of Held-to-Maturity Securities Held-to-maturity securities (fair value of $4,387 and $4,451) Amortized cost basis Held-to-maturity securities Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Corporate debt Corporate Debt Securities [Member] Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Cash Flows [Extensible Enumeration] Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Cash Flows [Extensible Enumeration]