Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Proceeds from new debt Proceeds from Issuance of Long-Term Debt and Capital Securities, Net Entity Listings, Exchange [Axis] Entity Listings, Exchange [Axis] Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Maturing 2026-2028 Maturing 2026-2028 [Member] Maturing 2026-2028 Current liabilities Business Combination, Recognized Liability Assumed, Liability, Current Award Timing Predetermined Award Timing Predetermined [Flag] Entity File Number Entity File Number 4.000% Notes due 2043 4.000% Notes due 2043 [Member] 4.000% Notes due 2043 0.300% Notes due 2028 0.300% Notes due 2028 [Member] Notes bearing 0.300% due 2028. Tabular List, Table Tabular List [Table Text Block] Other comprehensive income/(loss), Tax (Expense)/Benefit Other Comprehensive Income (Loss), Tax New Standards to be Implemented New Accounting Pronouncements, Policy [Policy Text Block] Divestiture of businesses, net of cash transferred Proceeds from Divestiture of Businesses, Net of Cash Divested Financing receivable and net investment in lease, unguaranteed residual value Financing Receivable and Net Investment in Lease Unguaranteed Residual Asset The estimate of the financing receivable and net investment in lease's economic value at the end of the lease term that includes the unguaranteed residual value. Goodwill Goodwill [Line Items] Adjustment to Compensation: Adjustment to Compensation [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Strategy and Technology Strategy And Technology [Member] Strategy And Technology Amounts recorded in the Consolidated Balance Sheet related to cumulative basis adjustments for fair value hedges Summary of Fair Value Hedge Activity [Abstract] Revenue Recognition Revenue from Contract with Customer [Text Block] Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Net investment in lease, gross Net Investment in Lease, before Allowance for Credit Loss, Fee and Loan in Process Amortized cost, before allowance for credit loss, fee, and loan in process, of net investment in lease. Adjustment to Compensation, Amount Adjustment to Compensation Amount Pension Plan Pension Plan [Member] Percentage of remaining performance obligation expected to be recognized Revenue, Remaining Performance Obligation, Percentage Short-term borrowings/(repayments) less than 90 days — net Proceeds from (Repayments of) Short-Term Debt, Maturing in Three Months or Less Maturing 2054 Maturing 2054 [Member] Maturing 2054 Stock-based compensation Share-Based Payment Arrangement, Noncash Expense Stock Options Share-Based Payment Arrangement, Option [Member] Expense and other (income): Expense and Other Income [Abstract] Expense and Other Income [Abstract] Total financing receivables, net Financing Receivable, after Allowance for Credit Loss Net (gains)/losses from securities and investment assets Debt and Equity Securities, Realized Gain (Loss) Finance Leases Portfolio Segment Finance Leases Portfolio Segment [Member] Offsetting Derivatives Derivatives, Offsetting Fair Value Amounts, Policy [Policy Text Block] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Cash dividends paid — common stock Dividends, Common Stock, Cash Total IBM stockholders’ equity Equity, Attributable to Parent 6.22% Debentures due 2027 6.22% Debentures due 2027 [Member] Debentures bearing 6.22% due 2027. Insider Trading Policies and Procedures [Line Items] Common stock, shares authorized (in shares) Common Stock, Shares Authorized NYSE CHICAGO, INC. NYSE CHICAGO, INC. [Member] Derivatives not designated as hedging - Liabilities Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value Liabilities and equity Liabilities and Equity [Abstract] Held for sale Accounts and Financing Receivables, Held-for-Sale, Not Part of Disposal Group, after Valuation Allowance Cover [Abstract] Cover [Abstract] Cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Maximum Maximum [Member] Reclassification of (gains)/losses to net income Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), And Derivative, Excluded Component, Reclassification, Before Tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), And Derivative, Excluded Component, Reclassification, Before Tax Maturing 2096 Maturing 2096 [Member] Borrowings denominated in U.S. dollars with maturities in 2096. Financing receivable and net investment in lease, unearned income Financing Receivable And Net Investment In Lease Unamortized Loan Commitment Origination Fee And Premium Discount Amount of unamortized loan commitment, origination, and other costs (fees) and purchase premium (discount) on financing receivable and net investment in lease. Intangible assets — net Net Carrying Amount Finite-Lived Intangible Assets, Net Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Borrowings Debt Instrument [Line Items] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] 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] Retirement Benefits [Abstract] Retirement Benefits [Abstract] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Income from continuing operations before income taxes Segment profit Total pre-tax income from continuing operations Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Schedule of Long-Term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Retirement of fully amortized intangible assets Intangible Assets Fully Amortized Retired The amount of fully amortized intangible assets that the entity retired during the period. Intellectual property and custom development income Intellectual Property and Custom Development Income The aggregate amount of income from licensing and sales of the rights to certain intellectual property including internally developed patents, trade secrets and technological know-how. Hedging adjustments on discontinued hedging relationships Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Maturing 2046 Maturing 2046 [Member] Borrowings denominated in U.S. dollars with maturities in 2046. Operating Segments Operating Segments [Member] Two Years Revenue, Remaining Performance Obligation, Period One [Member] Revenue, Remaining Performance Obligation, Period One Five-Year Credit Agreement Five-Year Credit Agreement [Member] Credit agreement with an original term of five years, entered into on June 22, 2021, under which the entity and a subsidiary borrower may borrow funds on a revolving basis. Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Line of Credit Facility [Table] Line of Credit Facility [Table] Debt securities - noncurrent Debt Securities, Available-for-Sale, Excluding Accrued Interest, Noncurrent Income from continuing operations Income from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Clients' presence in number of countries Number of Countries in which Entity Operates Stock-based compensation cost included in income from continuing operations Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Maximum length of time hedged Maximum Length of Time Hedged in Cash Flow Hedge Operating lease liabilities Operating Lease, Liability, Current Minimum net interest expense ratio Net Interest Expense Ratio The minimum ratio of interest expense specified in the reporting entity's debt agreements which the reporting entity must maintain in order to be in compliance. Document Fiscal Period Focus Document Fiscal Period Focus Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax, Portion Attributable to Parent Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Award Timing Method Award Timing Method [Text Block] Continuing operations (in dollars per share) Continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Basic Share Third Party Investor Third Party Investor [Member] Represents information pertaining to a third party member in an agreement. Award Type [Axis] Award Type [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Foreign currency translation adjustments Foreign Currency Translation Adjustments Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Stock-Based Compensation Share-Based Payment Arrangement [Policy Text Block] Trading Symbol Trading Symbol Financing receivables transferred and uncollected Financing Receivable, Transferred and Uncollected Amount of financing receivable transferred and uncollected. Schedule of contributions Schedule of Contributions [Table Text Block] Tabular disclosure of contributions. Financing receivables transferred Financing Receivable, Sale and Reclassification to Held-for-Sale Entity Address, City or Town Entity Address, City or Town Equity Awards Equity Awards [Member] Equity Awards Effect of exchange rate changes on cash, 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 Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Income Statement Location [Domain] Statement of Income Location, Balance [Domain] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Total consideration Business Combination, Consideration Transferred Entity Emerging Growth Company Entity Emerging Growth Company 2029 Long-Term Debt, Maturity, Year Three 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] Less: net unamortized debt issuance costs Debt Issuance Costs, Net (Gains)/losses recognized on derivatives Derivative, Gain (Loss) on Derivative, Net Add - Incremental shares associated with contingently issuable shares (in shares) Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares Foreign Currency Denominated Debt Foreign Currency Denominated Debt [Member] Foreign Currency Denominated Debt Retirement-related benefit plans: Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax [Abstract] Schedule of disaggregation of revenue Disaggregation of Revenue [Table Text Block] Thereafter Long Term Debt Maturities Repayments Of Principal After Year Four Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing after fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Prepaid pension assets Assets for Plan Benefits, Defined Benefit Plan 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] Intangible assets, future amortization expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Intangible Assets Intangible Assets, Finite-Lived, Policy [Policy Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Proceeds from issuance of shares Proceeds from Issuance or Sale of Equity Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current 3.450% Notes due 2034 3.450% Notes due 2034 [Member] 3.450% Notes due 2034 Interest Income Interest Income, Operating and Nonoperating Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Provision for/(benefit from) income taxes Income Tax Expense (Benefit) Discontinued operations (in dollars per share) Discontinued operations (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Total net investment in lease, net Net Investment in Lease, after Allowance for Credit Loss Document Information [Line Items] Document Information [Line Items] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Hedging Relationship [Axis] Hedging Relationship [Axis] Non-operating retirement-related (costs)/income Nonoperating Retirement Related Costs Charges excluded from operating earnings and segment pre-tax income including: defined benefit plan and other postretirement benefit plan amortization of prior service costs, interest cost, expected return on plan assets, amortized actuarial gains/losses, the impacts of any plan curtailments/settlements, pension insolvency costs and other costs. Noncurrent portion Noncurrent Assets [Member] Information pertaining to noncurrent assets. Other accounts receivable, allowances Allowance for Credit Loss, Receivable, Other, Current Held for Sale Commercial financing receivables, Held for sale [Member] Represents information pertaining to commercial financing receivables, held for sale. Other Financing Receivable And Net Investment In Lease, Allowance For Credit Losses, Other Financing Receivable And Net Investment In Lease, Allowance For Credit Losses, Other Increase (Decrease) Net investment in lease, amortized cost Net Investment in Lease, before Allowance for Credit Loss Other Income and Expenses [Abstract] Operating lease right-of-use assets amortization expense Operating Lease, Right-of-Use Asset, Periodic Reduction Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Goodwill Additions Goodwill, Acquired During Period Less: Accumulated depreciation Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, Accumulated Depreciation and Amortization Hybrid Infrastructure Hybrid Infrastructure [Member] Represents information pertaining to Hybrid Infrastructure. Acquisitions & Divestitures Mergers, Acquisitions and Dispositions Disclosures [Text Block] Acquisition of businesses, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired 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] Contingencies Commitments and Contingencies, Policy [Policy Text Block] Commitments and Contingencies Disclosure [Abstract] Maturing 2045 Maturing 2045 [Member] Borrowings with maturities in 2045. Software Software [Member] Represents information pertaining to Software. Maturing 2037 Maturing 2037 [Member] Borrowings that mature in 2037 Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Credit facility term Debt Instrument, Term Subsequent Event Subsequent Event [Member] Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] 5.875% Debentures due 2032 5.875% Debentures due 2032 [Member] Debentures bearing 5.875% due 2032. PEO Total Compensation Amount PEO Total Compensation Amount Depreciation Depreciation Curtailments and settlements Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax Money market funds Money Market Funds [Member] Remainder of 2026 Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year Equity Components [Axis] Equity Components [Axis] Services Technology Service [Member] Confluent Confluent [Member] Confluent Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Sales Product [Member] Financing receivable and net investment in lease, gross Financing Receivable And Net Investment In Lease Before Allowance For Credit Loss And Fee Amortized cost, before allowance for credit loss, fee, and loan in process, of financing receivable and net investment in lease. Entity Address, State or Province Entity Address, State or Province Maturing 2038 Maturing 2038 [Member] Borrowings denominated in U.S. dollars with maturities in 2038. Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Security, Excluded EPS Calculation [Table] Euro Member Countries, Euro Euro Member Countries, Euro Total current liabilities Liabilities, Current Individual: Individual [Axis] Cost of defined contribution plans Defined Contribution Plan, Cost Property, plant and equipment Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, before Accumulated Depreciation and Amortization Financing Financial Service [Member] Accounting Changes and Error Corrections [Abstract] Accounting Changes and Error Corrections [Abstract] Cash dividends paid Payments of Ordinary Dividends, Common Stock Research and development Research and Development Expense [Member] Euro fixed-rate notes Euro fixed-rate notes [Member] Euro fixed-rate notes Maturing 2032 Maturing 2032 [Member] Borrowings with maturities in 2032. Finance lease obligations, interest rate (as a percent) Finance Lease, Weighted Average Interest Rate Represents the weighted average interest rate on finance lease. Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Leases Lessor, Sales-type Leases [Text Block] Entity Interactive Data Current Entity Interactive Data Current Property, plant and equipment/noncurrent assets Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Property Plant and Equipment and Other Noncurrent Assets The aggregate of property, plant and equipment and other noncurrent assets recognized as of the acquisition date. Segment profit year-to-year change (as a percent) Segment Reporting Information, Segment Profit Change, Percent The percentage change from year to year in the segment profit for segment reporting purposes. 1.250% Notes due 2034 1.250% Notes due 2034 [Member] Notes bearing 1.250% due 2034. Schedule of transfer of commercial financing assets Transfer of Financial Assets Accounted for as Sales [Table Text Block] Less: current maturities Long-Term Debt and Lease Obligation, Current Long-term debt excluding finance lease obligations Debt Instrument Carrying Amount Excluding Finance Lease Obligations It represents the amount of debt excluding finance lease obligations. Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Curtailments and settlements Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment Maturing 2033 Maturing 2033 [Member] Borrowings with maturities in 2033 Limit based on net tangible assets Debt Covenant Limit Based On Net Tangible Assets The limit on secured indebtedness and sale and leaseback transactions expressed as a percentage of the company's consolidated net tangible assets. This limit is part of covenant contained in the company's indentures which govern its debt securities and various credit facilities. Net gains (losses) before taxes in accumulated other comprehensive income/(loss), cash flow hedges AOCI before Tax, Attributable to Parent Non-U.S. DB plans and multi-employer plans Non-U.S. DB plans and multi-employer plans [Member] Plan designed to provide Non-U.S. participant with pension benefits. Includes, but is not limited to, defined benefit, defined contribution plans, and multi-employer plans. Excludes other postretirement benefits. Entity Central Index Key Entity Central Index Key PEO Name PEO Name Pre-swap annual contractual obligations of long-term debt outstanding Schedule of Maturities of Long-Term Debt [Table Text Block] Revenue Total Revenue Revenue Revenues 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] Schedule of amortized cost by credit quality indicator Financing Receivable Credit Quality Indicators [Table Text Block] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Financing receivable and net investment in lease, allowance for credit loss Allowance for credit losses, beginning balance Allowance for credit losses, ending balance Financing Receivable And Net Investment In Lease Allowance For Credit Losses Amount of allowance for credit loss on financing receivable and net investment in lease. Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plan [Table] Maturing 2029 Maturing 2029 [Member] Borrowings with maturities in 2029. Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Accrual adjustments to reflect actual experience Standard Product Warranty Accrual, Increase (Decrease) for Preexisting Warranties Patents/trademarks Patents/trademarks [Member] The exclusive legal right granted by the government to the owner of the patent to exploit an invention or a process for a period of time specified by law and the rights acquired through registration of a trademark to gain or protect exclusive use of a business name, symbol or other device or style. Financial Assets & Liabilities Financial Instruments Disclosure [Text Block] Add: fair value adjustment Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Class of Stock [Domain] Class of Stock [Domain] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Originated five or more years before latest fiscal year Financing Receivable And Net Investment In Lease Originated Five Or More Years Before Latest Fiscal Year Amortized cost of financing receivable originated more than five years prior to current fiscal year. Long-term debt Long-Term Debt, Excluding Current Maturities Automation Automation [Member] Automation 2029 Finite-Lived Intangible Asset, Expected Amortization, Year Three Balance Sheet Location [Axis] Statement of Financial Position Location, Balance [Axis] Amortized cost Financing Receivable, before Allowance for Credit Loss Maturing 2040 Maturing 2040 [Member] Borrowings denominated in U.S. dollars with maturities in 2040. Time deposits, certificates of deposit and other Bank Time Deposits [Member] Reclassification/amortization, Before Tax Amount Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax Gross Carrying Amount Finite-Lived Intangible Assets, Gross Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Entity Address, Address Line One Entity Address, Address Line One Research and development Research and Development Expense Accumulated Other Comprehensive Income/(Loss) AOCI Attributable to Parent [Member] Notes and accounts receivable - trade, allowances Accounts Receivable, Allowance for Credit Loss, Current Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] Derivative Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Amortization of prior service costs/(credits) Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Fair Value as of Grant Date Award Grant Date Fair Value Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table] Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table] Long-term debt Schedule of Long-Term Debt Instruments [Table Text Block] 1.250% Notes due 2027 1.250% Notes due 2027 [Member] Notes bearing 1.250% due 2027. Add - Incremental shares under stock-based compensation plans (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Purchases of marketable securities and other investments Payments to Acquire Investments Unrecognized compensation cost related to non-vested awards Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Document Quarterly Report Document Quarterly Report Fair value of long-term debt Long-Term Debt, Fair Value Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Counterparty Name [Domain] Counterparty Name [Domain] Financing Financing [Member] Represents information pertaining to Financing. Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Charges incurred Standard Product Warranty Accrual, Decrease for Payments Investments, All Other Investments [Abstract] Investments, All Other Investments [Abstract] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Hybrid Cloud Hybrid Cloud [Member] Hybrid Cloud Net unrealized gains/(losses) on available-for-sale securities Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, before Tax, Portion Attributable to Parent Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Amortization of net (gains)/losses Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax Cash consideration Payments to Acquire Businesses, Gross Non-PEO NEO Non-PEO NEO [Member] Interest income Interest Income, Other Reclassifications and Taxes Related to Items of Other Comprehensive Income Accumulated Other Comprehensive Income (Loss) (net of tax) Accumulated Other Comprehensive Income (Loss) [Line Items] Other Other Intangible Assets [Member] Allowance for credit losses Financing Receivable, Allowance for Credit Loss Award Type [Domain] Award Type [Domain] Prior service costs/(credits) Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] (Gains)/Losses Recognized in Earnings and Other Comprehensive Income - Recognized in OCI - Cash flow hedges Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax Noncontrolling interests Equity, Attributable to Noncontrolling Interest Equity Awards Adjustments Equity Awards Adjustments [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Revenue by Major Products/Service Offerings Revenue by Geography Disaggregation of Revenue [Line Items] Retirement-Related Benefits Defined Benefit Plan Disclosure [Line Items] Compensation Amount Outstanding Recovery Compensation Amount Financing receivable, payment terms Financing Receivable, Payment Terms Term of financing receivables, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. U.S. nonpension postretirement benefit plan U.S. nonpension postretirement benefit plans [Member] U.S. nonpension postretirement benefit plans Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Foreign exchange contracts Foreign Exchange Contract [Member] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Revenue recognized that was included in deferred income at the beginning of the period Contract with Customer, Liability, Revenue Recognized Revenue year-to-year change (as a percent) Segment Reporting Information, Revenue Change, Percent The percentage change from year to year in the revenue for segment reporting purposes. Retirement Plan Type [Domain] Retirement Plan Type [Domain] Variable lease income Variable Lease, Income Schedule of notes and accounts receivable - trade allowance for credit losses Accounts Receivable, Allowance for Credit Loss [Table Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] Net investment in lease, unearned income Net Investment in Lease, Unamortized Loan Cost (Fee) and Purchase Premium (Discount) Amount of unamortized loan commitment, origination, and other costs (fees) and purchase premium (discount) on net investment in lease. Changes in operating assets and liabilities, net of acquisitions/divestitures Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital Commitments Commitments Disclosure [Text Block] Potential reduction in net position of total derivative liabilities Derivative Liability, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset Derivatives designated as hedging - Liabilities Derivative Instruments in Hedges, Liabilities, at Fair Value Total long-term debt (excluding current portion) Long-Term Debt and Lease Obligation Maturing 2026-2027 Maturing 2026-2027 [Member] Borrowings denominated in U.S. dollars with maturities occurring between 2026 to 2027. Accumulated other comprehensive income/(loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Maturing 2050 Maturing 2050 [Member] Borrowings denominated in U.S. dollars with maturities in 2050. Retirement Plan Sponsor Location [Domain] Retirement Plan Sponsor Location [Domain] 2027 Long-Term Debt, Maturity, Year One Intangible asset amortization expense Amortization Of Intangible Assets Net Of Currency Impact The aggregate expense net of any currency impact charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. Maturing 2028 Maturing 2028 [Member] Borrowings with maturities in 2028. Europe/Middle East/Africa EMEA [Member] Performance Shares Performance Shares [Member] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Pledging Purpose [Domain] Pledging Purpose [Domain] Total inventory Inventory, Net Completed technology Developed Technology Rights [Member] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Minimum Minimum [Member] Maturing 2055 Maturing 2055 [Member] Borrowings that mature in 2055 Purchase Price Adjustments Goodwill, Measurement Period Adjustment Financing receivables Accounts, Notes, Loans and Financing Receivable [Line Items] Company Selected Measure Name Company Selected Measure Name Borrowings Debt Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Accounts payable Accounts Payable, Current Current-period accruals Standard Product Warranty Accrual, Increase for Warranties Issued Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Other comprehensive income (loss), Before Tax Amount Other Comprehensive Income (Loss), before Tax Net income on which dilutive earnings per share is calculated Net Income (Loss) Available to Common Stockholders, Diluted Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] Originated three years before latest fiscal year Financing Receivable And Net Investment In Lease Originated Three Years Before Latest Fiscal Year Amortized cost of financing receivable originated three years prior to current fiscal year. Changes in Goodwill Balances Goodwill [Roll Forward] Maturing 2039 Maturing 2039 [Member] Borrowings denominated in U.S. dollars with maturities in 2039. Assuming dilution (in shares) Number of shares on which diluted earnings per share is calculated (in shares) Weighted Average Number of Shares Outstanding, Diluted Maturing 2026 Maturing 2026 [Member] Borrowings denominated in U.S. dollars with maturities in 2026. Segments Segment Reporting, Policy [Policy Text Block] Transaction Processing Transaction Processing [Member] Represents information pertaining to Transaction Processing. Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Derivative [Table] Derivative [Table] Entity Small Business Entity Small Business Average remaining maturity Derivative, Average Remaining Maturity Total sales-type and direct financing lease income Sales Type and Direct Financing Leases Lease Income Net amount of profit (loss) recognized at commencement and interest income from sales-type and direct financing leases. Excludes variable lease income. Client Financing Receivables Client Financing Receivables [Member] Portfolio segment related to total client financing receivables. 1.750% Notes due 2028 1.750% Notes due 2028 [Member] Notes bearing 1.750% due 2028. Document Transition Report Document Transition Report Total interest paid and accrued Interest Costs Incurred Long-Term Debt Long-Term Debt [Member] Underlying Securities Award Underlying Securities Amount Unrealized gains/(losses) arising during the period, Before Tax Amount Other Comprehensive Income (Loss), before Reclassifications, before Tax Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Allowance for Credit Loss, Beginning Balance Allowance for Credit Loss, Ending Balance Accounts Receivable, Allowance for Credit Loss Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Total equity Balance at the beginning of the period Balance at the end of the period Equity, Including Portion Attributable to Noncontrolling Interest Document Type Document Type Earnings Per Share of Common Stock Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Loss Contingencies [Table] Loss Contingencies [Table] Product and Service [Axis] Product and Service [Axis] Revenue Revenue from Contract with Customer, Excluding Assessed Tax Total current assets Assets, Current Acquired intangibles Finite-Lived Intangible Assets Acquired Statistical Measurement [Axis] Statistical Measurement [Axis] Number of business segments to which assets are assigned when ownership is shared between several segments Number Of Business Segments To Which Landlord Ownership Is Assigned To When Assets Are Shared This element represent a number of business segments to which landlord ownership is assigned to when assets are shared between several segments. Other accounts receivable (net of allowances of $37 in 2026 and $37 in 2025) Other Receivables, Net, Current Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Common stock repurchases for tax withholdings Payment, Tax Withholding, Share-Based Payment Arrangement Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Term of contract Derivative, Term of Contract Net income on which basic earnings per share is calculated Net Income (Loss) Available to Common Stockholders, Basic Maturing 2053 Maturing 2053 [Member] Maturing 2053 Current liabilities: Liabilities, Current [Abstract] Other comprehensive income/(loss), net of tax Other comprehensive income/(loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Effect of derivative instruments in the Consolidated Income Statement Derivative Instruments, Gain (Loss) [Table Text Block] Derivative Financial Instruments Derivatives, Methods of Accounting, Hedging Derivatives [Policy Text Block] Business acquisition, cash per share (in dollars per share) Business Combination, Price Per Share Borrowings outstanding Long-Term Line of Credit Level 1 Fair Value, Inputs, Level 1 [Member] Stock-based compensation cost, allocation of recognized costs Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Intangible assets, increase (decrease) Finite-Lived Intangible Assets, Period Increase (Decrease) Total (in dollars per share) Earnings Per Share, Diluted Held for investment (net of allowances of $100 in 2026 and $106 in 2025) Notes and Loans Receivable And Net Investment In Lease, Held For Investment, Net Current Amortized cost, after allowance for credit loss, of financing receivable, including net investment in lease, classified as current. Notes and accounts receivable — trade (net of allowances of $102 in 2026 and $99 in 2025) Accounts Receivable, after Allowance for Credit Loss, Current Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Commercial Financing Receivables Commercial Loan [Member] Treasury stock, shares (in shares) Treasury Stock, Common, Shares Pre-tax income from continuing operations Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] Consolidation Items [Domain] Consolidation Items [Domain] Originated in fiscal year before latest fiscal year Financing Receivable And Net Investment In Lease Originated In Fiscal Year Before Latest Fiscal Year Amortized cost of financing receivable originated in fiscal year prior to current fiscal year. Gross profit Gross Profit Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Financing receivable and net investment in lease, net Notes Receivable And Net Investment In Lease Net Amortized cost, after allowance for credit loss, of financing receivable and net investment in lease. Financing receivables, gross Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process Retirement-related costs/(income) Retirement Related Income (Expense) Retirement Related Income (Expense) Acquisition-related charges Acquisition Related Charges Charges excluded from segment pre-tax income including: acquisition-related in-process research and development, transaction costs, applicable retention, restructuring and related expenses, tax charges related to acquisition integration and pre-closing charges, such as financing costs. 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Two Long-term debt, gross Total Long-Term Debt, Gross Interest on Debt Interest Costs Incurred [Abstract] Compensation and benefits Employee-related Liabilities, Current Property, plant and equipment — net Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Deferred costs Capitalized Contract Cost, Net, Current Thereafter Finite Lived Intangible Assets Amortization Expense Year Five And After Year Five Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in fifth fiscal year and after following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). (Gains)/losses on derivative instruments (Gains)/Losses of Total Hedge Activity Gain (Loss) on Derivative Instruments, Net, Pretax Other (income) and expense Other (income) and expenses [Member] Primary financial statement caption in which reported facts about other income and expense (operating and nonoperating) have been included. Expiration Date Trading Arrangement Expiration Date Other Commitments [Domain] Other Commitments [Domain] Ba1 – C Ba1 - C [Member] Moodys rating Ba1 to C. Equity: Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Write-offs Financing Receivable And Net Investment In Lease Allowance For Credit Losses Write Offs Amount of writeoff of financing receivable and net investment in lease, charged against allowance for credit loss. Workforce rebalancing charges Restructuring Charges Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Entity Current Reporting Status Entity Current Reporting Status Receivables [Abstract] Receivables [Abstract] Derivative Financial Instruments Derivative [Line Items] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Derivative liabilities Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Executive Category: Executive Category [Axis] Foreign Exchange Forward Foreign Exchange Forward [Member] Financing Receivables Financing Receivable [Policy Text Block] Net income plus other comprehensive income/(loss): Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] Interest expense Interest Expense Interest Expense, Operating and Nonoperating Current Fiscal Year End Date Current Fiscal Year End Date Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Summary of the components of financing receivables Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Current portion Current Assets [Member] Information pertaining to current assets. Derivatives not designated as hedging - Assets Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Amortization of prior service costs/(credits) Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax Interest rate contracts Interest Rate Contract [Member] Financial assets and financial liabilities measured at fair value on a recurring basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] 3.625% Notes due 2031 3.625% Notes due 2031 [Member] 3.625% Notes due 2031 Aaa – Baa3 Aaa - Baa3 [Member] Moodys rating Aaa to Baa3. U.S dollar, fixed-rate notes U.S dollar, fixed-rate notes [Member] Represents the information pertaining to U.S. fixed rate notes. Outstanding stock options not included in the computation of diluted earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Weighted-average number of common shares outstanding: Number of shares on which basic earnings per share is calculated: Weighted Average Number of Shares Outstanding, Diluted [Abstract] 2028 Long-Term Debt, Maturity, Year Two Other Commitments [Table] Other Commitments [Table] Maturing 2056 Maturing 2056 [Member] Maturing 2056 Net cash provided by/(used in) financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Measure: Measure [Axis] Credit Rating, Moody's [Axis] Credit Rating, Moody's [Axis] 1.200% Notes due 2040 1.200% Notes due 2040 [Member] Notes bearing 1.200% due 2040. Net gains/(losses) arising during the period Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Common Stock and Additional Paid-in Capital Common Stock Including Additional Paid in Capital [Member] Entity Tax Identification Number Entity Tax Identification Number Deferred costs Capitalized Contract Cost, Net, Noncurrent Additions / (Releases) Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) United Kingdom, Pounds United Kingdom, Pounds Components of the cost/(income) for the company's nonpension postretirement plans Schedule of Net Benefit Costs for Non-pension Postretirement Plans, Domestic and Foreign [Table Text Block] Tabular disclosure of the net benefit costs related to the various types of non-pension postretirement plans including allocation between domestic and foreign plans. Less: Carrying value of underlying assets Cost of Goods Sold, Sales-type Lease Common stock, shares issued (in shares) Common Stock, Shares, Issued 2030 Long-Term Debt, Maturity, Year Four Intangible Assets Including Goodwill Goodwill and Intangible Assets Disclosure [Text Block] Changes in goodwill balances by reportable segment Schedule of Goodwill [Table Text Block] Trading Arrangement: Trading Arrangement [Axis] Infrastructure Support Infrastructure Support [Member] Represents information pertaining to Infrastructure Support. Total Shareholder Return Amount Total Shareholder Return Amount Lease income — operating leases Operating Lease, Lease Income Loss Contingencies Loss Contingencies [Line Items] Commitments Guarantees, Indemnifications and Warranties Policies [Policy Text Block] Unallocated corporate amounts and other Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Security Exchange Name Security Exchange Name Total lease income Lease Income Remainder of 2026 Long-Term Debt, Maturity, Remainder of Fiscal Year Financing Receivables Financing Receivables [Text Block] Amount of credit facility Line of Credit Facility, Maximum Borrowing Capacity Business Combination, Consideration Transferred, Equity Interest, Type [Domain] Business Combination, Consideration Transferred, Equity Interest, Type [Domain] Work in process and raw materials Inventory, Work in Process and Raw Materials, Net of Reserves Marketable securities Debt securities - current Debt Securities, Available-for-Sale, Excluding Accrued Interest, Current Pledging Purpose [Axis] Pledging Purpose [Axis] Retirement and nonpension postretirement benefit obligations Liability, Defined Benefit Plan, Noncurrent Statement [Line Items] Statement [Line Items] Remaining Performance Obligations Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Held for Investment Commercial financing receivables, Held for investment [Member] Represents information pertaining to commercial financing receivables, held for investment. Cash and cash equivalents Cash and Cash Equivalent Unused amounts in lines of credit to third-party entities and commitments for future financing to clients Unused Commitments to Extend Credit Subsequent Event [Line Items] Subsequent Event [Line Items] Common Stock Common Stock [Member] Net change in cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Total retirement-related benefit plans Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent Current assets Business Combination, Recognized Asset Acquired, Asset, Current Cash dividend per common share (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Statistical Measurement [Domain] Statistical Measurement [Domain] Non-U.S. Plans Foreign Plan [Member] Debt instrument, weighted-average interest rate (as a percent) Long-Term Debt, Weighted Average Interest Rate, at Point in Time Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Common stock Common Stocks, Including Additional Paid in Capital Interest Rate Swap Interest Rate Swap [Member] Other Noncurrent Assets Other Noncurrent Assets [Member] Other (Income) and Expense Other Income and Other Expense Disclosure [Text Block] Leases [Abstract] Leases [Abstract] Total unrealized gains/(losses) on cash flow hedges Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), And Derivative, Excluded Component, After Reclassification, Before Tax, Parent Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), And Derivative, Excluded Component, After Reclassification, Before Tax, Parent Basic: Earnings Per Share, Basic [Abstract] Stock awards issued (in shares) Business Combination, Consideration Transferred, Equity Interest, Share Issued, Number of Shares Contract assets Contract with Customer, Asset, after Allowance for Credit Loss, Current Deferred income Deferred income (noncurrent) Deferred Revenue, Noncurrent Retirement Plan Name [Axis] Retirement Plan Name [Axis] Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Total (in dollars per share) Earnings Per Share, Basic (Gains)/Losses Recognized in Earnings and Other Comprehensive Income - Recognized in OCI - Net investment hedges Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax Segment profit margin (as a percent) Segment Reporting Information, Segment Profit Margin The segment profit margin percentage for segment reporting purposes. Other comprehensive income/(loss) Other Comprehensive Income (Loss), Net of Tax Revenue and pre-tax income by segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Discontinued operations (in dollars per share) Discontinued operations (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Short-term debt Short-Term Debt Remaining performance obligations related to customer contracts that are unsatisfied or partially unsatisfied Revenue, Remaining Performance Obligation, Amount Other costs/(credits) Defined Benefit Plan, Other Cost (Credit) Pre-tax stock-based compensation cost increase (decrease) Change In Pretax Stock Based Compensation Cost Represents the change in the pre-tax stock-based compensation cost from the corresponding period in the prior year. Three-Year Credit Agreement Three-Year Credit Agreement [Member] Credit agreement with an original term of three years, entered into on June 22, 2021, under which the entity and a subsidiary borrower may borrow funds on a revolving basis. Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Proceeds from disposition of property, plant and equipment/other Proceeds from Sale of Productive Assets Accounts and Financing Receivables [Table] Accounts and Financing Receivables [Table] Investments and sundry assets Investments and Other Noncurrent Assets Derivative Instruments, Gain (Loss) Derivative Instruments, Gain (Loss) [Line Items] Pre-tax stock-based compensation cost Share-Based Payment Arrangement, Expense 1.500% Notes due 2029 1.500% Notes due 2029 [Member] Notes bearing 1.500% due 2029. Hedging Designation [Domain] Hedging Designation [Domain] Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Share-based compensation Share-Based Payment Arrangement, Expense, Excluding Nonoperating Acquisition-Related Charges Share-Based Payment Arrangement, Expense, Excluding Nonoperating Acquisition-Related Charges Current assets: Assets, Current [Abstract] Total liabilities and equity Liabilities and Equity Antidilutive stock options Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Total retirement-related benefit plans Net Change Retirement- Related Benefit Plans Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Total net stock-based compensation cost Share-Based Payment Arrangement, Expense, after Tax Net interest excluding the Financing segment Interest Income (Expense), Operating and Nonoperating, Adjusted To Exclude Financing Segment Interest Income (Expense), Operating and Nonoperating, Adjusted To Exclude Financing Segment Other revenue Revenues Excluding Disposal Groups Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process, excluding amounts attributable to disposal groups. Impairment for credit losses Debt Securities, Available-for-Sale, Allowance for Credit Loss, Period Increase (Decrease) Treasury Stock Treasury Stock, Common [Member] Maturing 2027 Maturing 2027 [Member] Borrowings with maturities in 2027. Pay vs Performance Disclosure [Line Items] Liabilities: Liabilities [Abstract] Finance Lease Obligations Maturing 2026-2035 Finance Lease Obligations Maturing 2026-2035 [Member] Finance Lease Obligations Maturing 2026-2035 Revenue, Remaining Performance Obligation, Period [Axis] Revenue, Remaining Performance Obligation, Period [Axis] Revenue, Remaining Performance Obligation, Period Other liabilities Other Liabilities, Noncurrent Goodwill impairment losses Goodwill, Impairment Loss (Gains)/losses recognized in earnings attributable to risk being hedged Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge Components of the company's financing receivables Sales-Type and Direct Financing Leases, Payment to be Received, Gross Difference [Abstract] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount Additions/(releases) Financing Receivable And Net Investment In Lease, Allowance For Credit Losses, Expense (Reversal) Financing Receivable And Net Investment In Lease, Allowance For Credit Losses, Expense (Reversal) Total comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Name Measure Name Other comprehensive income/(loss), before tax Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent Income from discontinued operations, net of tax Income from discontinued operations, net of tax Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent 3.750% Notes due 2035 3.750% Notes due 2035 [Member] 3.750% Notes due 2035 Practical expedient, remaining performance obligations Revenue, Remaining Performance Obligation, Optional Exemption, Performance Obligation [true false] Reclassifications and taxes related to items of other comprehensive income Comprehensive Income (Loss) [Table Text Block] Total assets Assets 2027 Finite-Lived Intangible Asset, Expected Amortization, Year One Amortized cost for each class of receivables, by credit quality indicator Financing Receivable, Credit Quality Indicator [Line Items] Other‒divested businesses Other Divested Businesses Excluding Discontinued Operations The amount of pre-tax income from other divested businesses excluding discontinued operations. Japan, Yen Japan, Yen Geographical [Domain] Geographical [Domain] 0.650% Notes due 2032 0.650% Notes due 2032 [Member] Notes bearing 0.650% due 2032. 0.300% Notes due 2026 0.300% Notes due 2026 [Member] Notes bearing 0.300% due 2026. Allowance for credit losses: Financing Receivable, Allowance for Credit Loss [Roll Forward] Cash flows from operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Amortization Life (in years) Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life Other (income) and expense Total other (income) and expense Other Expense and (Income) The aggregate amount of expense and (income), not previously categorized, including interest income, gains and losses on certain derivative instruments, gains and losses from securities and other investments, gains and losses from certain real estate transactions, foreign currency transaction gains and losses, gains and losses from the sale of businesses and amounts related to accretion of asset retirement obligations. 2030 Finite-Lived Intangible Asset, Expected Amortization, Year Four Potential reduction in net position of total derivative assets Derivative Asset, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset Dividend declared (in dollars per share) Common Stock, Dividends, Per Share, Declared Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Total assets acquired Business Combination, Recognized Asset Acquired, Asset (Gains)/Losses Recognized in Earnings and Other Comprehensive Income - Recognized in OCI - Amount excluded from the assessment of effectiveness Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments and Tax Maturing 2030 Maturing 2030 [Member] Borrowings with maturities in 2030. Level 2 Fair Value, Inputs, Level 2 [Member] Foreign currency and other Allowance For Doubtful Accounts Receivable Other Amount of other adjustments impacting the allowance for credit loss, including foreign currency translation adjustments. Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Business Combination [Domain] Business Combination [Domain] Euro floating-rate notes Euro floating-rate notes [Member] Euro floating-rate notes Asset Pledged as Collateral Asset Pledged as Collateral [Member] Reconciliation of segment revenue and profit to IBM as reported Reconciliation of Revenue And Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Tabular disclosure of the reconciliation of total revenues and profit (loss) from reportable segments to the consolidated income (loss) before income tax expense (benefit) and discontinued operations. Includes, but is not limited to, reconciliation after income tax if income tax is allocated to the reportable segment. Schedule of amounts included in the Consolidated Income Statement related to lessor activity Sales-type Lease, Lease Income [Table Text Block] Cost of financing Cost of financing [Member] Primary financial statement caption in which reported facts about the cost of financing have been included. Estimated percent of goodwill deductible for tax purposes Business Acquisition, Purchase Price Allocation Goodwill Expected Tax Deductible Percent The percent of goodwill arising from a business combination that is expected to be deductible for tax purposes. Net investment in lease, current Net Investment in Lease, after Allowance for Credit Loss, Current Document Information [Table] Document Information [Table] PEO PEO [Member] Proceeds from disposition of marketable securities and other investments Proceeds from Sale, Maturity and Collection of Investments U.S. Plans UNITED STATES Changes in warranty liabilities Schedule of Product Warranty Liability [Table Text Block] Contributions by employer - noncash Defined Benefit Plan Contributions By Employer, Noncash Noncash contributions made by the employer during the period to a defined benefit plan. These contributions may be in the form of securities. Retained Earnings Retained Earnings [Member] Share-Based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Cash, cash equivalents and restricted cash at January 1 Cash, cash equivalents and restricted cash at March 31 Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Income Statement [Abstract] Not Designated as Hedging Instrument, Economic Hedge Not Designated as Hedging Instrument, Economic Hedge [Member] Interest expense Interest Expense [Member] Taxes Taxes Payable, Current Beginning Balance Ending Balance Standard Product Warranty Accrual Payments to settle debt Repayment of Long-Term Debt, Long-Term Lease Obligation, and Capital Security Maturing 2052 Maturing 2052 [Member] Borrowings denominated in U.S. dollars with maturities in 2052. Product and Service [Domain] Product and Service [Domain] Equity contracts hedging employee compensation obligations Equity contracts hedging employee compensation obligations [Member] Equity Contract Employee Compensation Hedge [Member] Continuing operations (in dollars per share) Continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Diluted Share Total IBM Stockholders' Equity Parent [Member] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Total liabilities Liabilities, Fair Value Disclosure Business Combination [Table] Business Combination [Table] Notional amount Derivative, Notional Amount Business Combination, Consideration Transferred, Equity Interest, Type [Axis] Business Combination, Consideration Transferred, Equity Interest, Type [Axis] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Financial Assets and Liabilities Not Measured at Fair Value Financial Assets and Liabilities Not Measured At Fair Value [Policy Text Block] Disclosure of accounting policy for financial assets and liabilities not measured at fair value. Business acquisition, purchase price allocation Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block] City Area Code City Area Code Schedule of client financing receivables and allowance for credit losses by class Financing Receivable, Allowance for Credit Loss [Table Text Block] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Interest capitalized Interest Costs Capitalized United States of America, Dollars United States of America, Dollars Schedule of reconciliation of contract balances Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Cash flows from investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Fair Value Hedging Fair Value Hedging [Member] Changes in noncontrolling interests Noncontrolling Interest, Period Increase (Decrease) Recognized actuarial losses Defined Benefit Plan, Amortization of Gain (Loss) SG&A expense Selling, general and administrative Selling, General and Administrative Expenses [Member] Cash Flow Hedging Cash Flow Hedging [Member] Cost of sales Cost of Sales [Member] Goodwill Goodwill Beginning Balance Ending Balance Goodwill Equity contracts Equity Contract [Member] Prepaid Expenses and Other Current Assets Prepaid Expenses and Other Current Assets [Member] Other reportable segment items Schedule of Assets and Other Items by Segment [Table Text Block] This table represents the disclosure of the assets, depreciation/amortization of intangibles, capital expenditures/investments in intangibles, interest income and interest expense for each reportable segment, along with a reconciliation of assets from reportable segments to total consolidated assets. Maturing 2044 Maturing 2044 [Member] Maturing 2044 Interest income on lease receivables Sales-type and Direct Financing Leases, Interest Income Originated two years before latest fiscal year Financing Receivable And Net Investment In Lease Originated Two Years Before Latest Fiscal Year Amortized cost of financing receivable originated two years prior to current fiscal year. Goodwill accumulated impairment losses Goodwill, Impaired, Accumulated Impairment Loss Other Performance Measure, Amount Other Performance Measure, Amount Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Total expense and other (income) Other expense and (income) Expense and (Income), Other The aggregate amount of both recurring costs and income associated with normal operations (except for the portion of these expenses which can be clearly related to production and included in cost of sales, services or financing) and expense (income) from ancillary business-related activities. Includes selling, general and administrative expense, research and development expense, intellectual property and custom development income and interest and debt related expenses (except those related to the financing activities of the entity). Related Party, Type [Domain] Related and Nonrelated Parties [Domain] Other Current Liabilities Other Current Liabilities [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Restricted cash Restricted Cash Earnings per share of common stock: Earnings Per Share Reconciliation [Abstract] Unearned income Financing Receivable, Unamortized Loan Cost (Fee) and Purchase Premium (Discount) Net cash provided by/(used in) investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Duration of expected recognition period for remaining performance obligation 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] Lease income — sales-type and direct financing leases: Lease Income, Lessor, Alternative Presentation [Abstract] Document Fiscal Year Focus Document Fiscal Year Focus Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Operating right-of-use assets — net Operating Lease, Right-of-Use Asset Other Other Operating Segment [Member] Capitalized software Computer Software, Intangible Asset [Member] Unrecognized compensation cost related to non-vested awards, weighted average period of recognition Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Originated four years before latest fiscal year Financing Receivable And Net Investment In Lease Originated Four Years Before Latest Fiscal Year Amortized cost of financing receivable originated four years prior to current fiscal year. Contingencies Legal Matters and Contingencies [Text Block] Total plan contributions Defined Benefit Plan, Defined Contribution Plan and Direct Benefit Payments, Benefit Payments Amount of contributions made by an employer to a defined benefit plan, defined contribution plan, or direct benefit payments, including nonpension postretirement benefits. Maturing 2036 Maturing 2036 [Member] Maturing 2036 Financing receivables to be sold Financing Receivables To Be Sold Represents the amount of financing receivables to be sold in an agreement. The financing receivables may be sold at any one time, on a revolving basis. Segments Segment Reporting Disclosure [Text Block] Schedule of Goodwill [Table] Goodwill [Table] Financial assets and financial liabilities measured at fair value on a recurring basis: Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Trademarks Trademarks [Member] Short-term financing receivables held for investment, allowances Financing Receivable, Allowance for Credit Loss, Current Other Commitments [Line Items] Other Commitments [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Retirement Plan Sponsor Location [Axis] Retirement Plan Sponsor Location [Axis] Intangible asset balances by major asset class Finite-Lived Intangible Assets [Line Items] Maturing 2043 Maturing 2043 [Member] Maturing 2043 Floating Rate Notes due 2028 Floating Rate Notes due 2028 [Member] Floating Rate Notes due 2028 Components of net periodic (income)/cost of the company's retirement-related benefit plans Schedule of Net Benefit Costs [Table Text Block] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Amortization of capitalized software and acquired intangible assets Amortization of Intangible Assets Loans Receivable Loans Receivable [Member] Selling, general and administrative SG&A expense Selling, General and Administrative Expense 0.875% Notes due 2030 0.875% Notes due 2030 [Member] Notes bearing 0.875% due 2030. Deferred taxes Deferred Income Tax Assets, Net Curtailments and settlements Retirement-Related Benefit Plans, Curtailments and Settlements [Member] Accumulated other comprehensive income (loss) related to curtailments and settlements component of defined benefit plans attributable to the parent. Consulting Consulting [Member] Represents information pertaining to Consulting. Exchange [Domain] Exchange [Domain] Accumulated other comprehensive income/(loss) (net of tax) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Other currencies Other Currency [Member] Reconciliation of Contract Balances Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract] Long-term financing receivables (net of allowances of $27 in 2026 and $34 in 2025) Financing Receivable, after Allowance for Credit Loss, Noncurrent Movement in standard warranty liability Movement in Standard Product Warranty Accrual [Roll Forward] Other comprehensive income/(loss), before tax: Other Comprehensive Income (Loss), before Tax [Abstract] 3.800% Notes due 2045 3.800% Notes due 2045 [Member] 3.800% Notes due 2045 Revolving Credit Facility Revolving Credit Facility [Member] Finance lease obligations Finance Lease, Liability Arrangement Duration Trading Arrangement Duration Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Segments [Axis] Segments [Axis] Maturing 2034 Maturing 2034 [Member] Borrowings denominated in U.S. dollars with maturities in 2034. 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Multi-employer plans Multi-Employer Defined Benefit Plan Costs Amount of cost for multi-employer defined benefit plans. Americas Americas [Member] Entity Registrant Name Entity Registrant Name Gains (losses) expected to be reclassified to net income within the next 12 months Cash Flow Hedge Gain (Loss) to be Reclassified within 12 Months Prior service costs/(credits) Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax Retirement Plan Name [Domain] Retirement Plan Name [Domain] Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Total net periodic pension (income)/cost of defined benefit plans Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Total defined benefit pension and defined contribution plans cost recognized in the Consolidated Income Statement Pension Cost (Reversal of Cost) NEW YORK STOCK EXCHANGE, INC. NEW YORK STOCK EXCHANGE, INC. 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Acquired intangibles Acquired intangibles [Member] Represents information pertaining to acquired intangibles. 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Geographical [Axis] Geographical [Axis] Amounts related to cumulative basis adjustments for fair value hedges Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] (Gains)/losses on foreign currency transactions Gain (Loss), Foreign Currency Transaction, before Tax Leases Lessor, Operating Leases [Text Block] Deferred income Deferred income (current) Deferred Revenue, Current Asia Pacific Asia Pacific [Member] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Title of 12(b) Security Title of 12(b) Security Pre-swap annual contractual obligations of long-term debt outstanding Long-Term Debt, Fiscal Year Maturity [Abstract] Other accrued expenses and liabilities Accrued Liabilities and Other Liabilities, Current Current portion of the amount of expenses incurred but not yet paid nor invoiced, and liabilities classified as other. 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Unrealized gains/(losses) arising during the period Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), And Derivative, Excluded Component, Before Reclassification and Tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), And Derivative, Including Excluded Component, Before Reclassification and Tax Divestitures Goodwill, Written off Related to Sale of Business Unit 3.000% Notes due 2031 3.000% Notes due 2031 [Member] 3.000% Notes due 2031 Net gains/(losses) arising during the period Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax Award Timing Disclosures [Line Items] Service cost Defined Benefit Plan, Service Cost Unrealized gains/(losses) arising during the period, Net of Tax Amount Other comprehensive income before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Equity Activity Equity [Text Block] 2024 U.S. Dollar Fixed Rate Notes 2024 U.S. Dollar Fixed Rate Notes [Member] 2024 U.S. Dollar Fixed Rate Notes Revenue, Remaining Performance Obligation, Period [Domain] Revenue, Remaining Performance Obligation, Period [Domain] Revenue, Remaining Performance Obligation, Period [Domain] Net income Net income Net income Net Income (Loss) Attributable to Parent Subsequent Event [Table] Subsequent Event [Table] Roll forward of notes and accounts receivable - trade allowance for credit losses Accounts Receivable, Allowance for Credit Loss [Roll Forward] Number of classes of financing receivable Financing Receivable, Number Of Classes Of Financing Receivable Number of the classes of financing receivables. Classes of financing receivables generally are a disaggregation of a portfolio segment. Segment Information Segment Reporting Information [Line Items] Adoption Date Trading Arrangement Adoption Date Number Of Reportable Segments Not Disclosed Flag Number Of Reportable Segments Not Disclosed Flag NumberOfReportableSegmentsNotDisclosedFlag 6.50% Debentures due 2028 6.50% Debentures due 2028 [Member] Debentures bearing 6.50% due 2028. 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These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Basic (in shares) Weighted-average shares outstanding during period (in shares) Weighted Average Number of Shares Outstanding, Basic Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] 7.00% Debentures due 2045 7.00% Debentures due 2045 [Member] Debentures bearing 7.00% due 2045. 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