Document and Entity Information Document Information [Table] Document Information [Line Items] Document Type Document Quarterly Report Document Transition Report Document Period End Date Entity File Number Entity Registrant Name Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Address, Address Line One Entity Address, City or Town Entity Address, State or Province Entity Address, Postal Zip Code City Area Code Local Phone Number Title of 12(b) Security Trading Symbol Security Exchange Name Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Small Business Entity Emerging Growth Company Entity Shell Company Entity Common Stock, Shares Outstanding Entity Central Index Key Current Fiscal Year End Date Document Fiscal Year Focus Document Fiscal Period Focus Amendment Flag CONSOLIDATED INCOME STATEMENT Statement [Table] Statement [Line Items] Transfers of Financial Assets Equity Activity Revenues * Revenue Revenues Cost of Revenue Cost of services Selling, General and Administrative Expense Selling, general and administrative expenses The amount of expenses related to workforce rebalancing charges. Workforce Rebalancing Costs Workforce rebalancing charges Workforce rebalancing charges Business Combination, Acquisition Related Costs Transaction-related costs Transaction-related costs Interest Expense Interest expense Interest expense The aggregate amount of (income) expense , 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. Other Income and Expense Other expense (income) 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, development and engineering expense, intellectual property and custom development income and interest and debt related expenses (except those related to the financing activities of the entity). Expense and Other Income Total costs and expenses Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income (loss) before income taxes Income Tax Expense (Benefit) Provision for income taxes Profit Loss Net income (loss) Net income (loss) Net income (loss) on which basic and diluted earnings per share is calculated NET LOSS PER SHARE Earnings Per Share, Basic Basic earnings (loss) per share Basic earnings (loss) per share (in dollars per share) Earnings Per Share, Diluted Diluted earnings (loss) per share Diluted earnings (loss) per share (in dollars per share) Weighted Average Number of Shares Outstanding, Basic Number of shares on which basic earnings per share is calculated Weighted-average basic shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Number of shares on which diluted earnings per share is calculated Weighted-average diluted shares outstanding (in shares) Related Party [Axis] Related Party [Domain] Related Party CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) Other Comprehensive Income (Loss), before Tax [Abstract] Other comprehensive income (loss), before tax: Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax, Portion Attributable to Parent Foreign currency translation adjustments Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax Unrealized gains (losses) arising during the period Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax Reclassification of (gains) losses to net income Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax, Parent Total unrealized gains (losses) on cash flow hedges Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, [Abstract] Retirement-related benefit plans: Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax Amortization of prior service (credits) costs Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax Amortization of net (gains) losses Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, Portion Attributable to Parent Total retirement-related benefit plans Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent Other comprehensive income (loss), before tax Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Income tax (expense) benefit related to items of other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other comprehensive income (loss), net of tax Comprehensive Income (Loss), Net of Tax, Attributable to Parent Total comprehensive income (loss) CONSOLIDATED BALANCE SHEET Assets [Abstract] Assets: Assets, Current [Abstract] Current assets: Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Restricted Cash Restricted cash Accounts Receivable, Net, Current Accounts receivable (net of allowances for credit losses of $28 at September 30, 2023 and $32 at March 31, 2023) Accounts receivable (net of allowances for credit losses of $28 at September 30, 2023 and $32 at March 31, 2023) Capitalized Contract Cost, Net, Current Deferred costs (current portion) Deferred costs, current Prepaid Expense and Other Assets, Current Prepaid expenses and other current assets Assets, Current Total current assets Property, Plant and Equipment, Net Property and equipment, net Operating Lease, Right-of-Use Asset Operating right-of-use assets, net Capitalized Contract Cost, Net, Noncurrent Deferred costs (noncurrent portion) Deferred costs, noncurrent Deferred Income Tax Assets, Net Deferred taxes Goodwill Ending Balance Beginning Balance Goodwill Finite-Lived Intangible Assets, Net Intangible assets, net Net Carrying Amount Defined Benefit Plan, Assets for Plan Benefits, Noncurrent Pension assets Other Assets Other noncurrent assets Assets Total assets Liabilities and Equity [Abstract] Liabilities and equity Liabilities [Abstract] Liabilities: Liabilities, Current [Abstract] Current liabilities: Accounts Payable, Current Accounts payable Sales and Excise Tax Payable, Current Value-added tax and income tax liabilities Short-term Debt Current portion of long-term debt Employee-related Liabilities, Current Accrued compensation and benefits Deferred Revenue, Current Deferred income (current portion) Deferred income (current) Operating Lease, Liability, Current Operating lease liabilities (current portion) Accrued Liabilities, Current Accrued contract costs Current portion of the amount of expenses incurred but not yet paid nor invoiced, and liabilities classified as other. Accrued Liabilities and Other Liabilities, Current Other accrued expenses and liabilities Liabilities, Current Total current liabilities Long-term Debt and Lease Obligation Long-term debt Total Noncurrent liability for retirement and nonpension postretirement benefit Retirement and nonpension postretirement benefit obligations Deferred Revenue, Noncurrent Deferred income (noncurrent portion) Deferred income (noncurrent) Operating Lease, Liability, Noncurrent Operating lease liabilities (noncurrent portion) Other Liabilities, Noncurrent Other noncurrent liabilities Total liabilities Total liabilities Commitments and contingencies Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Stockholders' equity Common Stocks, Including Additional Paid in Capital Common stock, par value $0.01 per share, and additional paid-in capital (shares authorized: 1,000.0; shares issued: September 30, 2023 - 232.2, March 31, 2023 - 229.6) Retained Earnings (Accumulated Deficit) Accumulated deficit Treasury Stock, Value Treasury stock, at cost (shares: September 30, 2023 - 2.8, March 31, 2023 - 1.9) Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive income (loss) Stockholders' Equity Attributable to Parent Total stockholders' equity before non-controlling interests Stockholders' Equity Attributable to Noncontrolling Interest Non-controlling interests Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Balance at the end of the period Balance at the beginning of the period Total equity Liabilities and Equity Total liabilities and equity Allowance for Doubtful Accounts Receivable, Current Notes and accounts receivable - trade, allowances Accounts receivable, allowances Common Stock, Par or Stated Value Per Share Common Stock, Par value (in dollars per share) Common Stock, Shares Authorized Common Stock, Shares authorized (in shares) Common Stock, Shares, Issued Common Stock, Shares issued (in shares) Treasury Stock, Shares Treasury Stock (in shares) CONSOLIDATED STATEMENT OF CASH FLOWS Net Cash Provided by (Used in) Operating Activities [Abstract] Cash flows from operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income (loss) to cash provided by operating activities: Depreciation Depreciation of property, equipment and capitalized software Depreciation of property, equipment and capitalized software Operating Lease, Right-of-Use Asset, Amortization Expense Depreciation of right-of-use assets Amount of amortization of transition costs and prepaid software. Amortization of Transition Costs and Prepaid Software Amortization of transition costs and prepaid software Capitalized Contract Cost, Amortization Amortization of deferred costs Amortization of capitalized contract costs Amortization of Intangible Assets Amortization of acquisition-related intangible assets Share-based Compensation Stock-based compensation expense Stock-based compensation Deferred Income Tax Expense (Benefit) Deferred taxes Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee, and amount of income (expense) included in net income that results in no cash inflow (outflow), classified as other. Gain (Loss) on Disposition of Assets and Other Net (gain) loss on asset sales and other Increase (Decrease) in Operating Capital [Abstract] Change in operating assets and liabilities: Increase (Decrease) in Deferred Charges Deferred costs (excluding amortization) Amount of increase decrease in right of use assets and liabilities. Increase (Decrease) in Right Of Use Assets And Liabilities Right-of-use assets and liabilities (excluding depreciation) Amount of increase (decrease) in workforce rebalancing. Increase Decrease In Workforce Rebalancing Workforce rebalancing liabilities Increase (Decrease) in Accounts Receivable Receivables Increase (Decrease) in Accounts Payable Accounts payable Increase (Decrease) in Income Taxes Payable Taxes Increase (Decrease) in Other Operating Assets and Liabilities, Net Other assets and other liabilities Net Cash Provided by (Used in) Operating Activities Net cash provided by (used in) operating activities Net Cash Provided by (Used in) Investing Activities [Abstract] Cash flows from investing activities: Payments to Acquire Property, Plant, and Equipment Capital expenditures Payment for purchase of hardware from IBM Proceeds from Sale of Property, Plant, and Equipment Proceeds from disposition of property and equipment Payments for (Proceeds from) Other Investing Activities Other investing activities, net Net Cash Provided by (Used in) Investing Activities Net cash used in investing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Cash flows from financing activities: Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities Debt repayments Payments Related to Tax Withholding for Share-based Compensation Common stock repurchases for tax withholdings Proceeds from (Payments for) Other Financing Activities Other financing activities, net Net Cash Provided by (Used in) Financing Activities Net cash provided by (used in) financing activities Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Effect of exchange rate changes on cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Net change in cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, cash equivalents and restricted cash at end of period Cash, cash equivalents and restricted cash at beginning of period Supplemental Cash Flow Information [Abstract] Supplemental data Income Taxes Paid, Net Income taxes paid, net of refunds received Interest Paid, Excluding Capitalized Interest, Operating Activities Interest paid on debt CONSOLIDATED STATEMENT OF EQUITY Equity Components [Axis] Equity Component [Domain] Parent Common Stock and Additional Paid-In Capital Accumulated Other Comprehensive Income (Loss) Treasury Stock Accumulated Deficit Non-Controlling Interests Increase (Decrease) in Stockholders' Equity [Roll Forward] Equity Shares, Outstanding Balance at the end of the period (in shares) Balance at the beginning of the period (in shares) Other Comprehensive Income (Loss), Net of Tax Other comprehensive income (loss) Other comprehensive income (loss) Other comprehensive income (loss), net of tax Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture Common stock issued under employee plans Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture Common stock issued under employee plans (in shares) Stock Repurchased During Period, Value Purchases of treasury stock Stock Repurchased During Period, Shares Purchases of treasury stock (in shares) Noncontrolling Interest, Period Increase (Decrease) Changes in non-controlling interests SIGNIFICANT ACCOUNTING POLICIES Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] SIGNIFICANT ACCOUNTING POLICIES ACCOUNTING PRONOUNCEMENTS Accounting Changes and Error Corrections [Text Block] ACCOUNTING PRONOUNCEMENTS REVENUE RECOGNITION Revenue from Contract with Customer [Text Block] REVENUE RECOGNITION SEGMENTS Segment Reporting Disclosure [Text Block] SEGMENTS TAXES Income Tax Disclosure [Text Block] TAXES Earnings Per Share [Text Block] NET LOSS PER SHARE FINANCIAL ASSETS AND LIABILITIES Financial Instruments Disclosure [Text Block] FINANCIAL ASSETS AND LIABILITIES INTANGIBLE ASSETS INCLUDING GOODWILL Goodwill and Intangible Assets Disclosure [Text Block] INTANGIBLE ASSETS INCLUDING GOODWILL BORROWINGS Debt Disclosure [Text Block] BORROWINGS COMMITMENTS AND CONTINGENCIES. Commitments and Contingencies Disclosure [Text Block] COMMITMENTS AND CONTINGENCIES EQUITY Stockholders' Equity Note Disclosure [Text Block] EQUITY RETIREMENT-RELATED BENEFITS Pension and Other Postretirement Benefits Disclosure [Text Block] RETIREMENT-RELATED BENEFITS TRANSACTIONS WITH FORMER PARENT Related Party Transactions Disclosure [Text Block] TRANSACTIONS WITH FORMER PARENT WORKFORCE REBALANCING AND SITE-RATIONALIZATION CHARGES. Restructuring and Related Activities Disclosure [Text Block] WORKFORCE REBALANCING AND SITE-RATIONALIZATION CHARGES Basis of Accounting, Policy [Policy Text Block] Basis of Presentation Consolidation, Policy [Policy Text Block] Principles of Consolidation Use of Estimates, Policy [Policy Text Block] Use of Estimates New Accounting Pronouncements, Policy [Policy Text Block] Recent Pronouncements Segment Reporting, Policy [Policy Text Block] Segments Contract with Customer, Asset and Liability [Table Text Block] Schedule of reconciliation of contract balances Accounts Receivable, Allowance for Credit Loss [Table Text Block] Schedule of notes and accounts receivable - trade allowance for credit losses Capitalized Contract Cost [Table Text Block] Schedule of capitalized costs to acquire and fulfill customer contracts Schedule of Segment Reporting Information, by Segment [Table Text Block] Summary of results of segments Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Summary of reconciliation of adjusted EBITDA to consolidated pretax income (loss) Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of computation of basic and diluted earnings per share of common stock Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Schedule of anti dilutive securities were not included in the computation of diluted earnings (loss) per share Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Financial assets and financial liabilities measured at fair value on a recurring basis Derivative Instruments, Gain (Loss) [Table Text Block] Effect of Derivative Instruments in the Consolidated Income Statement - Designated Derivatives Not Designated as Hedging Instruments [Table Text Block] Effect of Derivative Instruments in the Consolidated Income Statement- Non designated Schedule of Finite-Lived Intangible Assets [Table Text Block] Intangible asset balances by major asset class Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Intangible assets, future amortization expense Schedule of Goodwill [Table Text Block] Changes in goodwill balances by reportable segment Schedule of Long-term Debt Instruments [Table Text Block] Summary of components of debt Schedule of Maturities of Long-term Debt [Table Text Block] Schedule of contractual obligations of long-term debt outstanding Comprehensive Income (Loss) [Table Text Block] Reclassifications and taxes related to items of other comprehensive income (loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Accumulated other comprehensive income (loss), net of taxes Schedule of Net Benefit Costs [Table Text Block] Components of net periodic pension cost for the defined benefit pension plans Restructuring and Related Costs [Table Text Block] Schedule of segment breakout of charges Schedule of Restructuring Reserve by Type of Cost [Table Text Block] Summary of classification of workforce rebalancing and site-rationalization activities Tabular disclosure of components of and changes in restructuring charges. Schedule of Components of and Changes in Restructuring Charges [Table Text Block] Schedule of components of and changes in workforce rebalancing and site-rationalization charges Range [Axis] Range [Domain] Minimum Number of Countries in which Entity Operates Number of countries The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity transferred. Minority Interest Ownership Percentage By Non-controlling Owners, Transferred Ownership interest transferred Revenue, Remaining Performance Obligation Remaining performance obligations related to customer contracts that are unsatisfied or partially unsatisfied Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Remaining Performance Obligations The percentage of the remaining performance obligation that is expected to be recognized in the period. Revenue, Remaining Performance Obligation, Expected Timing Percentage Percentage of remaining performance obligation expected to be recognized Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Duration of expected recognition period for remaining performance obligation Contract with Customer, Performance Obligation Satisfied in Previous Period Impact to revenue from performance obligations satisfied (or partially satisfied) in previous periods Contract with Customer, Asset and Liability [Abstract] Reconciliation of Contract Balances Contract with Customer, Asset, Net, Current Contract assets Unbilled Receivables, Current Unbilled receivable Contract with Customer, Liability, Revenue Recognized Revenue recognized that was included in deferred income at the beginning of the period New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Accounting Changes Accounts Receivable, Allowance for Credit Loss [Roll Forward] Roll forward of notes and accounts receivable - trade allowance for credit losses Accounts Receivable, Allowance for Credit Loss Allowance for Credit Loss, Ending Balance Allowance for Credit Loss, Beginning Balance Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) Additions (releases) Accounts Receivable, Allowance for Credit Loss, Writeoff Write-offs Amount of other adjustments impacting the allowance for credit loss. Allowance For Doubtful Accounts Receivable Other Other Concentration Risk [Table] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Revenue. Accounts Receivable. Concentration Risk [Line Items] The number of clients which could create risks that arise due to the volume of business transacted. Concentration Risk Major Clients Concentration risk, major clients Capitalized Contract Cost [Table] Maximum Capitalized Contract Cost [Axis] Capitalized Contract Cost [Domain] Information pertaining to deferred transition costs. Deferred transition costs Information pertaining to prepaid software costs. Prepaid software costs Information pertaining to capitalized costs relating to contracts. Capitalized contract costs Information pertaining to capitalized costs to fulfill contracts. Capitalized costs to fulfill contracts Information pertaining to capitalized costs to obtain contracts. Capitalized costs to obtain contracts Capitalized Contract Cost [Line Items] Deferred Contract Costs Term of contract with customer. Term Of Contract With Customer Term of contract with customer Capitalized Contract Cost, Net Deferred costs Amount of amortization of deferred costs. Amortization Of Deferred Costs Total deferred costs amortized Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Segment Reporting Information [Line Items] Segment Information Number of Reportable Segments Number of reportable segments Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Represents information relating to United states segment. United States United States. Represents information relating to Japan segment. Japan Japan. Represents information relating to Principal markets segment. Principal Markets Principal Markets Represents information relating to strategic markets segment. Strategic Markets Strategic Markets Profit (loss) of the company before expenses, taxes, depreciation, and amortization and other adjustments. Adjusted Earnings Before Interest, Taxes, Depreciation, and Amortization Segment adjusted EBITDA Restructuring and Related Cost, Accelerated Depreciation Charges related to ceasing to use leased / fixed assets and lease terminations Amortization Amortization expense The amount of corporate expense not allocated to segments. Corporate Expense Not Allocated to Segments Corporate expense not allocated to the segments The amount of significant litigation costs and pension costs other than pension servicing costs and multi-employer plan costs. Other Adjustments Other adjustments Effective Income Tax Rate Reconciliation, Percent Effective tax rate (as a percent) Common Stock, Dividends, Per Share, Declared Stock dividends declared Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Weighted-average shares outstanding during period Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Restricted stock units Performance-based stock units Performance-conditioned stock units Represents information relating to market conditioned performance awards. Market-conditioned performance awards Market-conditioned stock units Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Securities not included in the computation of diluted earnings (loss) per share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Anti dilutive securities Derivative Instruments, Gain (Loss) [Table] Hedging Designation [Axis] Hedging Designation [Domain] Designated as hedging instruments Not Designated as Hedging Instrument [Member] Not designated as hedging instruments - economic hedges Derivative Instrument [Axis] Derivative Contract [Domain] Foreign exchange contracts Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Level 2 Derivative Instruments, Gain (Loss) [Line Items] Derivative Asset Derivative assets Derivative Asset, Statement of Financial Position [Extensible Enumeration] Derivative Liability Derivative liabilities Derivative Liability, Statement of Financial Position [Extensible Enumeration] Fair Value, Net Asset (Liability) Fair value, net Fair Value Measurements, Recurring and Nonrecurring [Table] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Cash and cash equivalents Financial Instrument [Axis] Financial Instruments [Domain] Represents information pertaining to time deposits issued. Time deposits Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Financial assets and financial liabilities: Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement Derivative assets impacted by netting arrangements Asset Impairment Charges Impairments of non-financial assets Long-term Debt, Excluding Current Maturities Long-term debt Long-term Debt, Fair Value Long-term debt, fair value The amount received from sale of receivables to third parties Proceeds From Third Parties, Financing Receivables Gross proceeds from third parties The amount represents fees and the net gains and losses associated with transfer of receivables Financing Receivable Fees And Net Gain Losses Fees associated with the transfers of receivables Debt Securities, Available-for-Sale Available-for-sale debt securities Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Hedging Relationship [Axis] Hedging Relationship [Domain] Derivative instruments in cash flow hedges Currency swaps Foreign exchange forward contracts Derivatives, Fair Value [Line Items] Derivative, Notional Amount Notional amount Maximum Length of Time Hedged in Cash Flow Hedge Maximum length of time hedged Derivative, Average Remaining Maturity Weighted average remaining maturity Derivative, Gain on Derivative Net gains from derivatives Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net Deferred net gains on derivatives reclassified to net income Derivative, Term of Contract Term of contract Derivative, Gain (Loss) on Derivative, Net Net gains (loss) from derivatives Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] OCI, before Reclassifications, before Tax, Attributable to Parent Gain (Loss) Recognized in Earnings and Other Comprehensive Income - Recognized in OCI Reclassification from AOCI, Current Period, before Tax, Attributable to Parent Gain (Loss) Recognized in Earnings and Other Comprehensive Income - Reclassified from AOCI Derivative, Excluded Component, Gain (Loss), Recognized in Earnings Gain (Loss) Recognized in Earnings and Other Comprehensive Income - Amounts Excluded from Effectiveness Testing Schedule of Finite-Lived Intangible Assets [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Capitalized software Customer relationships Completed technology 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. Patents and trademarks Finite-Lived Intangible Assets [Line Items] Intangible asset balances by major asset class Finite-Lived Intangible Assets, Gross Gross Carrying Amount Finite-Lived Intangible Assets, Accumulated Amortization Accumulated Amortization 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. Amortization Of Intangible Assets Net Of Currency Impact Intangible asset amortization expense Finite-Lived Intangible Assets, Period Increase (Decrease) Net carrying amount of intangible assets increased Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Future amortization expense, by year Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 2024 (remaining six months) Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 2025 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2026 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2027 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2028 Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in after fourth fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach) Finite Lived Intangible Assets Amortization Expense Year After Year Four Thereafter Schedule of Goodwill [Table] Goodwill [Line Items] Goodwill Goodwill [Roll Forward] Changes in Goodwill Balances Goodwill, Impairment Loss Impairment Goodwill, Translation and Purchase Accounting Adjustments Additions and Other Adjustments Schedule of Long-term Debt Instruments [Table] Debt Instrument [Axis] Debt Instrument, Name [Domain] Represents information pertaining to Unsecured floating-rate term loan 1.37%, Maturing 1st November 2024. Unsecured floating-rate term loan Represents information pertaining to Commercial loan agreement, 3.00% maturing 1st July 2026. Commercial loan agreement Represents information pertaining to Unsecured senior notes, 2.05%, 15th October 2026. Unsecured senior notes due 2026 Represents information pertaining to Unsecured senior notes, 2.70%, 15th October 2028. Unsecured senior notes due 2028 Represents information pertaining to Unsecured senior notes due in 2031. Unsecured senior notes due 2031 Represents information pertaining to Unsecured senior notes due in 2041. Unsecured senior notes due 2041 Variable Rate [Axis] Variable Rate [Domain] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] SOFR Debt Instrument [Line Items] BORROWINGS It represents the amount of debt excluding finance lease obligations. Debt Instrument Carrying Amount Excluding Finance Lease Obligations Long-term debt Finance Lease, Liability, Payment, Due Financing lease obligations Long-term Debt and Lease Obligation, Including Current Maturities Total Debt Instrument, Unamortized Discount Less: Unamortized discount Debt Issuance Costs, Net Less: Unamortized debt issuance costs Long-term Debt and Lease Obligation, Current Less: Current maturities of long-term debt Long-term Debt, Weighted Average Interest Rate, at Point in Time Debt instrument, weighted-average interest rate (as a percent) Represents the weighted average interest rate on finance lease. Finance Lease, Weighted Average Interest Rate Finance lease obligations, interest rate (as a percent) Long-term Debt, Fiscal Year Maturity [Abstract] Pre-swap annual contractual obligations of long-term debt outstanding Long-Term Debt, Maturity, Year One 2024 (remaining six months) Long-Term Debt, Maturity, Year Two 2025 Long-Term Debt, Maturity, Year Three 2026 Long-Term Debt, Maturity, Year Four 2027 Long-Term Debt, Maturity, after Year Five Thereafter Long-term Debt, Gross Total Line of Credit Facility [Table] Credit Facility [Axis] Credit Facility [Domain] Revolving Credit Facility Revolving Credit Agreement Line of Credit Facility [Line Items] BORROWINGS Line of Credit Facility, Current Borrowing Capacity Borrowing credit facility Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Right-of-use assets obtained in exchange for new finance lease liabilities Amount of extinguishment of finance lease obligations. Extinguishment Of Finance Lease Obligations Extinguishment of certain finance lease obligations Loss Contingencies [Table] Litigation Case [Axis] Litigation Case [Domain] Litigation initiated by the BMC Software, Inc. (BMC) against IBM. BMC v. IBM Represents the information pertaining to INTERNATIONAL BUSINESS MACHINES CORP. IBM Loss Contingencies [Line Items] Loss Contingencies Entity Number of Employees Number of employees The value (monetary amount) of the direct damage awards the plaintiff seeks in the legal matter. Loss Contingency Direct Damages Sought Value Direct damages sought, value The value (monetary amount) of the punitive damage awards the plaintiff seeks in the legal matter. Loss Contingency Punitive Damages Sought Value Punitive damages sought, value Accumulated Other Comprehensive Income (Loss) [Table] Foreign Currency Translation Adjustments Unrealized Gains (Losses) on Cash Flow Hedges Net Change Retirement-Related Benefit Plans Retirement-Related Benefit Plans, Prior Service Costs (Credits) Retirement-Related Benefit Plans, Net Gains (Losses) Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) (net of tax) Reclassifications and Taxes Related to Items of Other Comprehensive Income (Loss) Other Comprehensive Income (Loss), before Reclassifications, before Tax Unrealized gains (losses) arising during the period, before tax amount Other Comprehensive Income (Loss) before Reclassifications, Tax Unrealized gains (losses) arising during the period, tax (expense) benefit Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Unrealized gains (losses) arising during the period, net of tax amount Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax Reclassification/amortization, before tax amount Reclassification from AOCI, Current Period, Tax Reclassification/amortization, tax (expense) benefit Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Reclassification/amortization, net of tax amount Other Comprehensive Income (Loss), before Tax Other comprehensive income (loss), before tax amount Other Comprehensive Income (Loss), Tax Other comprehensive income (loss), tax (expense) benefit Disclosures about retirement-related benefit plans including defined benefit pension plans, defined contribution pension plans and non-pension postretirement plans. Schedule of Retirement Related Benefit Plans Disclosures [Table] Retirement Plan Type [Axis] Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] Defined Benefit Pension Plans Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Retirement-Related Benefit Plans Disclosures [Line Items] Cost/(Income) of Pension Plans Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan, including costs of related party from spin-off. Defined Benefit Plan Service Cost, Including Related Party Service cost Amount of cost recognized for passage of time related to defined benefit plan. including costs of related party from spin-off. Defined Benefit Plan Interest Cost, Including Related Party Interest cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible List] Interest cost - income statement location Defined Benefit Plan, Expected Return on Plan Assets Expected return on plan assets Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible List] Expected return on plan assets - income statement location Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Amortization of prior service costs (credits) Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization of Prior Service Cost (Credit), Statement of Income or Comprehensive Income [Extensible List] Amortization of prior service costs/(credits) - income statement location Defined Benefit Plan, Amortization of Gains (Losses) Recognized actuarial losses (gains) Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible List] Recognized actuarial losses (gains) - income statement location Defined Benefit Plan, Net Periodic Benefit Cost Total net periodic pension cost Schedule of Related Party Transactions, by Related Party [Table] Counterparty Name [Axis] Counterparty Name [Domain] Related Party Transaction [Axis] Related Party Transaction [Domain] Represents the information pertaining to hardware, software and services. Hardware, software and services Related Party Transaction [Line Items] Related Party Transaction, Due from (to) Related Party Due from related party Period of time in which a related party will continue to provide hardware upgrades at no cost. Related Party, Upgraded Hardware Period Upgraded hardware period Related Party Transaction, Purchases from Related Party Purchases from related party Property, Plant and Equipment, Useful Life Estimated useful lives (in years) Amount of operating lease liability guaranteed by related party. Operating Lease, Liability Guaranteed By Related Party Lease liability guaranteed by IBM Schedule of Restructuring and Related Costs [Table] Consolidation Items [Axis] Consolidation Items [Domain] Business Segments Operating Segments Corporate, Non-Segment [Member] Corporate, Non-Segment Restructuring Type [Axis] Type of Restructuring [Domain] Represents the information pertaining to Workforce rebalancing charges Workforce Rebalancing Charges [Member] Workforce Rebalancing Charges Represents the information pertaining to charges related to ceasing to use leases assets Charges Related to Ceasing to Use Leased Assets [Member] Charges Related to Ceasing to Use Leased Assets Restructuring Cost and Reserve [Line Items] RESTRUCTURING Restructuring Charges Charges Restructuring and Related Cost, Expected Cost Restructuring and related expected costs Income Statement Location [Axis] Income Statement Location [Domain] Cost of services Cost of service Selling, general and administrative expense. Represents the information pertaining to workforce rebalancing charges (benefits). Workforce Rebalancing Charges (Benefits) [Member] Workforce rebalancing charges (benefits) Represents the information pertaining to charges related to lease terminations. Charges Related to Lease Terminations [Member] Charges Related to Lease Terminations Represents the information pertaining to charges related to ceasing to use fixed assets. Charges Related to Ceasing to Use Fixed Assets [Member] Charges Related to Ceasing to Use Fixed Assets Represents the information pertaining to workforce rebalancing liabilities that were inherited from the former Parent. Workforce Rebalancing Liabilities Inherited from Former Parent Restructuring Reserve Balance at end of period Balance at beginning of period Payments for Restructuring Cash payments The amount of non cash adjustments in restructuring charges. Restructuring charges, Non Cash Adjustments Non-cash adjustments Carrying amount as of the balance sheet date pertaining to historic workforce rebalancing liabilities. Historic Workforce Rebalancing Liabilities Historic workforce rebalancing liabilities N/A Rule10b51ArrModified [Flag] Rule 10b5-1 Arrangement Modified N/A NonRule10b51ArrModified [Flag] Non-Rule 10b5-1 Arrangement Modified