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Taxes (Reconciliation of Tax Rates Narratives) (Details 6)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Effective income tax rate reconciliation, additional disclosures    
Increase (decrease) in effective income tax rate 4.60%ibm_IncreaseDecreaseInContinuingOperationsEffectiveIncomeTaxRate  
Completion of the domestic tax audit and assiciated reserve redeterminations 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlementsDomestic 11.10%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlementsDomestic
Retroactive impact of the 2012 American Taxpayer Relief Act 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsOther 0.70%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsOther
Reassessment of certain valuation allowance on deferred tax assets 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 1.40%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Resolution of certain non-US tax audits 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlementsForeign 0.70%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlementsForeign
Newly enacted U.S. state legislation 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate 0.60%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate
Tax charge related to the divestiture of the industry standard server business 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationDispositionOfBusiness 0.90%us-gaap_EffectiveIncomeTaxRateReconciliationDispositionOfBusiness
Reduction in tax charges related to certain intercompany payments made by foreign subsidiaries and the licensing of certain intellectual property 3.70%ibm_EffectiveIncomeTaxRateReconciliationIntercompanyPaymentsMadeByForeignSubsidiariesAndLicensingOfIntellectualProperty  
Foreign tax credits 4.70%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsForeign  
Favorable geographic mix of pre-tax income 2.50%ibm_EffectiveIncomeTaxRateReconciliationFavorableMixOfPreTaxIncome