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Taxes (Income before Income Taxes) (Details 2) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income from continuing operations before income taxes      
U.S. operations $ 7,509us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ 7,577us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic [1] $ 10,306us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic [1]
Non-U.S. operations 12,477us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 12,667us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign [1] 12,234us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign [1]
Income from continuing operations before income taxes 19,986us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 20,244us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest [1] 22,540us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest [1]
Income tax contingencies      
Reductions for tax positions of prior years 579us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions 2,201us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions 425us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Japan Tax Authorities      
Income tax contingencies      
Unrecognized tax benefit on certain foreign tax losses appealed with taxing authority 1,000ibm_IncomeTaxAppealsTaxBenefitOnForeignTaxLosses
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_NationalTaxAgencyJapanMember		    
Reductions for tax positions of prior years $ 141us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_NationalTaxAgencyJapanMember		    
[1]
Reclassifed to reflect discontinued operation presentation.