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Intangible Assets Including Goodwill (Details 2) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Future amortization expense, by year  
2015 $ 1,068us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
2016 816us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2017 559us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2018 349us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2019 210us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Capitalized Software  
Future amortization expense, by year  
2015 420us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
2016 211us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
2017 65us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
Acquired Intangibles  
Future amortization expense, by year  
2015 648us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ibm_AcquiredIntangiblesMember
2016 605us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ibm_AcquiredIntangiblesMember
2017 494us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ibm_AcquiredIntangiblesMember
2018 349us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ibm_AcquiredIntangiblesMember
2019 $ 210us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ibm_AcquiredIntangiblesMember