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Financing Receivables (Details 6) (Global Financing, Financing Receivable Portfolio)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Financial Industry
    
Financing Receivables by Portfolio Segment    
Financing receivables (as a percent) 40.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= naics_ZZ52
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_LoansAndFinanceReceivablesMember
/ us-gaap_StatementBusinessSegmentsAxis
= ibm_GlobalFinancingMember		 39.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= naics_ZZ52
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_LoansAndFinanceReceivablesMember
/ us-gaap_StatementBusinessSegmentsAxis
= ibm_GlobalFinancingMember
Government Industry
    
Financing Receivables by Portfolio Segment    
Financing receivables (as a percent) 13.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= us-gaap_GovernmentMember
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_LoansAndFinanceReceivablesMember
/ us-gaap_StatementBusinessSegmentsAxis
= ibm_GlobalFinancingMember		 14.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= us-gaap_GovernmentMember
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_LoansAndFinanceReceivablesMember
/ us-gaap_StatementBusinessSegmentsAxis
= ibm_GlobalFinancingMember
Manufacturing Industry
    
Financing Receivables by Portfolio Segment    
Financing receivables (as a percent) 14.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= sic_Z2000toZ3999
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_LoansAndFinanceReceivablesMember
/ us-gaap_StatementBusinessSegmentsAxis
= ibm_GlobalFinancingMember		 14.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= sic_Z2000toZ3999
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_LoansAndFinanceReceivablesMember
/ us-gaap_StatementBusinessSegmentsAxis
= ibm_GlobalFinancingMember
Retail Industry
    
Financing Receivables by Portfolio Segment    
Financing receivables (as a percent) 8.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= sic_Z5200toZ5999
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_LoansAndFinanceReceivablesMember
/ us-gaap_StatementBusinessSegmentsAxis
= ibm_GlobalFinancingMember		 8.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= sic_Z5200toZ5999
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_LoansAndFinanceReceivablesMember
/ us-gaap_StatementBusinessSegmentsAxis
= ibm_GlobalFinancingMember
Services Industry
    
Financing Receivables by Portfolio Segment    
Financing receivables (as a percent) 9.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= sic_Z7000toZ9999
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_LoansAndFinanceReceivablesMember
/ us-gaap_StatementBusinessSegmentsAxis
= ibm_GlobalFinancingMember		 8.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= sic_Z7000toZ9999
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_LoansAndFinanceReceivablesMember
/ us-gaap_StatementBusinessSegmentsAxis
= ibm_GlobalFinancingMember
Healthcare Industry
    
Financing Receivables by Portfolio Segment    
Financing receivables (as a percent) 5.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= naics_ZZ62
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_LoansAndFinanceReceivablesMember
/ us-gaap_StatementBusinessSegmentsAxis
= ibm_GlobalFinancingMember		 6.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= naics_ZZ62
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_LoansAndFinanceReceivablesMember
/ us-gaap_StatementBusinessSegmentsAxis
= ibm_GlobalFinancingMember
Communications Industry
    
Financing Receivables by Portfolio Segment    
Financing receivables (as a percent) 6.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= ibm_CommunicationsMember
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_LoansAndFinanceReceivablesMember
/ us-gaap_StatementBusinessSegmentsAxis
= ibm_GlobalFinancingMember		 6.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= ibm_CommunicationsMember
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_LoansAndFinanceReceivablesMember
/ us-gaap_StatementBusinessSegmentsAxis
= ibm_GlobalFinancingMember
Other industries
    
Financing Receivables by Portfolio Segment    
Financing receivables (as a percent) 5.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= ibm_OtherIndustryMember
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_LoansAndFinanceReceivablesMember
/ us-gaap_StatementBusinessSegmentsAxis
= ibm_GlobalFinancingMember		 4.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= ibm_OtherIndustryMember
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_LoansAndFinanceReceivablesMember
/ us-gaap_StatementBusinessSegmentsAxis
= ibm_GlobalFinancingMember