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Rental Expense and Lease Commitments (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Rental expense $ 1,592ibm_RentalExpense $ 1,759ibm_RentalExpense $ 1,767ibm_RentalExpense
Operating lease commitments      
Gross minimum rental commitments (including vacant space below) for 2015 1,350us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
Gross minimum rental commitments (including vacant space below) for 2016 1,161us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
Gross minimum rental commitments (including vacant space below) for 2017 988us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
Gross minimum rental commitments (including vacant space below) for 2018 848us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
Gross minimum rental commitments (including vacant space below) for 2019 754us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
Gross minimum rental commitments (including vacant space below) beyond 2019 1,051us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Vacant space for 2015 24ibm_OperatingLeasesVacantSpaceFutureMinimumPaymentsDueCurrent    
Vacant space for 2016 9ibm_OperatingLeasesVacantSpaceFutureMinimumPaymentsDueInTwoYears    
Vacant space for 2017 6ibm_OperatingLeasesVacantSpaceFutureMinimumPaymentsDueInThreeYears    
Vacant space for 2018 2ibm_OperatingLeasesVacantSpaceFutureMinimumPaymentsDueInFourYears    
Vacant space for 2019 0ibm_OperatingLeasesVacantSpaceFutureMinimumPaymentsDueInFiveYears    
Sublease income commitments for 2015 12us-gaap_FutureMinimumSubleaseRentalsSaleLeasebackTransactionsWithinOneYear    
Sublease income commitments for 2016 10us-gaap_FutureMinimumSubleaseRentalsSaleLeasebackTransactionsWithinTwoYears    
Sublease income commitments for 2017 8us-gaap_FutureMinimumSubleaseRentalsSaleLeasebackTransactionsWithinThreeYears    
Sublease income commitments for 2018 6us-gaap_FutureMinimumSubleaseRentalsSaleLeasebackTransactionsWithinFourYears    
Sublease income commitments for 2019 5us-gaap_FutureMinimumSubleaseRentalsSaleLeasebackTransactionsWithinFiveYears    
Sublease income commitments beyond 2019 6us-gaap_FutureMinimumSubleaseRentalsSaleLeasebackTransactionsThereafter    
Capital lease commitments      
Capital lease commitments for 2015 13us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent    
Capital lease commitments for 2016 7us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears    
Capital lease commitments for 2017 2us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears    
Capital lease commitments for 2018 2us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears    
Capital lease commitments for 2019 2us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears    
Capital lease commitments beyond 2019 2us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter    
Discontinued operations      
Rental expense $ 95ibm_RentalExpense
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
$ 115ibm_RentalExpense
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
$ 110ibm_RentalExpense
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember