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Borrowings (Pre Swap Borrowing Table) (Details2) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Debt Disclosure    
Aggregate carrying amount of long-term borrowings before adjusting for unamortized discount and fair value adjustment $ 39,737us-gaap_DebtInstrumentCarryingAmount $ 37,036us-gaap_DebtInstrumentCarryingAmount
Less: Net unamortized discount 853us-gaap_DebtInstrumentUnamortizedDiscount 872us-gaap_DebtInstrumentUnamortizedDiscount
Add: Fair value adjustment 792us-gaap_DeferredGainLossOnDiscontinuationOfInterestRateFairValueHedge [1] 546us-gaap_DeferredGainLossOnDiscontinuationOfInterestRateFairValueHedge [1]
Long-Term Debt, including current portion 39,675us-gaap_LongTermDebt 36,710us-gaap_LongTermDebt
Less: current maturities 4,601us-gaap_LongTermDebtCurrent 3,854us-gaap_LongTermDebtCurrent
Total long-term debt (excluding current portion) 35,073us-gaap_LongTermDebtNoncurrent 32,856us-gaap_LongTermDebtNoncurrent
U.S. dollar notes and debentures    
Debt Disclosure    
Aggregate carrying amount of long-term borrowings before adjusting for unamortized discount and fair value adjustment 31,404us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesMember		 27,887us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesMember
0.97% Notes and Debentures, maturing in 2015-2016    
Debt Disclosure    
Aggregate carrying amount of long-term borrowings before adjusting for unamortized discount and fair value adjustment 9,254us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesZeroPointNinetySevenPercentMaturing2015Through2016Member		 6,456us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesZeroPointNinetySevenPercentMaturing2015Through2016Member		 [2]
Debt instrument, stated interest rate percentage (as a percent) 0.97%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesZeroPointNinetySevenPercentMaturing2015Through2016Member		  
Debt instrument, maturity year range, start 2015  
Debt instrument, maturity year range, end 2016  
0.97% Notes and Debentures, maturing in 2015-2016 | IBM International Group Capital LLC    
Debt Disclosure    
Aggregate carrying amount of long-term borrowings before adjusting for unamortized discount and fair value adjustment   17us-gaap_DebtInstrumentCarryingAmount
/ ibm_BusinessNameAxis
= ibm_IbmInternationalGroupCapitalLlcMember
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesZeroPointNinetySevenPercentMaturing2015Through2016Member
Percentage of ownership in indirect subsidiary (percent, expressed as a decimal) 100.00%ibm_IndirectSubsidiaryOwnershipPercentage
/ ibm_BusinessNameAxis
= ibm_IbmInternationalGroupCapitalLlcMember
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesZeroPointNinetySevenPercentMaturing2015Through2016Member		  
4.73% Notes and Debentures, maturing in 2017-2018    
Debt Disclosure    
Aggregate carrying amount of long-term borrowings before adjusting for unamortized discount and fair value adjustment 6,835us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesFourPointSeventyThreePercentMaturing2017Through2018Member		 8,465us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesFourPointSeventyThreePercentMaturing2017Through2018Member
Debt instrument, stated interest rate percentage (as a percent) 4.73%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesFourPointSeventyThreePercentMaturing2017Through2018Member		  
Debt instrument, maturity year range, start 2017  
Debt instrument, maturity year range, end 2018  
2.19% Notes and Debentures, maturing in 2019-2021    
Debt Disclosure    
Aggregate carrying amount of long-term borrowings before adjusting for unamortized discount and fair value adjustment 6,555us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesTwoPointNineteenPercentMaturing2019Through2021Member		 6,206us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesTwoPointNineteenPercentMaturing2019Through2021Member
Debt instrument, stated interest rate percentage (as a percent) 2.19%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesTwoPointNineteenPercentMaturing2019Through2021Member		  
Debt instrument, maturity year range, start 2019  
Debt instrument, maturity year range, end 2021  
1.88% Notes and debentures, maturing in 2022    
Debt Disclosure    
Aggregate carrying amount of long-term borrowings before adjusting for unamortized discount and fair value adjustment 1,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesOnePointEightyEightPercentMaturing2022Member		 1,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesOnePointEightyEightPercentMaturing2022Member
Debt instrument, stated interest rate percentage (as a percent) 1.88%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesOnePointEightyEightPercentMaturing2022Member		  
Debt instrument, maturity year 2022  
3.38% Notes and debentures, maturing in 2023    
Debt Disclosure    
Aggregate carrying amount of long-term borrowings before adjusting for unamortized discount and fair value adjustment 1,500us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesThreePointThirtyEightPercentMaturing2023Member		 1,500us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesThreePointThirtyEightPercentMaturing2023Member
Debt instrument, stated interest rate percentage (as a percent) 3.38%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesThreePointThirtyEightPercentMaturing2023Member		  
Debt instrument, maturity year 2023  
3.63% Notes and debentures, maturing in 2024    
Debt Disclosure    
Aggregate carrying amount of long-term borrowings before adjusting for unamortized discount and fair value adjustment 2,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesThreePointSixtyThreePercentMaturing2024Member		  
Debt instrument, stated interest rate percentage (as a percent) 3.63%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesThreePointSixtyThreePercentMaturing2024Member		  
Debt instrument, maturity year 2024  
7.00% Notes and Debentures, maturing in 2025    
Debt Disclosure    
Aggregate carrying amount of long-term borrowings before adjusting for unamortized discount and fair value adjustment 600us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesSevenPointZeroPercentMaturing2025Member		 600us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesSevenPointZeroPercentMaturing2025Member
Debt instrument, stated interest rate percentage (as a percent) 7.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesSevenPointZeroPercentMaturing2025Member		  
Debt instrument, maturity year 2025  
6.22% Notes and Debentures, maturing in 2027    
Debt Disclosure    
Aggregate carrying amount of long-term borrowings before adjusting for unamortized discount and fair value adjustment 469us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesSixPointTwentyTwoPercentMaturing2027Member		 469us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesSixPointTwentyTwoPercentMaturing2027Member
Debt instrument, stated interest rate percentage (as a percent) 6.22%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesSixPointTwentyTwoPercentMaturing2027Member		  
Debt instrument, maturity year 2027  
6.50% Notes and Debentures, maturing in 2028    
Debt Disclosure    
Aggregate carrying amount of long-term borrowings before adjusting for unamortized discount and fair value adjustment 313us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesSixPointFivePercentMaturing2028Member		 313us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesSixPointFivePercentMaturing2028Member
Debt instrument, stated interest rate percentage (as a percent) 6.50%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesSixPointFivePercentMaturing2028Member		  
Debt instrument, maturity year 2028  
5.88% Notes and Debentures, maturing in 2032    
Debt Disclosure    
Aggregate carrying amount of long-term borrowings before adjusting for unamortized discount and fair value adjustment 600us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesFivePointEightyEightPercentMaturing2032Member		 600us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesFivePointEightyEightPercentMaturing2032Member
Debt instrument, stated interest rate percentage (as a percent) 5.88%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesFivePointEightyEightPercentMaturing2032Member		  
Debt instrument, maturity year 2032  
8.00% Notes and Debentures, maturing in 2038    
Debt Disclosure    
Aggregate carrying amount of long-term borrowings before adjusting for unamortized discount and fair value adjustment 83us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesEightPointZeroPercentMaturing2038Member		 83us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesEightPointZeroPercentMaturing2038Member
Debt instrument, stated interest rate percentage (as a percent) 8.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesEightPointZeroPercentMaturing2038Member		  
Debt instrument, maturity year 2038  
5.60% Notes and Debentures, maturing in 2039    
Debt Disclosure    
Aggregate carrying amount of long-term borrowings before adjusting for unamortized discount and fair value adjustment 745us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesFivePointSixPercentMaturing2039Member		 745us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesFivePointSixPercentMaturing2039Member
Debt instrument, stated interest rate percentage (as a percent) 5.60%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesFivePointSixPercentMaturing2039Member		  
Debt instrument, maturity year 2039  
4.00% Notes and Debentures, maturing in 2042    
Debt Disclosure    
Aggregate carrying amount of long-term borrowings before adjusting for unamortized discount and fair value adjustment 1,107us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesFourPointZeroPercentMaturing2042Member		 1,107us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesFourPointZeroPercentMaturing2042Member
Debt instrument, stated interest rate percentage (as a percent) 4.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesFourPointZeroPercentMaturing2042Member		  
Debt instrument, maturity year 2042  
7.00% Notes and Debentures, maturing in 2045    
Debt Disclosure    
Aggregate carrying amount of long-term borrowings before adjusting for unamortized discount and fair value adjustment 27us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesSevenPointZeroPercentMaturing2045Member		 27us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesSevenPointZeroPercentMaturing2045Member
Debt instrument, stated interest rate percentage (as a percent) 7.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesSevenPointZeroPercentMaturing2045Member		  
Debt instrument, maturity year 2045  
7.13% Notes and Debentures, maturing in 2096    
Debt Disclosure    
Aggregate carrying amount of long-term borrowings before adjusting for unamortized discount and fair value adjustment 316us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesSevenPointThirteenPercentMaturing2096Member		 316us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesSevenPointThirteenPercentMaturing2096Member
Debt instrument, stated interest rate percentage (as a percent) 7.13%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= ibm_NotesAndDebenturesSevenPointThirteenPercentMaturing2096Member		  
Debt instrument, maturity year 2096  
1.85% Euros maturing in 2015 - 2025    
Debt Disclosure    
Aggregate carrying amount of long-term borrowings before adjusting for unamortized discount and fair value adjustment 5,463us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_EurosOnePointEightyFivePercentMaturing2015Through2025Member		 5,894us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_EurosOnePointEightyFivePercentMaturing2015Through2025Member
Debt instrument, stated interest rate percentage (as a percent) 1.85%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= ibm_EurosOnePointEightyFivePercentMaturing2015Through2025Member		  
Debt instrument, maturity year range, start 2015  
Debt instrument, maturity year range, end 2025  
2.75% Pound sterling maturing in 2017 - 2020    
Debt Disclosure    
Aggregate carrying amount of long-term borrowings before adjusting for unamortized discount and fair value adjustment 1,176us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_PoundTwoPointSeventyFivePercentMaturing2017Through2020Member		 1,254us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_PoundTwoPointSeventyFivePercentMaturing2017Through2020Member
Debt instrument, stated interest rate percentage (as a percent) 2.75%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= ibm_PoundTwoPointSeventyFivePercentMaturing2017Through2020Member		  
Debt instrument, maturity year range, start 2017  
Debt instrument, maturity year range, end 2020  
0.5% Japanese yen maturing in 2017-2019    
Debt Disclosure    
Aggregate carrying amount of long-term borrowings before adjusting for unamortized discount and fair value adjustment 733us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_JapaneseYenZeroPointFivePercentMaturing2017Through2019Member		 1,057us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_JapaneseYenZeroPointFivePercentMaturing2017Through2019Member
Debt instrument, stated interest rate percentage (as a percent) 0.50%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= ibm_JapaneseYenZeroPointFivePercentMaturing2017Through2019Member		  
Debt instrument, maturity year range, start 2017  
Debt instrument, maturity year range, end 2019  
3.8% Swiss francs maturing in 2015-2020    
Debt Disclosure    
Aggregate carrying amount of long-term borrowings before adjusting for unamortized discount and fair value adjustment 162us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_SwissFrancsThreePointEightPercentMaturing2015Through2020Member		 181us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_SwissFrancsThreePointEightPercentMaturing2015Through2020Member
Debt instrument, stated interest rate percentage (as a percent) 3.80%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= ibm_SwissFrancsThreePointEightPercentMaturing2015Through2020Member		  
Debt instrument, maturity year range, start 2015  
Debt instrument, maturity year range, end 2020  
2.2% Canadian Maturing 2017    
Debt Disclosure    
Aggregate carrying amount of long-term borrowings before adjusting for unamortized discount and fair value adjustment 432us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_CanadianTwoPointTwoPercentMaturing2017Member		 471us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_CanadianTwoPointTwoPercentMaturing2017Member
Debt instrument, stated interest rate percentage (as a percent) 2.20%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= ibm_CanadianTwoPointTwoPercentMaturing2017Member		  
Debt instrument, maturity year 2017  
10.1% Other maturing in 2015-2017    
Debt Disclosure    
Aggregate carrying amount of long-term borrowings before adjusting for unamortized discount and fair value adjustment $ 367us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_OtherCurrenciesMaturing2015Through2017Member		 $ 291us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ibm_OtherCurrenciesMaturing2015Through2017Member
Debt instrument, stated interest rate percentage (as a percent) 10.10%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= ibm_OtherCurrenciesMaturing2015Through2017Member		  
Debt instrument, maturity year range, start 2015  
Debt instrument, maturity year range, end 2017  
[1]

The portion of the company’s fixed-rate debt obligations that is hedged is reflected in the ConsolidatedStatement of Financial Position as an amount equal to the sum of the debt’s carrying value plus a fair value adjustment representing changes in the fair value of the hedged debt obligations attributable to movements in benchmark interest rates.
[2]

Includes $17 million of debt securities issued by IBM International Group Capital, LLC, an indirect 100-percent owned finance subsidiary of the company, which matured in the first half of 2014. Debt securities issued by IBM International Group Capital, LLC are fully and unconditionally guaranteed by the company.