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      contextRef="From2026-08-102026-08-10_us-gaap_CommonStockMember_exch_XCHI"
      id="Fact000032">IBM</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="From2026-08-102026-08-10_us-gaap_CommonStockMember_exch_XCHI"
      id="Fact000033">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="From2026-08-102026-08-10_custom_Notes0.300PercentDue2026Member_exch_XNYS"
      id="Fact000034">0.300% Notes due 2026</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="From2026-08-102026-08-10_custom_Notes0.300PercentDue2026Member_exch_XNYS"
      id="Fact000035">IBM 26B</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="From2026-08-102026-08-10_custom_Notes0.300PercentDue2026Member_exch_XNYS"
      id="Fact000036">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="From2026-08-102026-08-10_custom_Notes1.250PercentDue2027Member_exch_XNYS"
      id="Fact000038">1.250% Notes due 2027</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="From2026-08-102026-08-10_custom_Notes1.250PercentDue2027Member_exch_XNYS"
      id="Fact000039">IBM 27B</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="From2026-08-102026-08-10_custom_Notes1.250PercentDue2027Member_exch_XNYS"
      id="Fact000040">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="From2026-08-102026-08-10_custom_Notes3.375PercentDue2027Member_exch_XNYS"
      id="Fact000042">3.375% Notes due 2027</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="From2026-08-102026-08-10_custom_Notes3.375PercentDue2027Member_exch_XNYS"
      id="Fact000043">IBM 27F</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="From2026-08-102026-08-10_custom_Notes3.375PercentDue2027Member_exch_XNYS"
      id="Fact000044">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="From2026-08-102026-08-10_custom_Notes0.300PercentDue2028Member_exch_XNYS"
      id="Fact000045">0.300% Notes due 2028</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="From2026-08-102026-08-10_custom_Notes0.300PercentDue2028Member_exch_XNYS"
      id="Fact000046">IBM 28B</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="From2026-08-102026-08-10_custom_Notes0.300PercentDue2028Member_exch_XNYS"
      id="Fact000047">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="From2026-08-102026-08-10_custom_Notes1.750PercentDue2028Member_exch_XNYS"
      id="Fact000048">1.750% Notes due 2028</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="From2026-08-102026-08-10_custom_Notes1.750PercentDue2028Member_exch_XNYS"
      id="Fact000049">IBM 28A</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="From2026-08-102026-08-10_custom_Notes1.750PercentDue2028Member_exch_XNYS"
      id="Fact000050">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="From2026-08-102026-08-10_custom_Notes1.500PercentDue2029Member_exch_XNYS"
      id="Fact000052">1.500% Notes due 2029</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="From2026-08-102026-08-10_custom_Notes1.500PercentDue2029Member_exch_XNYS"
      id="Fact000053">IBM 29</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="From2026-08-102026-08-10_custom_Notes1.500PercentDue2029Member_exch_XNYS"
      id="Fact000054">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="From2026-08-102026-08-10_custom_Notes0.875PercentDue2030Member_exch_XNYS"
      id="Fact000056">0.875% Notes due 2030</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="From2026-08-102026-08-10_custom_Notes0.875PercentDue2030Member_exch_XNYS"
      id="Fact000057">IBM 30A</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="From2026-08-102026-08-10_custom_Notes0.875PercentDue2030Member_exch_XNYS"
      id="Fact000058">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="From2026-08-102026-08-10_custom_Notes2.900PercentDue2030Member_exch_XNYS"
      id="Fact000059">2.900% Notes due 2030</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="From2026-08-102026-08-10_custom_Notes2.900PercentDue2030Member_exch_XNYS"
      id="Fact000060">IBM 30C</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="From2026-08-102026-08-10_custom_Notes2.900PercentDue2030Member_exch_XNYS"
      id="Fact000061">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="From2026-08-102026-08-10_custom_Notes1.750PercentDue2031Member_exch_XNYS"
      id="Fact000062">1.750% Notes due 2031</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="From2026-08-102026-08-10_custom_Notes1.750PercentDue2031Member_exch_XNYS"
      id="Fact000063">IBM 31</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="From2026-08-102026-08-10_custom_Notes1.750PercentDue2031Member_exch_XNYS"
      id="Fact000064">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="From2026-08-102026-08-10_custom_Notes3.000PercentDue2031Member_exch_XNYS"
      id="Fact000065">3.000% Notes due 2031</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="From2026-08-102026-08-10_custom_Notes3.000PercentDue2031Member_exch_XNYS"
      id="Fact000066">IBM 31A</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="From2026-08-102026-08-10_custom_Notes3.000PercentDue2031Member_exch_XNYS"
      id="Fact000067">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="From2026-08-102026-08-10_custom_Notes3.625PercentDue2031Member_exch_XNYS"
      id="Fact000068">3.625% Notes due 2031</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="From2026-08-102026-08-10_custom_Notes3.625PercentDue2031Member_exch_XNYS"
      id="Fact000069">IBM 31B</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="From2026-08-102026-08-10_custom_Notes3.625PercentDue2031Member_exch_XNYS"
      id="Fact000070">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="From2026-08-102026-08-10_exch_XNYS_custom_Notes0.650PercentDue2032Member"
      id="Fact000071">0.650% Notes due 2032</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="From2026-08-102026-08-10_exch_XNYS_custom_Notes0.650PercentDue2032Member"
      id="Fact000072">IBM 32A</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="From2026-08-102026-08-10_exch_XNYS_custom_Notes0.650PercentDue2032Member"
      id="Fact000073">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="From2026-08-102026-08-10_custom_Notes3.150PercentDue2033Member_exch_XNYS"
      id="Fact000074">3.150% Notes due 2033</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="From2026-08-102026-08-10_custom_Notes3.150PercentDue2033Member_exch_XNYS"
      id="Fact000075">IBM 33A</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="From2026-08-102026-08-10_custom_Notes3.150PercentDue2033Member_exch_XNYS"
      id="Fact000076">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="From2026-08-102026-08-10_custom_Notes3.450PercentDue2034Member_exch_XNYS"
      id="Fact000077">3.450% Notes due 2034</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="From2026-08-102026-08-10_custom_Notes3.450PercentDue2034Member_exch_XNYS"
      id="Fact000078">IBM 34A</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="From2026-08-102026-08-10_custom_Notes3.450PercentDue2034Member_exch_XNYS"
      id="Fact000079">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="From2026-08-102026-08-10_exch_XNYS_custom_Notes1.250PercentDue2034Member"
      id="Fact000080">1.250% Notes due 2034</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="From2026-08-102026-08-10_exch_XNYS_custom_Notes1.250PercentDue2034Member"
      id="Fact000081">IBM 34</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="From2026-08-102026-08-10_exch_XNYS_custom_Notes1.250PercentDue2034Member"
      id="Fact000082">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="From2026-08-102026-08-10_custom_Notes3.750PercentDue2035Member_exch_XNYS"
      id="Fact000083">3.750% Notes due 2035</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="From2026-08-102026-08-10_custom_Notes3.750PercentDue2035Member_exch_XNYS"
      id="Fact000084">IBM 35</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="From2026-08-102026-08-10_custom_Notes3.750PercentDue2035Member_exch_XNYS"
      id="Fact000085">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="From2026-08-102026-08-10_custom_Notes3.450PercentDue2037Member_exch_XNYS"
      id="Fact000086">3.450% Notes due 2037</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="From2026-08-102026-08-10_custom_Notes3.450PercentDue2037Member_exch_XNYS"
      id="Fact000087">IBM 37</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="From2026-08-102026-08-10_custom_Notes3.450PercentDue2037Member_exch_XNYS"
      id="Fact000088">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="From2026-08-102026-08-10_custom_Notes3.850PercentDue2038Member_exch_XNYS"
      id="Fact000089">3.850% Notes due 2038</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="From2026-08-102026-08-10_custom_Notes3.850PercentDue2038Member_exch_XNYS"
      id="Fact000090">IBM 38B</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="From2026-08-102026-08-10_custom_Notes3.850PercentDue2038Member_exch_XNYS"
      id="Fact000091">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="From2026-08-102026-08-10_custom_Notes4.875PercentDue2038Member_exch_XNYS"
      id="Fact000092">4.875% Notes due 2038</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="From2026-08-102026-08-10_custom_Notes4.875PercentDue2038Member_exch_XNYS"
      id="Fact000093">IBM 38</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="From2026-08-102026-08-10_custom_Notes4.875PercentDue2038Member_exch_XNYS"
      id="Fact000094">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="From2026-08-102026-08-10_exch_XNYS_custom_Notes1.200PercentDie2040Member"
      id="Fact000095">1.200% Notes due 2040</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="From2026-08-102026-08-10_exch_XNYS_custom_Notes1.200PercentDie2040Member"
      id="Fact000096">IBM 40</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="From2026-08-102026-08-10_exch_XNYS_custom_Notes1.200PercentDie2040Member"
      id="Fact000097">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="From2026-08-102026-08-10_custom_Notes4.000PercentDue2043Member_exch_XNYS"
      id="Fact000098">4.000% Notes due 2043</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="From2026-08-102026-08-10_custom_Notes4.000PercentDue2043Member_exch_XNYS"
      id="Fact000099">IBM 43</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="From2026-08-102026-08-10_custom_Notes4.000PercentDue2043Member_exch_XNYS"
      id="Fact000100">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="From2026-08-102026-08-10_custom_Notes3.800PercentDue2045Member_exch_XNYS"
      id="Fact000101">3.800% Notes due 2045</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="From2026-08-102026-08-10_custom_Notes3.800PercentDue2045Member_exch_XNYS"
      id="Fact000102">IBM 45A</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="From2026-08-102026-08-10_custom_Notes3.800PercentDue2045Member_exch_XNYS"
      id="Fact000103">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="From2026-08-102026-08-10_custom_FloatingRateNotesdue2028Member_exch_XNYS"
      id="Fact000104">Floating Rate Notes due 2028</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="From2026-08-102026-08-10_custom_FloatingRateNotesdue2028Member_exch_XNYS"
      id="Fact000105">IBM 28E</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="From2026-08-102026-08-10_custom_FloatingRateNotesdue2028Member_exch_XNYS"
      id="Fact000106">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="From2026-08-102026-08-10_custom_Debentures6.22PercentDue2027Member_exch_XNYS"
      id="Fact000107">6.22% Debentures due 2027</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="From2026-08-102026-08-10_custom_Debentures6.22PercentDue2027Member_exch_XNYS"
      id="Fact000108">IBM 27</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="From2026-08-102026-08-10_custom_Debentures6.22PercentDue2027Member_exch_XNYS"
      id="Fact000109">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="From2026-08-102026-08-10_custom_Debentures6.50PercentDue2028Member_exch_XNYS"
      id="Fact000111">6.50% Debentures due 2028</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="From2026-08-102026-08-10_custom_Debentures6.50PercentDue2028Member_exch_XNYS"
      id="Fact000112">IBM 28</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="From2026-08-102026-08-10_custom_Debentures6.50PercentDue2028Member_exch_XNYS"
      id="Fact000113">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="From2026-08-102026-08-10_custom_Debentures5.875PercentDue2032Member_exch_XNYS"
      id="Fact000115">5.875% Debentures due 2032</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="From2026-08-102026-08-10_custom_Debentures5.875PercentDue2032Member_exch_XNYS"
      id="Fact000116">IBM 32D</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="From2026-08-102026-08-10_custom_Debentures5.875PercentDue2032Member_exch_XNYS"
      id="Fact000117">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="From2026-08-102026-08-10_custom_Debentures7.00PercentDue2045Member_exch_XNYS"
      id="Fact000119">7.00% Debentures due 2045</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="From2026-08-102026-08-10_custom_Debentures7.00PercentDue2045Member_exch_XNYS"
      id="Fact000120">IBM 45</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="From2026-08-102026-08-10_custom_Debentures7.00PercentDue2045Member_exch_XNYS"
      id="Fact000121">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="From2026-08-102026-08-10_custom_Debentures7.125PercentDue2096Member_exch_XNYS"
      id="Fact000123">7.125% Debentures due 2096</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="From2026-08-102026-08-10_custom_Debentures7.125PercentDue2096Member_exch_XNYS"
      id="Fact000124">IBM 96</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="From2026-08-102026-08-10_custom_Debentures7.125PercentDue2096Member_exch_XNYS"
      id="Fact000125">NYSE</dei:SecurityExchangeName>
    <dei:EntityEmergingGrowthCompany contextRef="AsOf2026-08-10" id="Fact000127">false</dei:EntityEmergingGrowthCompany>
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