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v3.25.2

Commitments - Extensions of Credit (Details) - USD ($) $ in Billions | Jun. 30, 2025 | Dec. 31, 2024
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Extended lines of credit |  |
Other Commitments [Line Items] |  |
Unused amounts in lines of credit to third-party entities and commitments for future financing to clients | $ 2.0 | $ 1.6
Financing for client purchase agreements |  |
Other Commitments [Line Items] |  |
Unused amounts in lines of credit to third-party entities and commitments for future financing to clients | $ 2.1 | $ 2.2

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_OtherCommitmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Unused amount of commitments to extend credit to customers. + References No definition available. + Details
Name: | us-gaap_UnusedCommitmentsToExtendCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_OtherCommitmentsAxis=ibm_ExtendedLinesOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_OtherCommitmentsAxis=ibm_FinancingForClientPurchaseAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |