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v3.25.2

Basis of Presentation - Supplier Finance Programs (Details) - Commitment With Third Party Financial Institution | 6 Months Ended
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Jun. 30, 2025
Minimum |
Other Commitments [Line Items] |
Contractual obligation average payment term duration | 90 days
Maximum |
Other Commitments [Line Items] |
Contractual obligation average payment term duration | 120 days

X
- Definition Contractual Obligation Average Payment Term Duration + References No definition available. + Details
Name: | ibm_ContractualObligationAveragePaymentTermDuration
Namespace Prefix: | ibm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- 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

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

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |