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Financing Receivables - Transfer of Financing Assets (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jan. 01, 2025
Financing receivables |  |  |
Financing receivable transferred, net gain (loss) | $ (25) | $ (33) |
Commercial Financing Receivables |  |  |
Financing receivables |  |  |
Financing receivables transferred | 3,715 | 3,686 |
Financing receivables transferred and uncollected | $ 686 | $ 786 |
Commercial Financing Receivables | Third Party Investor |  |  |
Financing receivables |  |  |
Transfer of financial assets, sales period |  |  | 26 months
Commercial Financing Receivables | Third Party Investor | Maximum |  |  |
Financing receivables |  |  |
Financing receivables to be sold |  |  | $ 1,300

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- Definition Amount of financing receivable transferred and uncollected. + References No definition available. + Details
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Namespace Prefix: | ibm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Financing Receivable, Transferred, Net Gain (Loss) + References No definition available. + Details
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Namespace Prefix: | ibm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Represents the amount of financing receivables to be sold in an agreement. The financing receivables may be sold at any one time, on a revolving basis. + References No definition available. + Details
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Namespace Prefix: | ibm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Transfers And Servicing Of Financial Assets, Sales Agreement Period + References No definition available. + Details
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Namespace Prefix: | ibm_
Data Type: | xbrli:durationItemType
Balance Type: | na
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- Definition Amount of decrease in financing receivable from sale and reclassification to held-for-sale. Excludes net investment in lease. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-11B Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-11 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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
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- Details
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- Details
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Balance Type: |
Period Type: |

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- Details
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