Basis of Presentation (Details) $ in Millions |
3 Months Ended | ||||||
|---|---|---|---|---|---|---|---|
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Mar. 31, 2022
USD ($)
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Mar. 31, 2021
USD ($)
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Dec. 31, 2021
USD ($)
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Nov. 03, 2021 |
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| Provision for/(benefit from) income taxes | $ (39.0) | $ (160.0) | [1] | ||||
| Effective tax rate (as a percent) | (6.30%) | (65.50%) | |||||
| Common Stocks, Including Additional Paid in Capital | $ 57,603.0 | $ 57,319.0 | |||||
| Retained earnings | 153,401.0 | $ 154,209.0 | |||||
| Other (income) and expense | |||||||
| Noncontrolling interest amounts, net of tax | 4.9 | $ 4.9 | |||||
| Kyndryl Holdings, Inc | |||||||
| Total of Kyndryl stock distributed to IBM stockholders of record as of 10/25/2021 (as a percentage) | 80.10% | ||||||
| Ownership interest by stockholders (in percent) | 19.90% | ||||||
| Revision of Prior Period, Reclassification, Adjustment | |||||||
| Common Stocks, Including Additional Paid in Capital | 63.0 | ||||||
| Retained earnings | $ (63.0) | ||||||
| Kyndryl Holdings, Inc | |||||||
| Total of Kyndryl stock distributed to IBM stockholders of record as of 10/25/2021 (as a percentage) | 80.10% | ||||||
| Share conversion ratio | 0.2 | ||||||
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- Definition Ratio applied to the conversion of stock. No definition available.
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| X | ||||||||||
- Definition Represents the percentage of Kyndryl publicly traded common stock distributed to IBM stockholders of record as of 10/25/2021 No definition available.
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- Definition Amount of par value plus amounts in excess of par value or issuance value for common stock issued. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity. No definition available.
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- Definition Amount of Net Income (Loss) attributable to noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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