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Acquisitions & Divestitures - Divestitures (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($) divestiture	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Nov. 02, 2022	Nov. 03, 2021
Divestitures
Income/(loss) from discontinued operations, net of tax \| $	$ 2	$ (73)	$ (4)	$ (2)
Number of divestitures \| divestiture	2
Kyndryl Holdings, Inc
Divestitures
Ownership interest by stockholders (in percent)						19.90%
Kyndryl Holdings, Inc \| Kyndryl Holdings, Inc
Divestitures
Kyndryl stock distributed to IBM stockholders						80.10%
Ownership interest by stockholders (in percent)					0.00%

Amount after tax of income (loss) from a discontinued operation attributable to the parent. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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