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Acquisitions & Divestitures - Divestitures (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Nov. 02, 2022	Nov. 03, 2021
Divestitures
Income/(loss) from discontinued operations, net of tax	$ (7)	$ 71
Kyndryl Holdings, Inc
Divestitures
Kyndryl stock distributed to IBM stockholders				80.10%
Ownership interest by stockholders (in percent)			0.00%	19.90%

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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