Other (Income) and Expenses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivative Instruments, Gain (Loss)
Foreign currency transaction losses/(gains)	$ (260)	$ (352)	$ (338)	$ (1,021)
(Gains)/losses on derivative instruments	316	189	315	730
Interest income	(156)	(53)	(527)	(98)
Net (gains)/losses from securities and investment assets	(5)	(11)	3	262
Retirement-related costs/(income)	(12)	6,062	(16)	6,455
Other	(97)	(80)	(158)	(407)
Total other (income) and expense	$ (215)	5,755	(721)	5,921
Pension settlement charge		5,900	$ 0	5,894	[1]
Gain (loss) on divestiture of assets				259
Kyndryl Holdings, Inc
Derivative Instruments, Gain (Loss)
Equity securities, gain (loss)		11		(267)
Cash-Settled Swap
Derivative Instruments, Gain (Loss)
(Gains)/losses on derivative instruments		$ (3)		$ 85

[1] ncludes immaterial cash flows from discontinued operations.