Other (Income) and Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Other Income and Expenses [Abstract]
(Gains)/losses on foreign currency transactions	$ (84)	$ 470	$ 1,131	$ 126
(Gains)/losses on derivative instruments	162	(428)	(881)	(1)
Interest income	(150)	(170)	(513)	(597)
Net (gains)/losses from securities and investment assets	(3)	(4)	8	(14)
Retirement-related costs/(income)	13	2,797	61	2,991
Other	(110)	(422)	(181)	(810)
Total other (income) and expense	$ (173)	2,244	(376)	1,694
Pension settlement charge		2,700	$ 0	2,725
Disposal Group, Disposed of by Sale, Not Discontinued Operations | QRadar SaaS
Divestitures
Pre-tax gain on sale of business		$ 351		351
Disposal Group, Disposed of by Sale, Not Discontinued Operations | The Weather Company
Divestitures
Pre-tax gain on sale of business				$ 241