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Other (Income) and Expense (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Other (Income) and Expense.    
Foreign currency transaction losses/(gains) $ 88 $ (176)
(Gains)/losses on derivative instruments (142) 102
Interest income (170) (17)
Net (gains)/losses from securities and investment assets 5 218
Retirement-related costs/(income) (5) 202
Other (22) (83)
Total other (income) and expense $ (245) 246
Unrealized loss on Kyndryl retained shares   $ 222