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Segments - Pre-Tax Income Reconciliation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pre-tax income from continuing operations      
Amortization of acquired intangible assets $ (1,830) $ (1,627) $ (1,747)
Acquisition-related (charges)/income (122) (33) (18)
Non-operating retirement-related (costs)/income (3,457) 39 (6,548)
Kyndryl-related impacts 0 0 (351)
Stock-based compensation (1,311) (1,133) (987)
Net interest excluding the Financing segment (984) (973) (1,071)
Workforce rebalancing charges (692) (435) 0
Other-divested businesses 234 83 239
Pre-tax income from continuing operations 5,797 8,690 1,156
Pension settlement charges 3,113 0 5,894
Operating Segments      
Pre-tax income from continuing operations      
Workforce rebalancing charges     (40)
Pre-tax income from continuing operations 13,535 12,829 11,893
Unallocated corporate amounts and other      
Pre-tax income from continuing operations      
Pre-tax income from continuing operations $ 425 $ (59) $ (254)