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Segments - Pre-Tax Income Reconciliation (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Pre-tax income from continuing operations        
Amortization of acquired intangible assets   $ (1,627) $ (1,747) $ (1,838)
Acquisition-related charges   (33) (18) (43)
Non-operating retirement-related (costs)/income   39 (6,548) (1,282)
Kyndryl-related impacts   0 (351) 118
Workforce rebalancing charges   (435) 0 0
Other-divested businesses   5 91 (102)
Pre-tax income from continuing operations   8,690 1,156 4,837
Pre-tax pension settlement charge $ 5,900 0 5,894 0
Operating Segments        
Pre-tax income from continuing operations        
Workforce rebalancing charges     (40) (182)
Pre-tax income from continuing operations   11,283 10,441 8,765
Unallocated corporate amounts and other        
Pre-tax income from continuing operations        
Pre-tax income from continuing operations   $ (541) $ (712) $ (782)