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Segments - Pre-Tax Income Reconciliation (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Pre-tax income from continuing operations    
Amortization of acquired intangible assets $ (461) $ (447)
Acquisition-related (charges)/income (7) (16)
Non-operating retirement-related (costs)/income (202) (332)
Kyndryl-related impacts (222)  
Other - divested businesses (52) (15)
Income from continuing operations before income taxes 623 244 [1]
Business Segments    
Pre-tax income from continuing operations    
Income from continuing operations before income taxes 1,766 1,325
Internal transactions    
Pre-tax income from continuing operations    
Income from continuing operations before income taxes (11) (9)
Unallocated corporate amounts    
Pre-tax income from continuing operations    
Income from continuing operations before income taxes $ (188) $ (262)
[1] Reclassified to reflect discontinued operations presentation.