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Segments - Pre-Tax Income Reconciliation (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Pre-tax income from continuing operations          
Amortization of acquired intangible assets     $ (1,747) $ (1,838) $ (1,832)
Acquisition-related charges     (18) (43) (13)
Non-operating retirement-related (costs)/income     (6,548) (1,282) (1,073)
Kyndryl-related impacts     (351) 118  
Other - divested businesses     91 (102) (70)
Income from continuing operations before income taxes     1,156 4,837 2,572
Charge for structural actions   $ 1,472      
Pre-tax pension settlement charge $ 5,900   5,894    
Business Segments          
Pre-tax income from continuing operations          
Income from continuing operations before income taxes     10,441 8,765 6,561
Internal transactions          
Pre-tax income from continuing operations          
Income from continuing operations before income taxes     (10) (7) (28)
Unallocated corporate amounts          
Pre-tax income from continuing operations          
Income from continuing operations before income taxes     $ (702) $ (774) $ (973)