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Segments - Pre-Tax Income Reconciliation (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pre-tax income from continuing operations        
Amortization of acquired intangible assets   $ (1,838) $ (1,832) $ (1,271)
Acquisition-related (charges)/income   (43) (13) (423)
Non-operating retirement-related (costs)/income   (1,282) (1,073) (576)
Separation-related charges   118    
Other - divested businesses   25 12 580
Income from continuing operations before income taxes   4,837 2,572 7,206
Charge for structural actions $ 1,472      
Business Segments        
Pre-tax income from continuing operations        
Income from continuing operations before income taxes   8,637 6,479 9,502
Internal transactions        
Pre-tax income from continuing operations        
Income from continuing operations before income taxes   (7) (28) (21)
Unallocated corporate amounts        
Pre-tax income from continuing operations        
Income from continuing operations before income taxes   $ (774) $ (973) $ (586)