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Segments - Pre-Tax Income Reconciliation (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Pre-tax income from continuing operations        
Amortization of acquired intangible assets   $ (1,858) $ (1,298) $ (809)
Acquisition-related charges   (13) (423) (16)
Non-operating retirement-related (costs)/income   (1,123) (615) (1,572)
Spin-off related charges   (28)    
Other - divested businesses   (9) 574 287
Income from continuing operations before income taxes   4,637 10,166 11,342
Charge for structural actions $ 2,036      
Business Segments        
Pre-tax income from continuing operations        
Income from continuing operations before income taxes   9,040 12,835 14,562
Internal transactions        
Pre-tax income from continuing operations        
Income from continuing operations before income taxes   (381) (290) (725)
Unallocated corporate amounts        
Pre-tax income from continuing operations        
Income from continuing operations before income taxes   $ (990) $ (617) $ (385)