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Segments - Pre-Tax Income Reconciliation (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Pre-tax income from continuing operations    
Amortization of acquired intangible assets $ (452) $ (473)
Acquisition-related (charges)/income (16) 0
Non-operating retirement-related (costs)/income (343) (264)
Spin-off related charges (61)  
Other - divested businesses (8) 25
Income/(loss) from continuing operations before income taxes 905 (49)
Business Segments    
Pre-tax income from continuing operations    
Income/(loss) from continuing operations before income taxes 2,122 1,003
Internal transactions    
Pre-tax income from continuing operations    
Income/(loss) from continuing operations before income taxes (73) (55)
Unallocated corporate amounts    
Pre-tax income from continuing operations    
Income/(loss) from continuing operations before income taxes $ (263) $ (284)