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Segments - Pre-Tax Income Reconciliation (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Pre-tax income from continuing operations    
Amortization of acquired intangible assets $ (473) $ (173)
Acquisition-related (charges)/income 0 (39)
Non-operating retirement-related (costs)/income (264) (138)
Other - divested businesses 25 (56)
Income/(loss) from continuing operations before income taxes (49) 1,883
Business Segments    
Pre-tax income from continuing operations    
Income/(loss) from continuing operations before income taxes 1,003 2,445
Internal transactions    
Pre-tax income from continuing operations    
Income/(loss) from continuing operations before income taxes (55) (89)
Unallocated corporate amounts    
Pre-tax income from continuing operations    
Income/(loss) from continuing operations before income taxes $ (284) $ (67)