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Segment Information - Pre-Tax Income Reconciliation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Pre-tax income from continuing operations      
Amortization of acquired intangible assets $ (809) $ (945) $ (998)
Acquisition-related charges (16) (52) (5)
Non-operating retirement-related (costs)/income (1,572) (1,341) (448)
Income from continuing operations before income taxes 11,342 11,400 12,330
Business Segments      
Pre-tax income from continuing operations      
Income from continuing operations before income taxes 14,881 14,849 15,230
Internal transactions      
Pre-tax income from continuing operations      
Income from continuing operations before income taxes (758) (726) (1,160)
Unallocated corporate amounts      
Pre-tax income from continuing operations      
Income from continuing operations before income taxes $ (385) $ (385) $ (290)