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Business Segments (Corporate Items) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Segment Reporting Information [Line Items]    
Amortization expense of acquired intangible assets $ 23 $ 17
Restructuring charges 0 9
Merger and strategic initiatives 6 9
Total (248) (219)
Corporate Items    
Segment Reporting Information [Line Items]    
Amortization expense of acquired intangible assets 23 17
Restructuring charges 0 9
Merger and strategic initiatives 6 9
Total $ 29 $ 35