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Reorganization of Businesses (Net Charges Incurred By Business Segment) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]      
Reorganization of business charges $ 117 $ 73 $ 86
Products      
Restructuring Cost and Reserve [Line Items]      
Reorganization of business charges 84 48 57
Services      
Restructuring Cost and Reserve [Line Items]      
Reorganization of business charges $ 33 $ 25 $ 29