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Segment Reporting - Segment Revenue and Segment Profit (Loss) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
service_offering
Sep. 30, 2015
USD ($)
Segment Reporting Information [Line Items]        
Primary reportable segments | service_offering     3  
Segment Revenue $ 1,596 $ 1,571 $ 4,894 $ 4,932
Segment Profit (Loss) 97 (293) 245 (160)
Commercial Industries Member]        
Segment Reporting Information [Line Items]        
Segment Revenue 664 720 2,030 2,161
Segment Profit (Loss) 21 14 44 51
Healthcare [Member]        
Segment Reporting Information [Line Items]        
Segment Revenue 397 422 1,277 1,293
Segment Profit (Loss) 38 32 112 113
Public Sector [Member]        
Segment Reporting Information [Line Items]        
Segment Revenue 443 429 1,290 1,283
Segment Profit (Loss) 59 51 163 145
Other Segments [Member]        
Segment Reporting Information [Line Items]        
Segment Revenue 92 0 297 195
Segment Profit (Loss) $ (21) (390) $ (74) $ (469)
Charge associated with healthcare implementation   389    
Decrease to revenue from charge associated with healthcare implementation   116    
Increase to cost of services from charge associated with healthcare implementation   $ 273