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Segment Reporting, Segment Revenue and Segment Profit (Loss) (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
service_offering
primaryreportablesegment
Jun. 30, 2014
USD ($)
Segment Reporting Information [Line Items]        
Primary Reportable Segments, Number | primaryreportablesegment     2  
Segment Revenue $ 4,590 $ 4,941 $ 9,059 $ 9,712
Segment Profit (Loss) 344 457 674 878
Services [Member]        
Segment Reporting Information [Line Items]        
Segment Revenue 2,569 2,651 5,083 5,236
Segment Profit (Loss) 192 226 $ 381 448
Services [Member] | Outsourcing Offerings [Member]        
Segment Reporting Information [Line Items]        
Outsourcing Service Offerings, Number | service_offering     2  
Document Technology [Member]        
Segment Reporting Information [Line Items]        
Segment Revenue 1,880 2,126 $ 3,710 4,170
Segment Profit (Loss) 228 306 431 555
Other [Member]        
Segment Reporting Information [Line Items]        
Segment Revenue 141 164 266 306
Segment Profit (Loss) $ (76) $ (75) $ (138) $ (125)