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Goodwill and Purchased Intangible Assets - Schedule of Goodwill (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Goodwill [Roll Forward]    
Goodwill $ 2,760 $ 2,756
Accumulated Impairment Losses (23) (23)
Total 2,733  
Additions 9  
Impairment 0  
Other (5)  
Total 2,737  
Software Segment [Domain]    
Goodwill [Roll Forward]    
Goodwill 1,940 1,936
Accumulated Impairment Losses (7) (7)
Total 1,929  
Additions 9  
Impairment 0  
Other (5)  
Total 1,933  
Services Segment [Domain]    
Goodwill [Roll Forward]    
Goodwill 658 658
Accumulated Impairment Losses 0 0
Total 658  
Additions 0  
Impairment 0  
Other 0  
Total 658  
Hardware Segment [Domain]    
Goodwill [Roll Forward]    
Goodwill 162 162
Accumulated Impairment Losses (16) $ (16)
Total 146  
Additions 0  
Impairment 0  
Other 0  
Total $ 146