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Segment and Other Supplemental Information - Revenue by Product and Services (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Segment Reporting [Abstract]        
Products (software and hardware) $ 256 $ 300 $ 497 $ 573
Consulting services 194 203 366 392
Maintenance services 173 173 342 339
Total services 367 376 708 731
Total revenue $ 623 $ 676 $ 1,205 $ 1,304