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Segment and Other Supplemental Information - Revenue by Product and Services (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Segment Reporting [Abstract]        
Products (software and hardware) $ 208 $ 240 $ 630 $ 737
Consulting services 169 194 540 560
Maintenance services 175 172 526 514
Total services 344 366 1,066 1,074
Total revenue $ 552 $ 606 $ 1,696 $ 1,811