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Revenue by Product and Services (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Segment Reporting Information                      
Products (software and hardware)                 $ 1,297 [1] $ 1,122 [1] $ 933 [1]
Consulting services                 776 695 536
Maintenance services                 592 545 467
Total services                 1,368 1,240 1,003
Total revenue $ 740 $ 647 $ 665 $ 613 $ 673 $ 602 $ 581 $ 506 $ 2,665 $ 2,362 $ 1,936
[1] Our data warehousing software and hardware products are often sold and delivered together in the form of a "node" of capacity as an integrated technology solution. Accordingly, it is impracticable to provide the breakdown of revenue from various types of software and hardware products.