Description of Business and Basis of Presentation (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2013
Support services revenue
Restructuring Cost and Reserve [Line Items]
Prior period reclassification adjustment	$ 5	$ 10
Cost of software
Restructuring Cost and Reserve [Line Items]
Prior period reclassification adjustment	$ 4	$ 8

The amount of a reclassification adjustment made to prior period financial statement amounts.

No definition available.

Name:	us-gaap_PriorPeriodReclassificationAdjustment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration