Segment and Geographic Information 4 (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended													3 Months Ended	12 Months Ended
	Mar. 31, 2013 Country Customer	Mar. 31, 2012 Customer	Mar. 31, 2011 Customer	Mar. 31, 2013 North America [Member] Country	Mar. 31, 2013 Europe [Member] Country	Mar. 31, 2013 Asia/Pacific [Member] Country	Mar. 31, 2013 South America [Member] Country	Mar. 31, 2013 Africa [Member] Country	Mar. 31, 2012 Purchased Software Products [Member]	Mar. 31, 2011 Purchased Software Products [Member]	Mar. 31, 2013 Mainframe Solutions [Member]	Mar. 31, 2012 Mainframe Solutions [Member] Fiscal 2012 Plan [Member]	Mar. 31, 2013 Enterprise Solutions [Member]	Mar. 31, 2013 Enterprise Solutions [Member] Purchased Software Products [Member]	Mar. 31, 2012 Enterprise Solutions [Member] Fiscal 2012 Plan [Member]	Mar. 31, 2013 Services [Member]	Mar. 31, 2012 Services [Member] Fiscal 2012 Plan [Member]
Segment Reporting [Line Items]
Intellectual property assets transaction value													$ 35
Severance costs											3	22	10		19	2	1
Impairment	$ 55								$ 0	$ 0				$ 55
Branches and wholly-owned subsidiaries in number of foreign countries	47			4	21	14	7	1
Number of customers accounting for 10% or more of total revenue	0	0	0