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Segment and Geographic Information 3 (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended									3 Months Ended	12 Months Ended
	Mar. 31, 2014 Customer	Mar. 31, 2013 Customer	Mar. 31, 2012 Customer	Mar. 31, 2014 Purchased Software [Member]	Mar. 31, 2012 Purchased Software [Member]	Mar. 31, 2014 Fiscal 2014 Plan [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 [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 Information [Line Items]
Intellectual property assets transaction value									$ 35
Severance costs							3	22	10		19	2	1
Rebalancing charges						171
Impairment		$ 55		$ 0	$ 0					$ 55
Segment Reporting Information, Additional Information [Abstract]
Number of customers accounting for 10% or more of total revenue	0	0	0

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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- Definition

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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