Long-Lived Assets 6 (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended					3 Months Ended	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012 Purchased Software Products [Member]	Mar. 31, 2011 Purchased Software Products [Member]	Mar. 31, 2013 Purchased Software Products [Member] Enterprise Solutions [Member]	Mar. 31, 2013 Internally Developed Software Products [Member]	Mar. 31, 2012 Internally Developed Software Products [Member]	Mar. 31, 2011 Internally Developed Software Products [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment	$ 55			$ 0	$ 0	$ 55	$ 3	$ 9	$ 0
Uncertainty, Continued marketability of goods and services	The Company evaluates the useful lives and recoverability of capitalized software and other intangible assets when events or changes in circumstances indicate that an impairment may exist. These evaluations require complex assumptions about key factors such as future customer demand, technology trends, and the impact of those factors on the technology the Company acquires and develops for its products. Impairment or revisions to useful lives could result from the use of alternative assumptions that reflect reasonably possible outcomes related to future customer demand or technology trends for assets within the Enterprise Solutions segment.
Accumulated goodwill impairment losses	111	111
Goodwill impairments	$ 0	$ 0	$ 0