Deferred Revenue (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Current:
Total deferred revenue (billed or collected) - current	$ 2,482	$ 2,658
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	975	972
Total deferred revenue (billed or collected)	3,457	3,630
Subscription and Maintenance [Member]
Current:
Total deferred revenue (billed or collected) - current	2,307	2,479
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	940	935
Professional Services [Member]
Current:
Total deferred revenue (billed or collected) - current	154	162
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	33	35
Software Fees and Other [Member]
Current:
Total deferred revenue (billed or collected) - current	21	17
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	$ 2	$ 2