Deferred Revenue (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Mar. 31, 2013
Current:
Total deferred revenue (billed or collected) - current	$ 2,230	$ 2,482
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	899	975
Total deferred revenue (billed or collected)	3,129	3,457
Subscription and Maintenance [Member]
Current:
Total deferred revenue (billed or collected) - current	2,064	2,307
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	867	940
Professional Services [Member]
Current:
Total deferred revenue (billed or collected) - current	145	154
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	31	33
Software Fees and Other [Member]
Current:
Total deferred revenue (billed or collected) - current	21	21
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	$ 1	$ 2