Deferred Revenue (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Mar. 31, 2014
Current:
Total deferred revenue (billed or collected) - current	$ 2,205	$ 2,419
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	805	872
Total deferred revenue (billed or collected)	3,010	3,291
Subscription and Maintenance [Member]
Current:
Total deferred revenue (billed or collected) - current	2,033	2,237
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	778	845
Professional Services [Member]
Current:
Total deferred revenue (billed or collected) - current	145	149
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	24	26
Software Fees and Other [Member]
Current:
Total deferred revenue (billed or collected) - current	27	33
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	$ 3	$ 1