Deferred Revenue (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Mar. 31, 2013
Current:
Total deferred revenue (billed or collected) - current	$ 2,151	$ 2,482
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	893	975
Total deferred revenue (billed or collected)	3,044	3,457
Subscription and Maintenance [Member]
Current:
Total deferred revenue (billed or collected) - current	1,987	2,307
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	862	940
Professional Services [Member]
Current:
Total deferred revenue (billed or collected) - current	142	154
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	30	33
Software Fees and Other [Member]
Current:
Total deferred revenue (billed or collected) - current	22	21
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	$ 1	$ 2