Deferred Revenue (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Mar. 31, 2012
Current:
Total deferred revenue (billed or collected) - current	$ 2,313	$ 2,658
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	882	972
Total deferred revenue (billed or collected)	3,195	3,630
Subscription and maintenance [Member]
Current:
Total deferred revenue (billed or collected) - current	2,146	2,479
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	844	935
Professional services [Member]
Current:
Total deferred revenue (billed or collected) - current	151	162
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	36	35
Financing obligations and other [Member]
Current:
Total deferred revenue (billed or collected) - current	16	17
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	$ 2	$ 2