Deferred Revenue (Details) (USD $) In Millions	Jun. 30, 2011	Mar. 31, 2011
Current:
Total deferred revenue (billed or collected) - current	$ 2,475	$ 2,600
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	909	969
Total deferred revenue (billed or collected)	3,384	3,569
Subscription and maintenance [Member]
Current:
Total deferred revenue (billed or collected) - current	2,319	2,444
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	878	940
Professional services [Member]
Current:
Total deferred revenue (billed or collected) - current	145	145
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	28	27
Financing obligations and other [Member]
Current:
Total deferred revenue (billed or collected) - current	11	11
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	$ 3	$ 2