Deferred Revenue (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Current:
Total deferred revenue (billed or collected) - current	$ 2,459	$ 2,465
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	890	969
Total deferred revenue (billed or collected)	3,349	3,434
Subscription and Maintenance [Member]
Current:
Total deferred revenue (billed or collected) - current	2,277	2,290
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	863	934
Professional Services [Member]
Current:
Total deferred revenue (billed or collected) - current	149	154
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	26	33
Software Fees and Other [Member]
Current:
Total deferred revenue (billed or collected) - current	33	21
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	$ 1	$ 2