Deferred Revenue (Details) - USD ($) $ in Millions	Jun. 30, 2015	Mar. 31, 2015
Current:
Total deferred revenue (billed or collected) - current	$ 2,040	$ 2,114
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	720	863
Total deferred revenue (billed or collected)	2,760	2,977
Subscription and Maintenance
Current:
Total deferred revenue (billed or collected) - current	1,894	1,966
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	689	832
Professional Services
Current:
Total deferred revenue (billed or collected) - current	110	115
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	29	28
Software Fees and Other
Current:
Total deferred revenue (billed or collected) - current	36	33
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	$ 2	$ 3