Deferred Revenue (Details) - USD ($) $ in Millions	Jun. 30, 2016	Mar. 31, 2016
Current:
Total deferred revenue (billed or collected) - current	$ 2,027	$ 2,197
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	654	737
Total deferred revenue (billed or collected)	2,681	2,934
Subscription and Maintenance
Current:
Total deferred revenue (billed or collected) - current	1,826	1,990
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	631	712
Professional Services
Current:
Total deferred revenue (billed or collected) - current	124	116
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	20	21
Software Fees and Other
Current:
Total deferred revenue (billed or collected) - current	77	91
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	$ 3	$ 4