Deferred Revenue (Details) - USD ($) $ in Millions	Sep. 30, 2016	Mar. 31, 2016
Current:
Total deferred revenue (billed or collected) - current	$ 1,790	$ 2,197
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	580	737
Total deferred revenue (billed or collected)	2,370	2,934
Subscription and Maintenance
Current:
Total deferred revenue (billed or collected) - current	1,596	1,990
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	558	712
Professional Services
Current:
Total deferred revenue (billed or collected) - current	122	116
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	18	21
Software Fees and Other
Current:
Total deferred revenue (billed or collected) - current	72	91
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	$ 4	$ 4