Deferred Revenue (Details) - USD ($) $ in Millions	Mar. 31, 2017	Mar. 31, 2016
Current:
Total deferred revenue (billed or collected) - current	$ 2,222	$ 2,197
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	794	737
Total deferred revenue (billed or collected)	3,016	2,934
Subscription and Maintenance
Current:
Total deferred revenue (billed or collected) - current	1,948	1,990
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	769	712
Professional Services
Current:
Total deferred revenue (billed or collected) - current	135	116
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	19	21
Software Fees and Other
Current:
Total deferred revenue (billed or collected) - current	139	91
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	$ 6	$ 4