Deferred Revenue (Details) - USD ($) $ in Millions	Dec. 31, 2015	Mar. 31, 2015
Current:
Total deferred revenue (billed or collected) - current	$ 1,983	$ 2,114
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	667	863
Total deferred revenue (billed or collected)	2,650	2,977
Subscription and Maintenance
Current:
Total deferred revenue (billed or collected) - current	1,793	1,966
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	640	832
Professional Services
Current:
Total deferred revenue (billed or collected) - current	113	115
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	24	28
Software Fees and Other
Current:
Total deferred revenue (billed or collected) - current	77	33
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	$ 3	$ 3