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Deferred Revenue (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Current:
Total deferred revenue (billed or collected) - current	$ 2,114us-gaap_DeferredRevenueCurrent	$ 2,419us-gaap_DeferredRevenueCurrent
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	863us-gaap_DeferredRevenueNoncurrent	872us-gaap_DeferredRevenueNoncurrent
Total deferred revenue (billed or collected)	2,977us-gaap_DeferredRevenue	3,291us-gaap_DeferredRevenue
Subscription and Maintenance
Current:
Total deferred revenue (billed or collected) - current	1,966	2,237
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	832	845
Professional Services
Current:
Total deferred revenue (billed or collected) - current	115	149
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	28	26
Software Fees and Other
Current:
Total deferred revenue (billed or collected) - current	33	33
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	$ 3	$ 1