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Deferred Revenue (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Mar. 31, 2014
Current:
Total deferred revenue (billed or collected) - current	$ 1,992us-gaap_DeferredRevenueCurrent	$ 2,419us-gaap_DeferredRevenueCurrent
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	761us-gaap_DeferredRevenueNoncurrent	872us-gaap_DeferredRevenueNoncurrent
Total deferred revenue (billed or collected)	2,753us-gaap_DeferredRevenue	3,291us-gaap_DeferredRevenue
Subscription and Maintenance [Member]
Current:
Total deferred revenue (billed or collected) - current	1,841	2,237
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	728	845
Professional Services [Member]
Current:
Total deferred revenue (billed or collected) - current	123	149
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	29	26
Software Fees and Other [Member]
Current:
Total deferred revenue (billed or collected) - current	28	33
Noncurrent:
Total deferred revenue (billed or collected) - noncurrent	$ 4	$ 1