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Related Party Balances and Transactions (Narrative) (Details) (Investee [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Mar. 31, 2015
Investee [Member]
 
Related Party Transaction [Line Items]  
Revenue from related parties $ 114us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_InvesteeMember
Accounts receivable, related parties, current $ 9us-gaap_AccountsReceivableRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_InvesteeMember