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Derivative Financial Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Derivative [Line Items]
Foreign Currency Forward And Option Contracts Maximum Maturity Period	15 months
Maturity period of foreign currency forward contracts, Maximum	3 months
Foreign currency contracts to sell [Member] \| Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Notional amount		$ 219
Cash Flow Hedging [Member]
Derivative [Line Items]
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net	$ 9	$ 4	$ 4

Aggregate impact of foreign currency derivatives on earnings for the period. Includes impact of foreign currency cash flow hedge ineffectiveness and the ineffectiveness of fair value hedging derivatives and full change in fair value of the foreign currency derivatives not designated as hedging instruments.

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