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Derivative Financial Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Sep. 30, 2014
Derivative
Foreign Currency Forward Contracts Maximum Maturity Period	15 months
Maturity period of foreign currency forward contracts, Maximum	3 months
Cash Flow Hedging [Member]
Derivative
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net	$ 7

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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