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Derivatives 1 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Interest Rate Swaps [Member] \| Fair Value Hedges [Member] \| Interest Expense, Net [Member]
Effect of interest rate and foreign exchange derivatives on Consolidated Statements of Operations
Amount of net (gain)/loss from derivative instruments recognized in the Condensed Consolidated Statements of Operations	$ (3)	$ (3)	$ (6)	$ (6)
Foreign Currency Contracts [Member] \| Other (Gains) Expenses, Net [Member]
Effect of interest rate and foreign exchange derivatives on Consolidated Statements of Operations
Amount of net (gain)/loss from derivative instruments recognized in the Condensed Consolidated Statements of Operations	$ (6)	$ 2	$ (15)	$ 10

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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