Derivatives 1 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Interest Rate Swaps [Member] | Fair Value Hedges [Member] | Interest Expense, Net [Member]
Effect of interest rate and foreign exchange derivatives
Amount of net gain from derivative instruments recognized in the Condensed Consolidated Statements of Operations	$ (3)	$ (3)	$ (6)	$ (6)
Foreign Currency Contracts [Member] | Other Expenses, Net [Member]
Effect of interest rate and foreign exchange derivatives
Amount of net gain from derivative instruments recognized in the Condensed Consolidated Statements of Operations	$ (17)	$ (6)	$ (12)	$ (15)