Derivatives 1 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 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)/loss from derivative instruments recognized in the Condensed Consolidated Statements of Operations	$ (2)	$ (3)	$ (8)	$ (9)
Foreign Currency Contracts [Member] | Other Expenses, Net [Member]
Effect of interest rate and foreign exchange derivatives
Amount of net (gain)/loss from derivative instruments recognized in the Condensed Consolidated Statements of Operations	$ (10)	$ (5)	$ (22)	$ (20)