Derivatives 1 (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Interest Rate Swaps | Fair Value Hedges | Interest Expense, Net
Effect of interest rate and foreign exchange derivatives
Amount of net (gain)/loss from derivative instruments recognized in the Condensed Consolidated Statements of Operations	$ 0	$ (3)	$ 0	$ (6)
Foreign Currency Contracts | Other Expenses, Net
Effect of interest rate and foreign exchange derivatives
Amount of net (gain)/loss from derivative instruments recognized in the Condensed Consolidated Statements of Operations	$ (8)	$ (17)	$ 3	$ (12)