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)