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Derivatives 1 (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Interest Rate Swaps [Member] | Fair Value Hedging [Member] | Interest Expense, Net [Member]
       
Effect of interest rate and foreign exchange derivatives on Consolidated Statements of Operations        
Amount of Net (Gain)/Loss Recognized in the Condensed Consolidated Statement of Operations $ (3) $ (3) $ (6) $ (6)
Foreign Exchange 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 Recognized in the Condensed Consolidated Statement of Operations $ 2 $ (6) $ 10 $ 1