Derivatives 1 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
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	$ 8	$ 7
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)