Derivatives 1 (Details) (USD $) In Millions	3 Months Ended	6 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Cash Flow Hedging [Member] \| Interest Expense [Member] \| Interest Rate Swap [Member]
Effect of interest rate and foreign exchange derivatives on Consolidated Statement of Operations
Amount of Net (Gain)/Loss Recognized in the Consolidated Statement of Operations	$ 0	$ 1	$ 0	$ 3
Fair Value Hedging [Member] \| Interest Expense [Member] \| Interest Rate Swap [Member]
Effect of interest rate and foreign exchange derivatives on Consolidated Statement of Operations
Amount of Net (Gain)/Loss Recognized in the Consolidated Statement of Operations	(3)	(3)	(6)	(6)
Other (gains) expenses, net [Member] \| Foreign Exchange Contract [Member]
Effect of interest rate and foreign exchange derivatives on Consolidated Statement of Operations
Amount of Net (Gain)/Loss Recognized in the Consolidated Statement of Operations	$ (6)	$ 21	$ 1	$ 8

- Definition

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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