Derivatives 2 (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012 6.125% Notes due December 2014 [Member]	Mar. 31, 2012 Interest Rate Swap [Member]	Mar. 31, 2009 Interest Rate Swap [Member]	Mar. 31, 2012 Fiscal Year 2013 Hedging Program [Member]	Mar. 31, 2012 Other Current Assets [Member]	Mar. 31, 2011 Other Current Assets [Member]	Mar. 31, 2012 Other Noncurrent Assets, Net [Member]	Mar. 31, 2011 Other Noncurrent Assets, Net [Member]
Derivatives, Fair Value [Line Items]
Notional amount of fair value hedge instruments				$ 500
Notional amount of cash flow hedge instruments					250
Fair value of interest rate derivative assets	27	15					11	11	16	4
Fair value of foreign currency contracts included in "Other current assets"	2	7
Fair value of foreign currency contracts included in "Accrued expenses and other current liabilities"	4	1
Foreign currency contracts consisting of purchase and sales contracts						257
Debt Instrument [Line Items]
Long-term debt, interest rate			6.125%
Derivatives (Textual) [Abstract]
Total value of senior notes subject to fair value interest rate swaps	500
Purchase and sale of notional value of foreign currency contracts outstanding	893	191
Tenure of foreign currency contracts outstanding	less than six months	less than three months
Net fair value of foreign currency contracts	$ (2)	$ 6