Derivatives 2 (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 6.125% Senior Notes Due December 2014 [Member]	Mar. 31, 2013 Interest Rate Swaps [Member]	Mar. 31, 2009 Interest Rate Swaps [Member]	Mar. 31, 2013 Other Current Assets [Member]	Mar. 31, 2012 Other Current Assets [Member]	Mar. 31, 2013 Other Noncurrent Assets, Net [Member]	Mar. 31, 2012 Other Noncurrent Assets, Net [Member]	Mar. 31, 2012 Accrued Expenses and Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Notional value of interest rate swaps designated as fair value hedges				$ 500
Total value of Senior Notes subject to fair value interest rate swaps	500
Long-term debt, Interest rate			6.125%
Fair value of interest rate derivative assets	19	27				11	11	8	16
Notional value of interest rate swaps designated as cash ffow hedges					250
Notional value of purchase and sales contracts for foreign currency contracts outstanding	597	893
Tenure of foreign currency contracts outstanding	less than one month	less than six months
Net fair value of foreign currency contracts	1	(2)
Fair value of foreign currency contracts included in "Other current assets"						1	2
Fair value of foreign currency contracts included in "Accrued expenses and other current liabilities"										$ 4