Derivatives 2 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Mar. 31, 2011	Dec. 31, 2011 6.125% Notes due December 2014 [Member]	Dec. 31, 2011 Interest Rate Swap [Member]	Mar. 31, 2009 Interest Rate Swap [Member]	Dec. 31, 2011 Other Current Assets [Member]	Mar. 31, 2011 Other Current Assets [Member]	Dec. 31, 2011 Other Noncurrent Assets, Net [Member]	Mar. 31, 2011 Other Noncurrent Assets, Net [Member]	Dec. 31, 2011 Accrued Expenses and Other Current Liabilities [Member]	Mar. 31, 2011 Accrued Expenses and Other Current Liabilities [Member]
Derivatives (Textual) [Abstract]
Notional amount of fair value hedge instruments						$ 500
Fair value of interest rate derivative assets		27		15				10	11	17	4
Notional amount of cash flow hedge instruments							250
Fair value of foreign currency contracts included in "Other current assets"								16	7
Fair value of foreign currency contracts included in "Accrued expenses and other current liabilities"												6	1
Debt Instrument [Line Items]
Long-term debt, interest rate					6.125%
Derivative Instrument (Textual) [Abstract]
Total value of senior notes subject to fair value interest rate swaps		500
Accumulated other comprehensive income loss reclassified into interest expense	1		4
Purchase and sale of notional value of foreign currency contracts outstanding		826
Tenure of foreign currency contracts outstanding		less than three months
Net fair value of foreign currency contracts		$ 10		$ 6