Derivative Financial Instruments (Schedule Of Derivative Instruments, Gains (Losses) Not Designated As Hedging Instruments) (Details) (Interest and Other Income (Expense), net, USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010
Interest and Other Income (Expense), net
Derivative Instruments, Gain (Loss) [Line Items]
Foreign currency forward contracts not designated as hedging instruments, Amount of Gain (Loss) Recognized in Income on Derivative	$ 19	$ 12	$ 33	$ 7