Interest And Other Income (Expense), Net (Schedule Of Interest And Other Income (Expense), Net) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Interest and Other Income [Abstract]
Interest expense	$ (29)	$ (20)	$ (1)
Interest income	6	9	9
Net gain (loss) on foreign currency transactions	2	(29)	12
Net gain (loss) on foreign currency forward contracts	(2)	21	(12)
Other income, net	2	2	2
Interest and other income (expense), net	$ (21)	$ (17)	$ 10