Income Taxes (Schedule Of Unrecognized Tax Benefits) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Operating Loss Carryforwards [Line Items]
Unrecognized tax benefits, beginning balance	$ 297	$ 274
Increases in unrecognized tax benefits related to prior year tax positions	10	2
Decreases in unrecognized tax benefits related to prior year tax positions	(79)	(2)
Increases in unrecognized tax benefits related to current year tax positions	44	30
Decreases in unrecognized tax benefits related to settlements with taxing authorities	29	0
Reductions in unrecognized tax benefits due to lapse of applicable statute of limitations	(9)	(5)
Changes in unrecognized tax benefits due to foreign currency translation	(2)	(2)
Unrecognized tax benefits, ending balance	$ 232	$ 297