Pension Benefits (Schedule Of Sensitivity To Changes In Weighted-Average Discount Rate For Pension Plans) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2014
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
One percentage point increase on projected benefit obligation	$ (35)
One percentage point decrease on projected benefit obligation	40
One percentage point increase on net periodic pension cost	(2)
One percentage point decrease on net periodic pension cost	2
Foreign Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
One percentage point increase on projected benefit obligation	(97)
One percentage point decrease on projected benefit obligation	119
One percentage point increase on net periodic pension cost	(3)
One percentage point decrease on net periodic pension cost	$ 4