Goodwill And Acquisition-Related Intangibles (Schedule Of Changes In The Carrying Amount Of Goodwill) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Goodwill [Roll Forward]
Goodwill, Gross, Beginning balance	$ 2,081	$ 2,091
Accumulated impairment, beginning balance	(368)	(368)
Goodwill, Net, Beginning balance	1,713	1,723
Goodwill acquired	0	0
Effects of foreign currency translation	(3)	(10)
Goodwill, Gross, Ending balance	2,078	2,081
Accumulated impairment, ending balance	(368)	(368)
Goodwill, Net, Ending balance	$ 1,710	$ 1,713