Goodwill And Acquisition-Related Intangibles, Net (Schedule Of Changes In The Carrying Amount Of Goodwill) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Sep. 30, 2014
Goodwill [Roll Forward]
Goodwill, Gross, Beginning balance	$ 2,091
Accumulated impairment, beginning balance	(368)
Goodwill, Net, Beginning balance	1,723	[1]
Goodwill acquired	0
Effects of foreign currency translation	0
Goodwill, Gross, Ending balance	2,091
Accumulated impairment, ending balance	(368)
Goodwill, Net, Ending balance	$ 1,723

[1] Derived from audited consolidated financial statements.