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Goodwill And Acquisition-Related Intangibles, Net (Schedule Of Changes In The Carrying Amount Of Goodwill) (Details) (USD $)
In Millions
6 Months Ended
Sep. 30, 2011
Goodwill And Acquisition-Related Intangibles, Net [Abstract] 
Goodwill, beginning balance$ 1,478
Accumulated Impairment, beginning balance(368)
Goodwill, beginning balance1,110[1]
Goodwill acquired595
Effects of foreign currency translation(5)
Goodwill, ending balance2,068
Accumulated Impairment, ending balance(368)
Goodwill, ending balance$ 1,700
[1]Derived from audited consolidated financial statements.