Goodwill And Acquisition-Related Intangibles, Net (Schedule Of Future Amortization Of Acquisition-Related Intangibles) (Details) - USD ($) $ in Millions	Sep. 30, 2016	Mar. 31, 2016	[1]
Goodwill and Intangible Assets Disclosure [Abstract]
2017 (remaining six months)	$ 9
2018	17
2019	2
Total	$ 28	$ 57

[1] Derived from audited Consolidated Financial Statements.