Goodwill And Acquisition-Related Intangibles, Net (Schedule Of Acquisition-Related Intangibles) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Mar. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 608	$ 608
Accumulated amortization	(600)	(551)
Acquisition-related intangibles, net	8	57
Developed And Core Technology
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	412	412
Accumulated amortization	(412)	(368)
Acquisition-related intangibles, net	0	44
Trade Names And Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	106	106
Accumulated amortization	(98)	(93)
Acquisition-related intangibles, net	8	13
Registered User Base And Other Intangibles
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	5	5
Accumulated amortization	(5)	(5)
Acquisition-related intangibles, net	0	0
Carrier Contracts And Related
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	85	85
Accumulated amortization	(85)	(85)
Acquisition-related intangibles, net	$ 0	$ 0

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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