| **Goodwill And Acquisition-Related Intangibles, Net (Tables)**     | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
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| **Goodwill and Intangible Assets Disclosure [Abstract]**           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| Schedule Of Changes In The Carrying Amount Of Goodwill             | The changes in the carrying amount of goodwill for the nine months ended December 31, 2015 are as follows (in millions): As of March 31, 2015 Activity Effects of Foreign Currency Translation As of December 31, 2015Goodwill$2,081 $— $(5) $2,076Accumulated impairment(368) — — (368)Total$1,713 $— $(5) $1,708                                                                                                                                                                                                                                                                                                                                                    |
| Schedule Of Acquisition-Related Intangibles                        | Acquisition-related intangibles consisted of the following (in millions): As of December 31, 2015 As of March 31, 2015 GrossCarryingAmount AccumulatedAmortization Acquisition-RelatedIntangibles, Net GrossCarryingAmount AccumulatedAmortization Acquisition-RelatedIntangibles, NetDeveloped and core technology$531 $(474) $57 $531 $(439) $92Trade names and trademarks130 (116) 14 130 (111) 19Registered user base and other intangibles87 (87) — 87 (87) —Carrier contracts and related85 (85) — 85 (85) —Total$833 $(762) $71 $833 $(722) $111 |
| Schedule Of Amoritization Of Intangibles                           | Amortization of intangibles for the three and nine months ended December 31, 2015 and 2014 are classified in the Condensed Consolidated Statement of Operations as follows (in millions): Three Months Ended December 31, Nine Months Ended December 31, 2015 2014 2015 2014Cost of service and other$9 $8 $25 $27Cost of product3 4 10 11Operating expenses2 4 6 11Total$14 $16 $41 $49                                                                                                                                                                                                                                                                             |
| Schedule Of Future Amortization Of Acquisition-Related Intangibles | As of December 31, 2015, future amortization of acquisition-related intangibles that will be recorded in the Condensed Consolidated Statement of Operations is estimated as follows (in millions): Fiscal Year Ending March 31, 2016 (remaining three months)$15201737201817201922020—2021—Total$71                                                                                                                                                                                                                                                                                                                                                                                                                            |

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| - Definition
Schedule Of Classification Of Amoritization Of Intangibles [Table Text Block]
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No definition available.
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No definition available.
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| - Definition
Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment.
+ References
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) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275
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| - Definition
Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.
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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267
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| - Definition
Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets.
+ References
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