| **Goodwill And Acquisition-Related Intangibles, Net (Tables)**     | 12 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 fiscal year ended March 31, 2016 are as follows (in millions): As ofMarch 31, 2015 Activity Effects of Foreign Currency Translation As ofMarch 31, 2016Goodwill$2,081 $— $(3) $2,078Accumulated impairment(368) — — (368)Total$1,713 $— $(3) $1,710The changes in the carrying amount of goodwill for the fiscal year ended March 31, 2015 are as follows (in millions): As ofMarch 31, 2014 Activity Effects of Foreign Currency Translation As ofMarch 31, 2015Goodwill$2,091 $— $(10) $2,081Accumulated impairment(368) — — (368)Total$1,723 $— $(10) $1,713 |
| Schedule Of Acquisition-Related Intangibles                        | Acquisition-related intangibles, consisted of the following (in millions):  As of March 31, 2016 As of March 31, 2015 GrossCarryingAmount AccumulatedAmortization Acquisition-RelatedIntangibles, Net GrossCarryingAmount AccumulatedAmortization Acquisition-RelatedIntangibles, NetDeveloped and core technology$412 $(368) $44 $531 $(439) $92Trade names and trademarks106 (93) 13 130 (111) 19Registered user base and other intangibles5 (5) — 87 (87) —Carrier contracts and related85 (85) — 85 (85) —Total$608 $(551) $57 $833 $(722) $111                 |
| Schedule Of Amortization Of Intangible Assets                      | Amortization of intangibles for the fiscal years ended March 31, 2016, 2015 and 2014 are classified in the Consolidated Statement of Operations as follows (in millions):  Year Ended March 31, 2016 2015 2014Cost of service and other$33 $36 $27Cost of product14 16 33Operating expenses7 14 16Total$54 $66 $76                                                                                                                                                                                                                                                                                                                                                                                                                      |
| Schedule Of Future Amortization Of Acquisition-Related Intangibles | As of March 31, 2016, future amortization of acquisition-related intangibles that will be recorded in the Consolidated Statement of Operations is estimated as follows (in millions): Fiscal Year Ending March 31, 20173820181720192Total$57                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |

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| - Definition
Schedule Of Amortization Of Intangible Assets [Table Text Block]
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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.
+ References
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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