| **Goodwill And Acquisition-Related Intangibles, Net (Tables)**     | 3 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 three months ended June 30, 2013 are as follows (in millions): As of March 31, 2013 Activity Effects of Foreign Currency Translation As of June 30, 2013Goodwill$2,089 $5 $(4) $2,090Accumulated impairment(368) — — (368)Total$1,721 $5 $(4) $1,722                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| Schedule Of Acquisition-Related Intangibles                        | Acquisition-related intangibles consisted of the following (in millions): As of June 30, 2013 As of March 31, 2013 GrossCarryingAmount AccumulatedAmortization Acquisition-RelatedIntangibles, Net GrossCarryingAmount AccumulatedAmortization Acquisition-RelatedIntangibles, NetDeveloped and core technology$527 $(339) $188 $527 $(324) $203Trade names and trademarks130 (101) 29 130 (99) 31Registered user base and other intangibles87 (85) 2 87 (84) 3Carrier contracts and related85 (74) 11 85 (73) 12In-process research and development4 — 4 4 — 4Total$833 $(599) $234 $833 $(580) $253 |
| Schedule Of Amoritization Of Intangibles                           | Amortization of intangibles for the three months ended June 30, 2013 and 2012 are classified in the Condensed Consolidated Statement of Operations as follows (in millions): Three Months Ended June 30, 2013 2012Cost of product$9 $9Cost of service and other6 6Operating expenses4 7Total$19 $22                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
| Schedule Of Future Amortization Of Acquisition-Related Intangibles | As of June 30, 2013, 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, 2014 (remaining nine months)$5520156620165320173220181320198Thereafter7Total$234                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |

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| - Definition
Schedule Of Classification Of Amoritization Of Intangibles [Table Text Block]
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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.
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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.
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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=7658586&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=7658586&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 2 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13854-109267Reference 2: 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=14024403&loc=d3e13816-109267Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 47 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.
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