| **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, 2016 are as follows (in millions): As of March 31, 2016 Activity Effects of Foreign Currency Translation As of December 31, 2016Goodwill$2,078 $— $(6) $2,072Accumulated impairment(368) — — (368)Total$1,710 $— $(6) $1,704                                                                                                                                                                                                                                                                                                                                                |
| Schedule Of Acquisition-Related Intangibles                        | Acquisition-related intangibles consisted of the following (in millions): As of December 31, 2016 As of March 31, 2016 GrossCarryingAmount AccumulatedAmortization Acquisition-RelatedIntangibles, Net GrossCarryingAmount AccumulatedAmortization Acquisition-RelatedIntangibles, NetDeveloped and core technology$412 $(412) $— $412 $(368) $44Trade names and trademarks106 (97) 9 106 (93) 13Registered user base and other intangibles5 (5) — 5 (5) —Carrier contracts and related85 (85) — 85 (85) —Total$608 $(599) $9 $608 $(551) $57 |
| Schedule Of Amoritization Of Intangibles                           | Amortization of intangibles for the three and nine months ended December 31, 2016 and 2015 are classified in the Condensed Consolidated Statement of Operations as follows (in millions): Three Months Ended December 31, Nine Months Ended December 31, 2016 2015 2016 2015Cost of service and other$— $9 $16 $25Cost of product18 3 27 10Operating expenses2 2 5 6Total$20 $14 $48 $41                                                                                                                                                                                                                                                                   |
| Schedule Of Future Amortization Of Acquisition-Related Intangibles | As of December 31, 2016, 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, 2017 (remaining three months)$12018620192Total$9                                                                                                                                                                                                                                                                                                                                                                                                                                                       |

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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=66006027&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=66006027&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
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=66006027&loc=d3e16323-109275
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