| **Goodwill And Acquisition-Related Intangibles, Net (Schedule Of Acquisition-Related Intangibles) (Details) - USD ($) $ in Millions** | Sep. 30, 2016 | Mar. 31, 2016 |
|---------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Finite-Lived Intangible Assets**                                                                                                    |          |          |  |
| Gross carrying amount                                                                                                                 | $ 608         | $ 608         |  |
| Accumulated amortization                                                                                                              | (580)         | (551)         |  |
| Acquisition-related intangibles, net                                                                                                  | 28            | 57            | [1] |
| Developed And Core Technology                                                                                                         |          |          |  |
| **Finite-Lived Intangible Assets**                                                                                                    |          |          |  |
| Gross carrying amount                                                                                                                 | 412           | 412           |  |
| Accumulated amortization                                                                                                              | (395)         | (368)         |  |
| Acquisition-related intangibles, net                                                                                                  | 17            | 44            |  |
| Trade Names And Trademarks                                                                                                            |          |          |  |
| **Finite-Lived Intangible Assets**                                                                                                    |          |          |  |
| Gross carrying amount                                                                                                                 | 106           | 106           |  |
| Accumulated amortization                                                                                                              | (95)          | (93)          |  |
| Acquisition-related intangibles, net                                                                                                  | 11            | 13            |  |
| Registered User Base And Other Intangibles                                                                                            |          |          |  |
| **Finite-Lived Intangible Assets**                                                                                                    |          |          |  |
| Gross carrying amount                                                                                                                 | 5             | 5             |  |
| Accumulated amortization                                                                                                              | (5)           | (5)           |  |
| Acquisition-related intangibles, net                                                                                                  | 0             | 0             |  |
| Carrier Contracts And Related                                                                                                         |          |          |  |
| **Finite-Lived Intangible Assets**                                                                                                    |          |          |  |
| Gross carrying amount                                                                                                                 | 85            | 85            |  |
| Accumulated amortization                                                                                                              | (85)          | (85)          |  |
| Acquisition-related intangibles, net                                                                                                  | $ 0           | $ 0           |  |
|                                                                                                                                       |
| [1]Derived from audited Consolidated Financial Statements.                                                                            |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.
+ 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)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.
+ 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)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275
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| X                                                                                                                                                                                                                                                                                                                                                                                                                            |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.
+ 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)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275
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| X                                                                                                                                                                                   |
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| X                                                                                                                                                                    |
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| X                                                                                                                                                                                          |
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| X                                                                                                                                                                           |
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