| **Balance Sheet Details (Property And Equipment, Net Schedule) (Details) - USD ($) $ in Millions** | Mar. 31, 2016 | Mar. 31, 2015 |
|----------------------------------------------------------------------------------------------------|---------------|---------------|
| **Property, Plant and Equipment [Line Items]**                                                     |          |          |
| Property and equipment, gross                                                                      | $ 1,282       | $ 1,238       |
| Less accumulated depreciation                                                                      | (843)         | (779)         |
| Property and equipment, net                                                                        | 439           | 459           |
| Computer equipment and software                                                                    |          |          |
| **Property, Plant and Equipment [Line Items]**                                                     |          |          |
| Property and equipment, gross                                                                      | 684           | 655           |
| Buildings                                                                                          |          |          |
| **Property, Plant and Equipment [Line Items]**                                                     |          |          |
| Property and equipment, gross                                                                      | 313           | 315           |
| Leasehold improvements                                                                             |          |          |
| **Property, Plant and Equipment [Line Items]**                                                     |          |          |
| Property and equipment, gross                                                                      | 129           | 126           |
| Equipment, furniture and fixtures, and other                                                       |          |          |
| **Property, Plant and Equipment [Line Items]**                                                     |          |          |
| Property and equipment, gross                                                                      | 80            | 73            |
| Land                                                                                               |          |          |
| **Property, Plant and Equipment [Line Items]**                                                     |          |          |
| Property and equipment, gross                                                                      | 61            | 62            |
| Construction in progress                                                                           |          |          |
| **Property, Plant and Equipment [Line Items]**                                                     |          |          |
| Property and equipment, gross                                                                      | $ 15          | $ 7           |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682
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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 accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.
+ References
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| X                                                                                                                                                                         |
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| X                                                                                                                                                          |
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| X                                                                                                                                                                       |
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| X                                                                                                                                                                 |
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| X                                                                                                                                                      |
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