| **Balance Sheet Details (Tables)**               | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
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| **Balance Sheet Related Disclosures [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| Inventories Schedule                             | Inventories as of March 31, 2014 and 2013 consisted of (in millions):  As of March 31, 2014 2013Finished goods$55 $41Raw materials and work in process1 1Inventories$56 $42                                                                                                                                                                                                                                                                               |
| Property And Equipment, Net Schedule             | Property and equipment, net, as of March 31, 2014 and 2013 consisted of (in millions):  As of March 31, 2014 2013Computer equipment and software$718 $660Buildings327 336Leasehold improvements129 129Office equipment, furniture and fixtures67 72Land63 64Warehouse equipment and other10 10Construction in progress5 8 1,319 1,279Less accumulated depreciation(809) (731)Property and equipment, net$510 $548 |
| Accrued And Other Current Liabilities Schedule   | Accrued and other current liabilities as of March 31, 2014 and 2013 consisted of (in millions):  As of March 31, 2014 2013Other accrued expenses$328 $338Accrued compensation and benefits259 217Accrued royalties73 103Deferred net revenue (other)121 79Accrued and other current liabilities$781 $737                                                                                                                                        |

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| - Definition
The entire disclosure for accounts payable and accrued liabilities at the end of the reporting period.
+ References
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| - Definition
The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -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 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13-14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682
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| - Definition
Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 2 -Paragraph 6 -Subparagraph a,b,c -Article 5
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