| **Balance Sheet Details (Tables)**               | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
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| **Balance Sheet Related Disclosures [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| Inventories Schedule                             | Inventories as of December 31, 2013 and March 31, 2013 consisted of (in millions):  As of December 31, 2013 As of March 31, 2013Finished Goods$55 $41Raw materials and work in process— 1Inventories$55 $42                                                                                                                                                                                                                                                                          |
| Property And Equipment, Net Schedule             | Property and equipment, net, as of December 31, 2013 and March 31, 2013 consisted of (in millions):  As of December 31, 2013 As of March 31, 2013Computer equipment and software$704 $660Buildings334 336Leasehold improvements129 129Office equipment, furniture and fixtures70 72Land63 64Warehouse equipment and other10 10Construction in progress8 8 1,318 1,279Less: accumulated depreciation(800) (731)Property and equipment, net$518 $548 |
| Accrued And Other Current Liabilities Schedule   | Accrued and other current liabilities as of December 31, 2013 and March 31, 2013 consisted of (in millions):  As of December 31, 2013 As of March 31, 2013Other accrued expenses$373 $338Accrued compensation and benefits210 217Accrued royalties105 103Deferred net revenue (other)135 79Accrued and other current liabilities$823 $737                                                                                                                                        |

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| - Definition
Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation.
+ 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5
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| - Definition
Tabular disclosure of the (a) carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business (accounts payable); (b) other payables; and (c) accrued liabilities. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). An alternative caption includes accrued expenses.
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No definition available.
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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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