| **Balance Sheet Details (Tables)**               | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
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| **Balance Sheet Related Disclosures [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| Inventories Schedule                             | Inventories as of December 31, 2012 and March 31, 2012 consisted of (in millions):  As ofDecember 31, 2012 As of March 31, 2012Raw materials and work in process$1 $—Finished goods58 59Inventories$59 $59                                                                                                                                                                                                                                                                           |
| Property And Equipment, Net Schedule             | Property and equipment, net, as of December 31, 2012 and March 31, 2012 consisted of (in millions):  As ofDecember 31, 2012 As of March 31, 2012Computer equipment and software$649 $575Buildings340 339Leasehold improvements131 121Office equipment, furniture and fixtures72 72Land64 64Warehouse equipment and other10 10Construction in progress9 38 1,275 1,219Less: accumulated depreciation(725) (651)Property and equipment, net$550 $568 |
| Accrued And Other Current Liabilities Schedule   | Accrued and other current liabilities as of December 31, 2012 and March 31, 2012 consisted of (in millions):  As ofDecember 31, 2012 As of March 31, 2012Other accrued expenses$332 $441Deferred net revenue (other)198 85Accrued compensation and benefits187 233Accrued royalties123 98Accrued and other current liabilities$840 $857                                                                                                                                          |

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| - Definition
Tabular disclosure of the useful life and salvage value of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 3: 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 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682
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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.
+ References
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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