| **Balance Sheet Details**                        | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
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| **Balance Sheet Related Disclosures [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| Balance Sheet Details                            | (8) BALANCE SHEET DETAILSInventoriesInventories as of December 31, 2015 and March 31, 2015 consisted of (in millions): As of December 31, 2015As of March 31, 2015Finished goods$41$35Raw materials and work in process11Inventories$42$36Property and Equipment, NetProperty and equipment, net, as of December 31, 2015 and March 31, 2015 consisted of (in millions):  As of December 31, 2015 As of March 31, 2015Computer, equipment and software$663 $655Buildings303 315Leasehold improvements125 126Equipment, furniture and fixtures, and other73 73Land61 62Construction in progress12 7 1,237 1,238Less: accumulated depreciation(822) (779)Property and equipment, net$415 $459During the three and nine months ended December 31, 2015, depreciation expense associated with property and equipment was $31 million and $91 million, respectively. During the three and nine months ended December 31, 2014, depreciation expense associated with property and equipment was $32 million and $96 million, respectively. Accrued and Other Current LiabilitiesAccrued and other current liabilities as of December 31, 2015 and March 31, 2015 consisted of (in millions):  As of December 31, 2015 As of March 31, 2015Other accrued expenses$308 $298Accrued compensation and benefits218 263Accrued royalties216 119Deferred net revenue (other)98 114Accrued and other current liabilities$840 $794Deferred net revenue (other) includes the deferral of subscription revenue, deferrals related to our Switzerland distribution business, advertising revenue, licensing arrangements, and other revenue for which revenue recognition criteria has not been met.Deferred Net Revenue (Online-Enabled Games)Deferred net revenue (online-enabled games) was $1,844 million and $1,283 million as of December 31, 2015 and March 31, 2015, respectively. Deferred net revenue (online-enabled games) generally includes the unrecognized revenue from bundled sales of online-enabled games for which we do not have vendor-specific objective evidence of fair value (“VSOE”) for the obligation to provide unspecified updates. We recognize revenue from the sale of online-enabled games for which we do not have VSOE for the unspecified updates on a straight-line basis, generally over an estimated nine-month period beginning in the month after shipment for physical games sold through retail and an estimated six-month period for digitally-distributed games. However, we expense the cost of revenue related to these transactions during the period in which the product is delivered (rather than on a deferred basis). |

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