| **Balance Sheet Details**                        | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
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| **Balance Sheet Related Disclosures [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Balance Sheet Details                            | (8) BALANCE SHEET DETAILSInventoriesInventories as of September 30, 2016 and March 31, 2016 consisted of (in millions): As of September 30, 2016As of March 31, 2016Finished goods$41$32Raw materials and work in process91Inventories$50$33Property and Equipment, NetProperty and equipment, net, as of September 30, 2016 and March 31, 2016 consisted of (in millions):  As of September 30, 2016 As of March 31, 2016Computer, equipment and software$709 $684Buildings315 313Leasehold improvements129 129Equipment, furniture and fixtures, and other81 80Land61 61Construction in progress3 15 1,298 1,282Less: accumulated depreciation(867) (843)Property and equipment, net$431 $439During the three and six months ended September 30, 2016, depreciation expense associated with property and equipment was $28 million and $57 million, respectively.  During the three and six months ended September 30, 2015 depreciation expense associated with property and equipment was $30 million and $60 million respectively. Accrued and Other Current LiabilitiesAccrued and other current liabilities as of September 30, 2016 and March 31, 2016 consisted of (in millions):  As of September 30, 2016 As of March 31, 2016Other accrued expenses$289 $218Accrued compensation and benefits175 256Accrued royalties162 159Deferred net revenue (other)151 77Accrued and other current liabilities$777 $710Deferred 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 $1,067 million and $1,458 million as of September 30, 2016 and March 31, 2016, 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 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 generally during the period in which the product is delivered (rather than on a deferred basis). |

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