| **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, 2016 and March 31, 2016 consisted of (in millions): As of December 31, 2016As of March 31, 2016Finished goods$34$32Raw materials and work in process11Inventories$35$33Property and Equipment, NetProperty and equipment, net, as of December 31, 2016 and March 31, 2016 consisted of (in millions):  As of December 31, 2016 As of March 31, 2016Computer, equipment and software$702 $684Buildings312 313Leasehold improvements126 129Equipment, furniture and fixtures, and other80 80Land61 61Construction in progress8 15 1,289 1,282Less: accumulated depreciation(865) (843)Property and equipment, net$424 $439During the three and nine months ended December 31, 2016, depreciation expense associated with property and equipment was $29 million and $86 million, respectively.  During the three and nine months ended December 31, 2015 depreciation expense associated with property and equipment was $31 million and $91 million respectively. Accrued and Other Current LiabilitiesAccrued and other current liabilities as of December 31, 2016 and March 31, 2016 consisted of (in millions):  As of December 31, 2016 As of March 31, 2016Other accrued expenses$306 $218Accrued compensation and benefits224 256Accrued royalties226 159Deferred net revenue (other)145 77Accrued and other current liabilities$901 $710Deferred net revenue (other) includes the deferral of subscription revenue, 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 $1,971 million and $1,458 million as of December 31, 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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