Segment Information (Net Revenue By Revenue Composition ) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting, Revenue Reconciling Item
Net revenue	$ 1,286	$ 959	$ 2,423	$ 2,408
Live services, net revenue [Member]
Segment Reporting, Revenue Reconciling Item
Net revenue	412	408	1,022	909
Mobile, net revenue [Member]
Segment Reporting, Revenue Reconciling Item
Net revenue	220	158	451	327
Full game downloads, net revenue [Member]
Segment Reporting, Revenue Reconciling Item
Net revenue	148	123	264	332
Total Digital, net revenue [Member]
Segment Reporting, Revenue Reconciling Item
Net revenue	780	689	1,737	1,568
Total Packaged goods and other, net revenue [Member]
Segment Reporting, Revenue Reconciling Item
Net revenue	$ 506	$ 270	$ 686	$ 840