Segment Information (Net Revenue By Revenue Composition ) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting, Revenue Reconciling Item
Net revenue	$ 1,151	$ 1,348	$ 2,610	$ 2,557
Recognized at a point in time
Segment Reporting, Revenue Reconciling Item
Net revenue	337	629	779	877
Recognized over time
Segment Reporting, Revenue Reconciling Item
Net revenue	814	719	1,831	1,680
Full game, net revenue [Member]
Segment Reporting, Revenue Reconciling Item
Net revenue	282	580	641	842
Full game downloads, net revenue [Member]
Segment Reporting, Revenue Reconciling Item
Net revenue	163	181	386	314
Packaged goods, net revenue [Member]
Segment Reporting, Revenue Reconciling Item
Net revenue	119	399	255	528
Live services and other, net revenue [Member]
Segment Reporting, Revenue Reconciling Item
Net revenue	$ 869	$ 768	$ 1,969	$ 1,715