Segment Information (Net Revenue By Platform) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Net Revenue by Platform [Line Items]
Net revenue	$ 1,673	$ 1,593	$ 4,283	$ 4,150
Console
Net Revenue by Platform [Line Items]
Net revenue	1,191	1,163	2,837	2,846
PC and other
Net Revenue by Platform [Line Items]
Net revenue	326	261	900	762
Mobile
Net Revenue by Platform [Line Items]
Net revenue	$ 156	$ 169	$ 546	$ 542