Segment Information (Net Revenue By Platform) (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Net Revenue by Platform [Line Items]
Net revenue	$ 1,459	$ 1,209
Console
Net Revenue by Platform [Line Items]
Net revenue	932	760
PC and other
Net Revenue by Platform [Line Items]
Net revenue	325	253
Mobile
Net Revenue by Platform [Line Items]
Net revenue	$ 202	$ 196