Segment Information (Net Revenue By Platform) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net Revenue by Platform [Line Items]
Revenue, Net	$ 990	$ 695	$ 2,204	$ 1,644
Xbox One, PLAYSTATION 4
Net Revenue by Platform [Line Items]
Revenue, Net	317	0	610	0
Xbox 360, PLAYSTATION 3
Net Revenue by Platform [Line Items]
Revenue, Net	308	298	851	792
Other consoles
Net Revenue by Platform [Line Items]
Revenue, Net	6	11	9	15
Total consoles
Net Revenue by Platform [Line Items]
Revenue, Net	631	309	1,470	807
PC and Browsers, net revenue
Net Revenue by Platform [Line Items]
Revenue, Net	208	274	439	572
Mobile, net revenue
Net Revenue by Platform [Line Items]
Revenue, Net	123	75	246	188
Other, net revenue
Net Revenue by Platform [Line Items]
Revenue, Net	$ 28	$ 37	$ 49	$ 77