Description Of Business And Basis of Presentation New revenue standard adoption - Balance Sheet at Period Start (Details) - USD ($) $ in Millions	Mar. 31, 2019	Apr. 01, 2018	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Condensed Balance Sheet Statements, Captions [Line Items]
Receivables, Net	$ 623		$ 385
Deferred income taxes, net	35		84
Deferred net revenue, other	94		108
Deferred net revenue (online-enabled games)	1,100		1,622
Retained Earnings (Accumulated Deficit)	5,358		4,062
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (30)		(127)	$ (19)	$ (16)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Receivables, Net		$ 158
Deferred income taxes, net		(64)
Sales return and price protection reserves		158
Deferred net revenue, other		(3)
Deferred net revenue (online-enabled games)		(673)
Retained Earnings (Accumulated Deficit)		590
Accumulated Other Comprehensive Income (Loss), Net of Tax		22
Accounting Standards Update 2014-09 [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Receivables, Net		543
Deferred income taxes, net		20
Sales return and price protection reserves		158
Deferred net revenue, other		105
Deferred net revenue (online-enabled games)		949
Retained Earnings (Accumulated Deficit)		4,652
Accumulated Other Comprehensive Income (Loss), Net of Tax		$ (105)
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Receivables, Net			385
Deferred income taxes, net			84
Sales return and price protection reserves			0
Deferred net revenue, other			108
Deferred net revenue (online-enabled games)			1,622
Retained Earnings (Accumulated Deficit)			4,062
Accumulated Other Comprehensive Income (Loss), Net of Tax			$ (127)