Description Of Business And Basis of Presentation New revenue standard adoption - Balance Sheet at Period End (Details) - USD ($) $ in Millions	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Condensed Balance Sheet Statements, Captions [Line Items]
Receivables, Net	$ 623	$ 385
Other current assets	313	288
Deferred income taxes, net	35	84
Other assets	114	89
Deferred net revenue, other	94	108
Deferred net revenue (online-enabled games)	1,100	1,622
Other liabilities	132	255
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	150
Other current assets	2
Deferred income taxes, net	(51)
Other assets	2
Sales return and price protection reserves	150
Deferred net revenue, other	(268)
Deferred net revenue (online-enabled games)	(304)
Other liabilities	12
Retained Earnings (Accumulated Deficit)	523
Accumulated Other Comprehensive Income (Loss), Net of Tax	(10)
Accounting Standards Update 2014-09 [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Receivables, Net	623
Other current assets	313
Deferred income taxes, net	35
Other assets	114
Sales return and price protection reserves	150
Deferred net revenue, other	94
Deferred net revenue (online-enabled games)	1,100
Other liabilities	132
Retained Earnings (Accumulated Deficit)	5,358
Accumulated Other Comprehensive Income (Loss), Net of Tax	(30)
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Receivables, Net	473
Other current assets	311
Deferred income taxes, net	86
Other assets	112
Sales return and price protection reserves	0
Deferred net revenue, other	362
Deferred net revenue (online-enabled games)	1,404
Other liabilities	120
Retained Earnings (Accumulated Deficit)	4,835
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (20)