Balance Sheet Details (Deferred Net Revenue) (Details) - USD ($) $ in Millions	6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Mar. 31, 2021
Deferred Revenue Arrangement [Line Items]
Deferred Revenue, Current	$ 1,322		$ 1,527	[1]
Deferred Revenue, Revenue Recognized	1,504	$ 985
Online enabled games [Member]
Deferred Revenue Arrangement [Line Items]
Deferred Revenue, Current	1,322		1,527
Other [Member]
Deferred Revenue Arrangement [Line Items]
Deferred Revenue, Current	99		95
Noncurrent [Member]
Deferred Revenue Arrangement [Line Items]
Deferred Revenue, Noncurrent	23		14
Total [Member]
Deferred Revenue Arrangement [Line Items]
Deferred Revenue	$ 1,444		$ 1,636

[1] Derived from audited Consolidated Financial Statements.