Balance Sheet Details (Deferred Net Revenue) (Details) - USD ($) $ in Millions	9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Mar. 31, 2020
Deferred Revenue Arrangement [Line Items]
Deferred Revenue, Current	$ 1,380		$ 945	[1]
Deferred Revenue, Revenue Recognized	1,002	$ 1,169
Online enabled games [Member]
Deferred Revenue Arrangement [Line Items]
Deferred Revenue, Current	1,380		945
Other [Member]
Deferred Revenue Arrangement [Line Items]
Deferred Revenue, Current	126		104
Noncurrent [Member]
Deferred Revenue Arrangement [Line Items]
Deferred Revenue, Noncurrent	17		8
Total [Member]
Deferred Revenue Arrangement [Line Items]
Deferred Revenue	$ 1,523		$ 1,057

[1] Derived from audited Consolidated Financial Statements.