Balance Sheet Details Balance Sheet Details (Deferred Net Revenue) (Details) - USD ($) $ in Millions	12 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Deferred Revenue, Current	$ 1,527	$ 945
Deferred Revenue, Revenue Recognized	1,010	1,178
Online enabled games [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Deferred Revenue, Current	1,527	945
Other [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Deferred Revenue, Current	95	104
Noncurrent [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Deferred Revenue, Noncurrent	14	8
Total [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Deferred Revenue	$ 1,636	$ 1,057

Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(5))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable, classified as current.

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