(Schedule Of Royalty-Related Liabilities) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Mar. 31, 2020
Royalty-Related Liabilities [Line Items]
Royalty-related liabilities	$ 210	$ 197
Accrued royalties
Royalty-Related Liabilities [Line Items]
Royalty-related liabilities	210	171
Other Liabilities [Member]
Royalty-Related Liabilities [Line Items]
Royalty-related liabilities	$ 0	$ 26

Carrying value as of the balance sheet date of obligations incurred through that date and payable for royalties.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.15(a))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.15(5))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Name:	us-gaap_AccruedRoyaltiesCurrentAndNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant