(Schedule Of Royalty-Related Liabilities) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Mar. 31, 2017
Royalty-Related Liabilities [Line Items]
Royalty-related liabilities	$ 245	$ 262
Accrued royalties
Royalty-Related Liabilities [Line Items]
Royalty-related liabilities	171	165
Other Liabilities [Member]
Royalty-Related Liabilities [Line Items]
Royalty-related liabilities	$ 74	$ 97

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-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=6879938&loc=d3e572229-122910

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