Royalties And Licenses (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
Jun. 30, 2015	Jun. 30, 2014
Royalties And Licenses
Royalty Related Loss and Or Impairment Charges		$ 122
Expected accretion expense through March 2022	$ 27
Unrecorded Unconditional Purchase Obligation	2,122
Developer/Licensor Commitments
Royalties And Licenses
Unrecorded Unconditional Purchase Obligation	$ 1,542

Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 440

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308

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