Royalties And Licenses (Narrative) (Details) $ in Millions	3 Months Ended	9 Months Ended
Dec. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Royalties And Licenses
Royalty-Based Asset Impairment Charge and Loss On Previously Minimum Unrecognized Royalty-Based Commitment	$ 22	$ 22
Unrecorded Unconditional Purchase Obligation	2,414	2,414
Developer/Licensor Commitments - Royalty Bearing Only
Royalties And Licenses
Unrecorded Unconditional Purchase Obligation	1,338	1,338
Research And Development [Member]
Royalties And Licenses
Royalty-Based Asset Impairment Charge	12	12
Cost of service revenue [Member]
Royalties And Licenses
Loss On Previously Unrecognized Minimum Royalty-Based Commitment	$ 10	$ 10

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
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+ References

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

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