(Fair Value Of Short-Term Investments) (Details) - USD ($) $ in Millions	12 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Financial Instruments [Line Items]
Fair Value	$ 1,341	$ 953
Short-Term Investments [Member]
Financial Instruments [Line Items]
Cost or Amortized Cost	1,339	952
Gross Unrealized Gains	2	1
Gross Unrealized Losses	0	0
Fair Value	1,341	953
Short-Term Investments [Member] \| Corporate Bonds [Member]
Financial Instruments [Line Items]
Cost or Amortized Cost	733	467
Gross Unrealized Gains	1	0
Gross Unrealized Losses	0	0
Fair Value	734	467
Short-Term Investments [Member] \| U.S. Treasury Securities [Member]
Financial Instruments [Line Items]
Cost or Amortized Cost	389	214
Gross Unrealized Gains	1	0
Gross Unrealized Losses	0
Fair Value	390	214
Short-Term Investments [Member] \| U.S. Agency Securities [Member]
Financial Instruments [Line Items]
Cost or Amortized Cost	167	161
Gross Unrealized Gains	0	1
Gross Unrealized Losses	0	0
Fair Value	167	162
Short-Term Investments [Member] \| Commercial Paper [Member]
Financial Instruments [Line Items]
Cost or Amortized Cost	50	110
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 50	$ 110

Financial Instruments [Line Items]

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- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26626-111562

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- Definition

Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

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- Definition

Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

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