(Fair Value Of Short-Term Investments) (Details) - USD ($) $ in Millions	12 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Financial Instruments [Line Items]
Fair Value	$ 1,073	$ 1,967
Short-Term Investments [Member]
Financial Instruments [Line Items]
Cost or Amortized Cost	1,082	1,970
Gross Unrealized Gains		0
Gross Unrealized Losses	(9)	(3)
Fair Value	1,073	1,967
Short-Term Investments [Member] \| Corporate Bonds [Member]
Financial Instruments [Line Items]
Cost or Amortized Cost	629	944
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(5)	(1)
Fair Value	624	943
Short-Term Investments [Member] \| U.S. Treasury Securities [Member]
Financial Instruments [Line Items]
Cost or Amortized Cost	212	414
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2)	(1)
Fair Value	210	413
Short-Term Investments [Member] \| U.S. Agency Securities [Member]
Financial Instruments [Line Items]
Cost or Amortized Cost	79	152
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1)	(1)
Fair Value	78	151
Short-Term Investments [Member] \| Commercial Paper [Member]
Financial Instruments [Line Items]
Cost or Amortized Cost	109	212
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	109	212
Short-Term Investments [Member] \| Foreign Government Debt Securities [Member]
Financial Instruments [Line Items]
Cost or Amortized Cost	53	113
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1)	0
Fair Value	52	113
Short-Term Investments [Member] \| Asset-backed Securities [Member]
Financial Instruments [Line Items]
Cost or Amortized Cost	0	135
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 0	$ 135

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

+ Details

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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=75030427&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=82896770&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=82897076&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=82897076&loc=d3e27161-111563

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