(Fair Value Of Short-Term Investments) (Details) - USD ($) $ in Millions	12 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Financial Instruments [Line Items]
Fair Value	$ 737	$ 1,073
Short-Term Investments [Member]
Financial Instruments [Line Items]
Cost or Amortized Cost	738	1,082
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1)	(9)
Fair Value	737	1,073
Short-Term Investments [Member] \| Corporate Bonds [Member]
Financial Instruments [Line Items]
Cost or Amortized Cost	325	629
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1)	(5)
Fair Value	324	624
Short-Term Investments [Member] \| U.S. Treasury Securities [Member]
Financial Instruments [Line Items]
Cost or Amortized Cost	153	212
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(2)
Fair Value	153	210
Short-Term Investments [Member] \| U.S. Agency Securities [Member]
Financial Instruments [Line Items]
Cost or Amortized Cost	44	79
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(1)
Fair Value	44	78
Short-Term Investments [Member] \| Commercial Paper [Member]
Financial Instruments [Line Items]
Cost or Amortized Cost	112	109
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	112	109
Short-Term Investments [Member] \| Debt Security, Government, Non-US [Member]
Financial Instruments [Line Items]
Cost or Amortized Cost	50	53
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(1)
Fair Value	50	52
Short-Term Investments [Member] \| Asset-backed Securities [Member]
Financial Instruments [Line Items]
Cost or Amortized Cost	53	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	53	0
Short-Term Investments [Member] \| Certificates of Deposit [Member]
Financial Instruments [Line Items]
Cost or Amortized Cost	1	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 1	$ 0

Financial Instruments [Line Items]

No definition available.

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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

No definition available.

+ 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

No definition available.

+ Details

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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://fasb.org/us-gaap/role/ref/legacyRef
-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://fasb.org/us-gaap/role/ref/legacyRef
-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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