(Fair Value Of Short-Term Investments) (Details) - USD ($) $ in Millions	12 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Financial Instruments [Line Items]
Short-term investments, Fair Value	$ 1,967	$ 737
Short-Term Investments [Member]
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	1,970	738
Gross Unrealized Gains	5	0
Gross Unrealized Losses	(8)	(1)
Short-term investments, Fair Value	1,967	737
Short-Term Investments [Member] \| Corporate Bonds [Member]
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	684	325
Gross Unrealized Gains	1	0
Gross Unrealized Losses	(4)	(1)
Short-term investments, Fair Value	681	324
Short-Term Investments [Member] \| U.S. Treasury Securities [Member]
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	530	153
Gross Unrealized Gains	4	0
Gross Unrealized Losses	0	0
Short-term investments, Fair Value	534	153
Short-Term Investments [Member] \| U.S. Agency Securities [Member]
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	8	44
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Short-term investments, Fair Value	8	44
Short-Term Investments [Member] \| Commercial Paper [Member]
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	377	112
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Short-term investments, Fair Value	377	112
Short-Term Investments [Member] \| Debt Security, Government, Non-US [Member]
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	42	50
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Short-term investments, Fair Value	42	50
Short-Term Investments [Member] \| Asset-backed Securities [Member]
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	273	53
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(4)	0
Short-term investments, Fair Value	269	53
Short-Term Investments [Member] \| Certificates of Deposit [Member]
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	56	1
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Short-term investments, Fair Value	$ 56	$ 1

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

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.

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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)
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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)
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