(Fair Value Of Short-Term Investments) (Details) - USD ($) $ in Millions	12 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Financial Instruments [Line Items]
Short-term investments, Fair Value	$ 1,106	$ 1,967
Short-Term Investments [Member]
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	1,105	1,970
Gross Unrealized Gains	1	5
Gross Unrealized Losses	0	(8)
Short-term investments, Fair Value	1,106	1,967
Short-Term Investments [Member] \| Corporate Bonds [Member]
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	372	684
Gross Unrealized Gains	0	1
Gross Unrealized Losses	0	(4)
Short-term investments, Fair Value	372	681
Short-Term Investments [Member] \| U.S. Treasury Securities [Member]
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	374	530
Gross Unrealized Gains	1	4
Gross Unrealized Losses	0	0
Short-term investments, Fair Value	375	534
Short-Term Investments [Member] \| U.S. Agency Securities [Member]
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	3	8
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Short-term investments, Fair Value	3	8
Short-Term Investments [Member] \| Commercial Paper [Member]
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	136	377
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Short-term investments, Fair Value	136	377
Short-Term Investments [Member] \| Debt Security, Government, Non-US [Member]
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	67	42
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Short-term investments, Fair Value	67	42
Short-Term Investments [Member] \| Asset-backed Securities [Member]
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	112	273
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(4)
Short-term investments, Fair Value	112	269
Short-Term Investments [Member] \| Certificates of Deposit [Member]
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	41	56
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Short-term investments, Fair Value	$ 41	$ 56

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.

+ 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)
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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=123581744&loc=d3e27161-111563

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