(Fair Value Of Short-Term Investments) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Mar. 31, 2021
Financial Instruments [Line Items]
Short-term investments, Fair Value	$ 330	$ 1,106
Short-Term Investments [Member]
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	332	1,105
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(2)	0
Short-term investments, Fair Value	330	1,106
Short-Term Investments [Member] \| Corporate Bonds [Member]
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	117	372
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1)	0
Short-term investments, Fair Value	116	372
Short-Term Investments [Member] \| U.S. Treasury Securities [Member]
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	103	374
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(1)	0
Short-term investments, Fair Value	102	375
Short-Term Investments [Member] \| U.S. Agency Securities [Member]
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	0	3
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Short-term investments, Fair Value	0	3
Short-Term Investments [Member] \| Commercial Paper [Member]
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	39	136
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Short-term investments, Fair Value	39	136
Short-Term Investments [Member] \| Debt Security, Government, Non-US [Member]
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	17	67
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Short-term investments, Fair Value	17	67
Short-Term Investments [Member] \| Asset-backed Securities [Member]
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	38	112
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Short-term investments, Fair Value	38	112
Short-Term Investments [Member] \| Certificates of Deposit [Member]
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	18	41
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Short-term investments, Fair Value	$ 18	$ 41

Financial Instruments [Line Items]

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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