Financial Instruments - Fair Value Of Short-Term Investments (Details) - USD ($) $ in Millions	Mar. 31, 2025	Mar. 31, 2024
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	$ 112	$ 362
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Short-term investments, Fair Value	112	362
Corporate bonds
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	46	130
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Short-term investments, Fair Value	46	130
U.S. Treasury securities
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	12	95
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Short-term investments, Fair Value	12	95
U.S. Agency Securities [Member]
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	0	9
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Short-term investments, Fair Value	0	9
Commercial paper
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	0	66
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Short-term investments, Fair Value	0	66
Foreign government securities
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	4	8
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Short-term investments, Fair Value	4	8
Asset-backed securities
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	50	41
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Short-term investments, Fair Value	50	41
Certificates of deposit
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	0	13
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Short-term investments, Fair Value	$ 0	$ 13

Financial Instruments [Line Items]

No definition available.

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- Definition

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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- Definition

Amount, before tax, of unrealized loss 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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- Definition

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

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

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