Financial Instruments - Fair Value Of Short-Term Investments (Details) - USD ($) $ in Millions	Mar. 31, 2026	Mar. 31, 2025
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	$ 116	$ 112
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Short-term investments, Fair Value	116	112
Corporate bonds
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	52	46
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Short-term investments, Fair Value	52	46
U.S. Treasury securities
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	33	12
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Short-term investments, Fair Value	33	12
U.S. agency securities
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	2	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Short-term investments, Fair Value	2	0
Foreign government securities
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	5	4
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Short-term investments, Fair Value	5	4
Asset-backed securities
Financial Instruments [Line Items]
Short-term investments, Amortized Cost	24	50
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Short-term investments, Fair Value	$ 24	$ 50

Financial Instruments [Line Items]

No definition available.

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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).

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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).

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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).

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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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