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Financial Instruments - Fair Value Of Short-Term Investments (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Mar. 31, 2024
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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

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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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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