| **Financial Instruments - Fair Value Of Short-Term Investments (Details) - USD ($) $ in Millions** | Jun. 30, 2024 | Mar. 31, 2024 |
|----------------------------------------------------------------------------------------------------|---------------|---------------|
| **Financial Instruments**                                                                          |          |          |  |
| Cost or Amortized Cost                                                                             | $ 366         | $ 362         |  |
| Gross Unrealized Gains                                                                             | 0             | 0             |  |
| Gross Unrealized Losses                                                                            | 0             | 0             |  |
| Fair Value                                                                                         | 366           | 362           | [1] |
| Corporate bonds                                                                                    |          |          |  |
| **Financial Instruments**                                                                          |          |          |  |
| Cost or Amortized Cost                                                                             | 137           | 130           |  |
| Gross Unrealized Gains                                                                             | 0             | 0             |  |
| Gross Unrealized Losses                                                                            | 0             | 0             |  |
| Fair Value                                                                                         | 137           | 130           |  |
| U.S. Treasury securities                                                                           |          |          |  |
| **Financial Instruments**                                                                          |          |          |  |
| Cost or Amortized Cost                                                                             | 92            | 95            |  |
| Gross Unrealized Gains                                                                             | 0             | 0             |  |
| Gross Unrealized Losses                                                                            | 0             | 0             |  |
| Fair Value                                                                                         | 92            | 95            |  |
| U.S. agency securities                                                                             |          |          |  |
| **Financial Instruments**                                                                          |          |          |  |
| Cost or Amortized Cost                                                                             | 5             | 9             |  |
| Gross Unrealized Gains                                                                             | 0             | 0             |  |
| Gross Unrealized Losses                                                                            | 0             | 0             |  |
| Fair Value                                                                                         | 5             | 9             |  |
| Commercial paper                                                                                   |          |          |  |
| **Financial Instruments**                                                                          |          |          |  |
| Cost or Amortized Cost                                                                             | 72            | 66            |  |
| Gross Unrealized Gains                                                                             | 0             | 0             |  |
| Gross Unrealized Losses                                                                            | 0             | 0             |  |
| Fair Value                                                                                         | 72            | 66            |  |
| Foreign government securities                                                                      |          |          |  |
| **Financial Instruments**                                                                          |          |          |  |
| Cost or Amortized Cost                                                                             | 5             | 8             |  |
| Gross Unrealized Gains                                                                             | 0             | 0             |  |
| Gross Unrealized Losses                                                                            | 0             | 0             |  |
| Fair Value                                                                                         | 5             | 8             |  |
| Asset-backed securities                                                                            |          |          |  |
| **Financial Instruments**                                                                          |          |          |  |
| Cost or Amortized Cost                                                                             | 39            | 41            |  |
| Gross Unrealized Gains                                                                             | 0             | 0             |  |
| Gross Unrealized Losses                                                                            | 0             | 0             |  |
| Fair Value                                                                                         | 39            | 41            |  |
| Certificates of deposit                                                                            |          |          |  |
| **Financial Instruments**                                                                          |          |          |  |
| Cost or Amortized Cost                                                                             | 16            | 13            |  |
| Gross Unrealized Gains                                                                             | 0             | 0             |  |
| Gross Unrealized Losses                                                                            | 0             | 0             |  |
| Fair Value                                                                                         | $ 16          | $ 13          |  |
|                                                                                                    |
| [1]Derived from audited Consolidated Financial Statements.                                         |

| X                                                                                                                                                                                                                                             |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Financial Instruments [Line Items]
+ References
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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).
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of 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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| X                                                                                                                                                     |
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| X                                                                                                                                                           |
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| X                                                                                                                                                           |
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