| **Goodwill And Acquisition-Related Intangibles, Net - Schedule Of Acquisition-Related Intangibles (Details) - USD ($) $ in Millions** | Sep. 30, 2024 | Mar. 31, 2024 |
|---------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Finite-Lived Intangible Assets**                                                                                                    |          |          |
| Gross Carrying Amount                                                                                                                 | $ 1,583       | $ 1,583       |
| Accumulated Amortization                                                                                                              | (1,237)       | (1,183)       |
| Acquisition- Related Intangibles, Net                                                                                            | 346           | 400           |
| Developed and core technology                                                                                                         |          |          |
| **Finite-Lived Intangible Assets**                                                                                                    |          |          |
| Gross Carrying Amount                                                                                                                 | 1,025         | 1,025         |
| Accumulated Amortization                                                                                                              | (852)         | (821)         |
| Acquisition- Related Intangibles, Net                                                                                            | 173           | 204           |
| Trade names and trademarks                                                                                                            |          |          |
| **Finite-Lived Intangible Assets**                                                                                                    |          |          |
| Gross Carrying Amount                                                                                                                 | 502           | 502           |
| Accumulated Amortization                                                                                                              | (329)         | (306)         |
| Acquisition- Related Intangibles, Net                                                                                            | 173           | 196           |
| Registered user base and other intangibles                                                                                            |          |          |
| **Finite-Lived Intangible Assets**                                                                                                    |          |          |
| Gross Carrying Amount                                                                                                                 | 56            | 56            |
| Accumulated Amortization                                                                                                              | (56)          | (56)          |
| Acquisition- Related Intangibles, Net                                                                                            | $ 0           | $ 0           |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.
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| - Definition
Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
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| - Definition
Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.
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