| **Financial Instruments (Fair Value Of Short-Term Investments By Stated Maturity Date Schedule) (Details) - USD ($) $ in Millions** | Sep. 30, 2022 | Mar. 31, 2022 |
|-------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Financial Instruments**                                                                                                           |          |          |  |
| Short-term investments, Fair Value                                                                                                  | $ 335         | $ 330         | [1] |
| Short-term investments                                                                                                              |          |          |  |
| **Financial Instruments**                                                                                                           |          |          |  |
| Due in 1 year or less, Amortized Cost                                                                                               | 264           | 250           |  |
| Due in 1 year or less, Fair Value                                                                                                   | 262           | 249           |  |
| Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost     | 69            | 77            |  |
| Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value         | 68            | 76            |  |
| Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost     | 5             | 5             |  |
| Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value         | 5             | 5             |  |
| Short-term investments, Amortized Cost                                                                                              | 338           | 332           |  |
| Short-term investments, Fair Value                                                                                                  | $ 335         | $ 330         |  |
|                                                                                                                                     |
| [1]Derived from audited Consolidated Financial Statements.                                                                          |

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Financial Instruments [Line Items]
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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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