| **Financial Instruments (Fair Value Of Short-Term Investments) (Details) - USD ($) $ in Millions** | Dec. 31, 2021 | Mar. 31, 2021 |
|----------------------------------------------------------------------------------------------------|---------------|---------------|
| **Financial Instruments**                                                                          |          |          |  |
| Fair Value                                                                                         | $ 346         | $ 1,106       | [1] |
| Short-term investments                                                                             |          |          |  |
| **Financial Instruments**                                                                          |          |          |  |
| Debt Securities, Available-for-sale, Amortized Cost                                                | 346           | 1,105         |  |
| Gross Unrealized Gains                                                                             | 0             | 1             |  |
| Gross Unrealized Losses                                                                            | 0             | 0             |  |
| Fair Value                                                                                         | 346           | 1,106         |  |
| Short-term investments | Corporate bonds                                                           |          |          |  |
| **Financial Instruments**                                                                          |          |          |  |
| Debt Securities, Available-for-sale, Amortized Cost                                                | 148           | 372           |  |
| Gross Unrealized Gains                                                                             | 0             | 0             |  |
| Gross Unrealized Losses                                                                            | 0             | 0             |  |
| Fair Value                                                                                         | 148           | 372           |  |
| Short-term investments | U.S. Treasury securities                                                  |          |          |  |
| **Financial Instruments**                                                                          |          |          |  |
| Debt Securities, Available-for-sale, Amortized Cost                                                | 75            | 374           |  |
| Gross Unrealized Gains                                                                             | 0             | 1             |  |
| Gross Unrealized Losses                                                                            | 0             | 0             |  |
| Fair Value                                                                                         | 75            | 375           |  |
| Short-term investments | U.S. agency securities                                                    |          |          |  |
| **Financial Instruments**                                                                          |          |          |  |
| Debt Securities, Available-for-sale, Amortized Cost                                                | 0             | 3             |  |
| Gross Unrealized Gains                                                                             | 0             | 0             |  |
| Gross Unrealized Losses                                                                            | 0             | 0             |  |
| Fair Value                                                                                         | 0             | 3             |  |
| Short-term investments | Commercial paper                                                          |          |          |  |
| **Financial Instruments**                                                                          |          |          |  |
| Debt Securities, Available-for-sale, Amortized Cost                                                | 39            | 136           |  |
| Gross Unrealized Gains                                                                             | 0             | 0             |  |
| Gross Unrealized Losses                                                                            | 0             | 0             |  |
| Fair Value                                                                                         | 39            | 136           |  |
| Short-term investments | Debt Security, Government, Non-US [Member]                                |          |          |  |
| **Financial Instruments**                                                                          |          |          |  |
| Debt Securities, Available-for-sale, Amortized Cost                                                | 30            | 67            |  |
| Gross Unrealized Gains                                                                             | 0             | 0             |  |
| Gross Unrealized Losses                                                                            | 0             | 0             |  |
| Fair Value                                                                                         | 30            | 67            |  |
| Short-term investments | Asset-backed Securities [Member]                                          |          |          |  |
| **Financial Instruments**                                                                          |          |          |  |
| Debt Securities, Available-for-sale, Amortized Cost                                                | 38            | 112           |  |
| Gross Unrealized Gains                                                                             | 0             | 0             |  |
| Gross Unrealized Losses                                                                            | 0             | 0             |  |
| Fair Value                                                                                         | 38            | 112           |  |
| Short-term investments | Certificates of Deposit [Member]                                          |          |          |  |
| **Financial Instruments**                                                                          |          |          |  |
| Debt Securities, Available-for-sale, Amortized Cost                                                | 16            | 41            |  |
| Gross Unrealized Gains                                                                             | 0             | 0             |  |
| Gross Unrealized Losses                                                                            | 0             | 0             |  |
| Fair Value                                                                                         | $ 16          | $ 41          |  |
|                                                                                                    |
| [1]Derived from audited Consolidated Financial Statements.                                         |

| X                                                                                                                                                                                                                                             |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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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).
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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).
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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).
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