| **Goodwill And Acquisition-Related Intangibles, Net (Schedule Of Future Amortization Of Acquisition-Related Intangibles) (Details) - USD ($) $ in Millions** | Dec. 31, 2021 | Mar. 31, 2021 |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Finite-Lived Intangible Assets**                                                                                                                           |          |          |
| Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year                                                                               | $ 75          |          |
| Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months                                                                                     | 236           |          |
| Finite-Lived Intangible Assets, Amortization Expense, Year Two                                                                                               | 176           |          |
| Finite-Lived Intangible Assets, Amortization Expense, Year Three                                                                                             | 126           |          |
| Finite-Lived Intangible Assets, Amortization Expense, Year Four                                                                                              | 121           |          |
| Finite-Lived Intangible Assets, Amortization Expense, Year Five                                                                                              | 101           |          |
| Finite-Lived Intangible Assets, Amortization Expense, after Year Five                                                                                        | 127           |          |
| Finite-Lived Intangible Assets, Net                                                                                                                          | 962           | $ 263         |
| Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year through after Year Five [Member]                                              |          |          |
| **Finite-Lived Intangible Assets**                                                                                                                           |          |          |
| Finite-Lived Intangible Assets, Net                                                                                                                          | $ 962         |          |

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in remainder of current fiscal year.
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