|**Financial Instruments (Tables)**                                    | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
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|**Financial Instruments [Abstract]**                                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Fair Value Of Short-Term Investments                                  | Short-term investments consisted of the following as of December 31, 2022 and March 31, 2022 (in millions):As of December 31, 2022As of March 31, 2022Cost orAmortizedCostGross UnrealizedFairValueCost orAmortizedCostGross UnrealizedFairValueGainsLossesGainsLossesCorporate bonds$136$—$(1)$135$117$—$(1)$116U.S. Treasury securities85—(1)84103—(1)102U.S. agency securities8——8————Commercial paper50——5039——39Foreign government securities15——1517——17Asset-backed securities40——4038——38Certificates of deposit19——1918——18Short-term investments$353$—$(2)$351$332$—$(2)$330
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|                                                                      | As of December 31, 2022                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|                                                                      | Cost orAmortizedCost                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|                                                                      | Gains                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|Corporate bonds                                                       | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|U.S. Treasury securities                                              | 85                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|U.S. agency securities                                                | 8                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Commercial paper                                                      | 50                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Foreign government securities                                         | 15                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Asset-backed securities                                               | 40                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Certificates of deposit                                               | 19                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Short-term investments                                                | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Fair Value Of Short-Term Investments By Stated Maturity Date Schedule | The following table summarizes the amortized cost and fair value of our short-term investments, classified by stated maturity as of December 31, 2022 and March 31, 2022 (in millions):As of December 31, 2022As of March 31, 2022AmortizedCostFairValueAmortizedCostFairValueShort-term investmentsDue within 1 year$277$276$250$249Due 1 year through 5 years70697776Due after 5 years6655Short-term investments$353$351$332$330                                                                                                                                                    
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|                                                                      | As of December 31, 2022                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|                                                                      | AmortizedCost                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Short-term investments                                                |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Due within 1 year                                                     | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Due 1 year through 5 years                                            | 70                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Due after 5 years                                                     | 6                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Short-term investments                                                | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     

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