|**Financial Instruments (Tables)**                                    | 3 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
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|**Financial Instruments [Abstract]**                                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Fair Value Of Short-Term Investments                                  | Short-term investments consisted of the following as of June 30, 2022 and March 31, 2022 (in millions):As of June 30, 2022As of March 31, 2022Cost orAmortizedCostGross UnrealizedFairValueCost orAmortizedCostGross UnrealizedFairValueGainsLossesGainsLossesCorporate bonds$133$—$(1)$132$117$—$(1)$116U.S. Treasury securities101—(1)100103—(1)102U.S. agency securities3——3————Commercial paper28——2839——39Foreign government securities18——1817——17Asset-backed securities38—(1)3738——38Certificates of deposit16——1618——18Short-term investments$337$—$(3)$334$332$—$(2)$330
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|                                                                      | As of June 30, 2022                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|                                                                      | Cost orAmortizedCost                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|                                                                      | Gains                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Corporate bonds                                                       | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|U.S. Treasury securities                                              | 101                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|U.S. agency securities                                                | 3                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|Commercial paper                                                      | 28                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Foreign government securities                                         | 18                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Asset-backed securities                                               | 38                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Certificates of deposit                                               | 16                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|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 June 30, 2022 and March 31, 2022 (in millions):As of June 30, 2022As of March 31, 2022AmortizedCostFairValueAmortizedCostFairValueShort-term investmentsDue within 1 year$262$260$250$249Due 1 year through 5 years71707776Due after 5 years4455Short-term investments$337$334$332$330                                                                                                                                                        
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|                                                                      | As of June 30, 2022                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|                                                                      | AmortizedCost                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Short-term investments                                                |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Due within 1 year                                                     | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|Due 1 year through 5 years                                            | 71                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Due after 5 years                                                     | 4                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|Short-term investments                                                | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 

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