|**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, 2024 and March 31, 2024 (in millions):As of December 31, 2024As of March 31, 2024Cost orAmortizedCostGross UnrealizedFairValueCost orAmortizedCostGross UnrealizedFairValueGainsLossesGainsLossesCorporate bonds$135$—$—$135$130$—$—$130U.S. Treasury securities99——9995——95U.S. agency securities3——39——9Commercial paper73——7366——66Foreign government securities8——88——8Asset-backed securities46——4641——41Certificates of deposit15——1513——13Short-term investments$379$—$—$379$362$—$—$362
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|                                                                      | As of December 31, 2024                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|                                                                      | Cost orAmortizedCost                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|                                                                      | Gains                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|Corporate bonds                                                       | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|U.S. Treasury securities                                              | 99                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|U.S. agency securities                                                | 3                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Commercial paper                                                      | 73                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Foreign government securities                                         | 8                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Asset-backed securities                                               | 46                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Certificates of deposit                                               | 15                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|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, 2024 and March 31, 2024 (in millions):As of December 31, 2024As of March 31, 2024AmortizedCostFairValueAmortizedCostFairValueShort-term investmentsDue within 1 year$258$258$231$231Due 1 year through 5 years118118126126Due after 5 years3355Short-term investments$379$379$362$362                                                                                                                              
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|                                                                      | As of December 31, 2024                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|                                                                      | AmortizedCost                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Short-term investments                                                |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Due within 1 year                                                     | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Due 1 year through 5 years                                            | 118                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|Due after 5 years                                                     | 3                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Short-term investments                                                | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   

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