|**Goodwill And Acquisition-Related Intangibles, Net (Tables)**     | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
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|**Goodwill and Intangible Assets Disclosure [Abstract]**           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Schedule Of Changes In The Carrying Amount Of Goodwill             | The changes in the carrying amount of goodwill for the nine months ended December 31, 2021 are as follows (in millions):As ofMarch 31, 2021ActivityEffects of Foreign Currency TranslationAs ofDecember 31, 2021Goodwill$3,236$2,522$(1)$5,757Accumulated impairment(368)——(368)Total$2,868$2,522$(1)$5,389                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
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|                                                                   | As ofMarch 31, 2021                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Goodwill                                                           | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Accumulated impairment                                             | (368)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Total                                                              | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Schedule Of Acquisition-Related Intangibles                        | Acquisition-related intangibles consisted of the following (in millions):As of December 31, 2021As of March 31, 2021GrossCarryingAmountAccumulatedAmortizationAcquisition-RelatedIntangibles, NetGrossCarryingAmountAccumulatedAmortizationAcquisition-RelatedIntangibles, NetFinite-lived acquisition-related intangiblesDeveloped and core technology$1,107$(597)$510$691$(472)$219Trade names and trademarks607(191)416188(144)44Registered user base and other intangibles56(20)365(5)—Carrier contracts and related85(85)—85(85)—Total finite-lived acquisition-related intangibles$1,855$(893)$962$969$(706)$263Indefinite-lived acquisition-related intangiblesIn-process research and development$90$—$90$46$—$46Total acquisition-related intangibles, net$1,945$(893)$1,052$1,015$(706)$309
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|                                                                   | As of December 31, 2021                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|                                                                   | GrossCarryingAmount                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Finite-lived acquisition-related intangibles                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Developed and core technology                                      | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Trade names and trademarks                                         | 607                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Registered user base and other intangibles                         | 56                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Carrier contracts and related                                      | 85                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Total finite-lived acquisition-related intangibles                 | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Indefinite-lived acquisition-related intangibles                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|In-process research and development                                | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Total acquisition-related intangibles, net                         | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Schedule Of Amoritization Of Intangibles                           | Amortization of intangibles for the three and nine months ended December 31, 2021 and 2020 are classified in the Condensed Consolidated Statements of Operations as follows (in millions):Three Months Ended December 31,Nine Months Ended December 31,2021202020212020Cost of revenue$44$—$88$—Operating expenses61513116Total$105$5$219$16During the three and nine months ended December 31, 2021, as part of the amortization of intangibles we recorded impairment charges of $14 million and $26 million, respectively, for acquisition-related intangible assets, which were recorded within operating expenses.                                                                                                                                                                              
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|                                                                   | Three Months Ended December 31,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|                                                                   | 2021                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|Cost of revenue                                                    | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Operating expenses                                                 | 61                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Total                                                              | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Schedule Of Future Amortization Of Acquisition-Related Intangibles | As of December 31, 2021, future amortization of finite-lived acquisition-related intangibles that will be recorded in the Condensed Consolidated Statements of Operations is estimated as follows (in millions):Fiscal Year Ending March 31,2022 (remaining three months)$75202323620241762025126202612120271012028 and thereafter127Total$962                                                                                                                                                                                                                                                                                                                                                                                                                                                       
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|Fiscal Year Ending March 31,                                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|2022 (remaining three months)                                      | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|2023                                                               | 236                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|2024                                                               | 176                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|2025                                                               | 126                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|2026                                                               | 121                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|2027                                                               | 101                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|2028 and thereafter                                                | 127                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Total                                                              | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    

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