|**Goodwill (Tables)**                                              | 12 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 fiscal year ended March 31, 2022 are as follows (in millions):As ofMarch 31, 2021ActivityEffects of Foreign Currency TranslationAs ofMarch 31, 2022Goodwill$3,236$2,519$—$5,755Accumulated impairment(368)——(368)Total$2,868$2,519$—$5,387                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
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|                                                                   | As ofMarch 31, 2021                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Goodwill                                                           | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|Accumulated impairment                                             | (368)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Total                                                              | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|                                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|                                                                   | As ofMarch 31, 2020                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Goodwill                                                           | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|Accumulated impairment                                             | (368)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Total                                                              | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|Schedule Of Acquisition-Related Intangibles                        | Acquisition-related intangibles consisted of the following (in millions):As of March 31, 2022As of March 31, 2021GrossCarryingAmountAccumulatedAmortization and ImpairmentsAcquisition-RelatedIntangibles, NetGrossCarryingAmountAccumulatedAmortization and ImpairmentsAcquisition-RelatedIntangibles, NetFinite-lived acquisition-related intangiblesDeveloped and core technology$1,102$(643)$459$691$(472)$219Trade names and trademarks609(212)397188(144)44Registered user base and other intangibles56(30)265(5)—Carrier contracts and related———85(85)—Total finite-lived acquisition-related intangibles$1,767$(885)$882$969$(706)$263Indefinite-lived acquisition-related intangiblesIn-process research and development$80$—$80$46$—$46Total acquisition-related intangibles, net$1,847$(885)$962$1,015$(706)$309
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|                                                                   | As of March 31, 2022                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|                                                                   | GrossCarryingAmount                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Finite-lived acquisition-related intangibles                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Developed and core technology                                      | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|Trade names and trademarks                                         | 609                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Registered user base and other intangibles                         | 56                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Carrier contracts and related                                      | —                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|Total finite-lived acquisition-related intangibles                 | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|Indefinite-lived acquisition-related intangibles                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|In-process research and development                                | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|Total acquisition-related intangibles, net                         | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|Schedule Of Amortization Of Intangible Assets                      | Amortization of intangibles, including impairments, for the fiscal years ended March 31, 2022, 2021 and 2020 are classified in the Consolidated Statements of Operations as follows (in millions):Year Ended March 31,202220212020Cost of revenue$133$4$12Operating expenses1833022Total$316$34$34During fiscal year 2022, we recorded impairment charges of $45 million for acquisition-related intangible assets, of which $34 million was recorded within operating expenses and $11 million was recorded within cost of revenue. During fiscal year 2021 and 2020, there were no impairment charges for acquisition-related intangible assets.                                                                                                                                                                          
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|                                                                   | Year Ended March 31,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|                                                                   | 2022                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|Cost of revenue                                                    | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|                                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Operating expenses                                                 | 183                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Total                                                              | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|Schedule Of Future Amortization Of Acquisition-Related Intangibles | As of March 31, 2022, future amortization of finite-lived acquisition-related intangibles that will be recorded in the Consolidated Statements of Operations is estimated as follows (in millions):Fiscal Year Ending March 31,2023$2442024159202512620261222027102Thereafter129Total$882                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
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|Fiscal Year Ending March 31,                                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|2023                                                               | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|2024                                                               | 159                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|2025                                                               | 126                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|2026                                                               | 122                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
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|Total                                                              | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           

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