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Balance Sheet Components - Property and Equipment (Details) - USD ($)
$ in Millions
 12 Months Ended
Jan. 31, 2021
Jan. 26, 2020
Property, Plant and Equipment [Line Items]    
Total property and equipment, gross $ 3,557 $ 2,685
Accumulated depreciation and amortization (1,408) (1,011)
Property and equipment, net $ 2,149 1,674
Minimum    
Property, Plant and Equipment [Line Items]    
Estimated Useful Life 3 years  
Maximum    
Property, Plant and Equipment [Line Items]    
Estimated Useful Life 5 years  
Land    
Property, Plant and Equipment [Line Items]    
Total property and equipment, gross $ 218 218
Building    
Property, Plant and Equipment [Line Items]    
Total property and equipment, gross $ 341 340
Estimated Useful Life 30 years  
Building | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated Useful Life 25 years  
Building | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated Useful Life 30 years  
Test equipment    
Property, Plant and Equipment [Line Items]    
Total property and equipment, gross $ 782 532
Test equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated Useful Life 3 years  
Test equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated Useful Life 5 years  
Computer equipment    
Property, Plant and Equipment [Line Items]    
Total property and equipment, gross $ 1,187 908
Computer equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated Useful Life 3 years  
Computer equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated Useful Life 5 years  
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Total property and equipment, gross $ 385 293
Office furniture and equipment    
Property, Plant and Equipment [Line Items]    
Total property and equipment, gross $ 86 74
Estimated Useful Life 5 years  
Construction in process    
Property, Plant and Equipment [Line Items]    
Total property and equipment, gross $ 558 $ 320