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Stock-Based Compensation - Allocation of Expense (Details) - USD ($)
$ in Millions
3 Months Ended
Apr. 26, 2020
Apr. 28, 2019
Share-based Compensation    
Total $ 224 $ 178
Cost of revenue    
Share-based Compensation    
Total 21 4
Research and development    
Share-based Compensation    
Total 134 114
Sales, general and administrative    
Share-based Compensation    
Total $ 69 $ 60