v3.20.4
Stock-Based Compensation - Narrative (Details)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Jan. 31, 2021
USD ($)
period
$ / shares
shares
Jan. 26, 2020
USD ($)
shares
Jan. 27, 2019
USD ($)
Mar. 01, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares may be issued under the Restated 2007 Plan (in shares) 244      
Outstanding stock options subject to exercise (in shares) 2      
Number of shares available for grant (in shares) 37 29    
Employee stock purchase plan, offering period duration 24 months      
Employee stock purchase plan, number of purchase periods in offering period | period 4      
Employee stock purchase plan, purchase period duration 6 months      
Exercisable options, total intrinsic value | $ $ 1,200      
Outstanding options, total intrinsic value | $ $ 1,200      
Exercisable options, average exercise price (in dollars per share) | $ / shares $ 14.40      
Outstanding options, average exercise price (in dollars per share) | $ / shares $ 14.40      
Exercisable options, average remaining term 1 year 8 months 12 days      
Outstanding options, average remaining term 1 year 8 months 12 days      
Total intrinsic value of options exercised during the period | $ $ 521 $ 84 $ 180  
RSUs, PSUs and Market-based PSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for grant (in shares) 37      
Total fair value of units as of respective vesting dates | $ $ 2,670 $ 1,450 $ 2,620  
Restricted Stock Units and Performance Shares | Tranche One        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 4 years      
Vesting rights (as percent) 25.00%      
Quarterly vesting schedule - RSUs and PSUs (as percent) 6.25%      
Restricted Stock Units and Performance Shares | Tranche Two        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 3 years      
Vesting rights (as percent) 40.00%      
Quarterly vesting schedule - RSUs and PSUs (as percent) 7.50%      
Market-based PSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 3 years      
Maximum issuable shares of Market-based PSUs, percentage (as percent) 100.00%      
Employee Stock Purchase Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares reserved for future issuance (in shares) 60      
Maximum employee subscription rate (as percent) 10.00%      
Purchase price of ESPP (as percent) 85.00%      
Employee Stock Purchase Plan | Forecast        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum employee subscription rate (as percent)       15.00%