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Stock-Based Compensation
 6 Months Ended
Jul. 26, 2020
Share-based Payment Arrangement [Abstract]  
Stock-Based Compensation Stock-Based Compensation
Our stock-based compensation expense is associated with restricted stock units, or RSUs, performance stock units that are based on our corporate financial performance targets, or PSUs, performance stock units that are based on market conditions, or market-based PSUs, and our employee stock purchase plan, or ESPP.
Our Condensed Consolidated Statements of Income include stock-based compensation expense, net of amounts allocated to inventory, as follows:
 Three Months EndedSix Months Ended
 July 26,
2020		July 28,
2019		July 26,
2020		July 28,
2019
(In millions)
Cost of revenue$14 $8 $35 $12 
Research and development228 145 362 259 
Sales, general and administrative132 71 201 130 
Total$374 $224 $598 $401 
Equity Award Activity
The following is a summary of equity award transactions under our equity incentive plans:
RSUs, PSUs, and Market-based PSUs Outstanding
 Number of SharesWeighted Average Grant-Date Fair Value Per Share
(In millions, except per share data)
Balances, January 26, 202014 $176.72 
Granted8 $291.89 
Vested restricted stock(5)$149.90 
Balances, July 26, 202017 $239.22 

As of July 26, 2020, there was $3.60 billion of aggregate unearned stock-based compensation expense, net of forfeitures. This amount is expected to be recognized over a weighted average period of 2.8 years for RSUs, PSUs, and market-based PSUs, and 0.9 years for ESPP.