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Stock-Based Compensation
 3 Months Ended
Apr. 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 Ended
 April 26,
2020		April 28,
2019
(In millions)
Cost of revenue$21  $4  
Research and development134  114  
Sales, general and administrative69  60  
Total$224  $178  
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  
Granted1  $254.61  
Vested restricted stock(3) $144.27  
Canceled and forfeited(1) $161.66  
Balances, April 26, 202011  $191.23  

As of April 26, 2020, there was $1.81 billion of aggregate unearned stock-based compensation expense, net of forfeitures. This amount is expected to be recognized over a weighted average period of 2.4 years for RSUs, PSUs, and market-based PSUs, and 0.8 years for ESPP.