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Stock-Based Compensation
 9 Months Ended
Jan. 24, 2020
Share-based Payment Arrangement [Abstract]  
Stock-Based Compensation Stock-Based Compensation
The following table presents the components and classification of stock-based compensation expense for stock options, restricted stock, and employee stock purchase plan shares recognized for the three and nine months ended January 24, 2020 and January 25, 2019:
 Three months endedNine months ended
(in millions)January 24, 2020January 25, 2019January 24, 2020January 25, 2019
Stock options$12  $11  $52  $62  
Restricted stock46  43  159  144  
Employee stock purchase plan8  6  24  22  
Total stock-based compensation expense$66  $60  $235  $228  
Cost of products sold$6  $5  $22  $23  
Research and development expense9  8  29  29  
Selling, general, and administrative expense51  47  184  176  
Total stock-based compensation expense66  60  235  228  
Income tax benefits(11) (8) (40) (40) 
Total stock-based compensation expense, net of tax$55  $52  $195  $188