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Stockholders’ Equity (Tables)
 3 Months Ended
Apr. 04, 2021
Equity [Abstract]  
Schedule of Restricted Stock Activity and Related Information, Restricted Stock
Restricted stock activity was as follows:

Restricted
Stock Units
(RSU)		Performance
Stock Units
(PSU)(1)		Weighted-Average Grant Date Fair Value per Share
Units in thousandsRSUPSU
Outstanding at January 3, 20211,721 — $313.35 — 
Awarded70 390 $445.13 $477.78 
Vested(17)— $230.58 — 
Cancelled(88)(6)$311.10 $486.28 
Outstanding at April 4, 20211,686 384 $319.77 $477.65 
______________________________________
(1)The number of units reflect the estimated number of shares to be issued at the end of the performance period. Awarded units are presented net of performance adjustments.
Schedule of Restricted Stock Activity and Related Information, Performance Units
Restricted stock activity was as follows:

Restricted
Stock Units
(RSU)		Performance
Stock Units
(PSU)(1)		Weighted-Average Grant Date Fair Value per Share
Units in thousandsRSUPSU
Outstanding at January 3, 20211,721 — $313.35 — 
Awarded70 390 $445.13 $477.78 
Vested(17)— $230.58 — 
Cancelled(88)(6)$311.10 $486.28 
Outstanding at April 4, 20211,686 384 $319.77 $477.65 
______________________________________
(1)The number of units reflect the estimated number of shares to be issued at the end of the performance period. Awarded units are presented net of performance adjustments.
Schedule of Stock Option Activity Under all Stock Option Plans
Stock option activity was as follows:

Options
(in thousands)		Weighted-Average
Exercise Price
Outstanding at January 3, 202110 $59.11 
Exercised(1)$48.36 
Outstanding and exercisable at April 4, 20219 $60.21 
Schedule of Share-based Compensation Expense for all Stock Awards
Share-based compensation expense reported in our condensed consolidated statements of income was as follows:

 In millionsQ1 2021Q1 2020
Cost of product revenue$7 $5 
Cost of service and other revenue1 1 
Research and development24 15 
Selling, general and administrative35 18 
Share-based compensation expense before taxes67 39 
Related income tax benefits(13)(9)
Share-based compensation expense, net of taxes$54 $30 
Schedule of Assumptions used to Estimate the Weighted-Average Fair Value Per Share for Stock Purchase under the Employee Stock Purchase Plan
The assumptions used for the specified reporting periods and the resulting estimates of weighted-average fair value per share for stock purchased under the ESPP during Q1 2021 were as follows:

Employee Stock Purchase Rights
Risk-free interest rate
0.08% - 1.56%
Expected volatility
30% - 48%
Expected term
0.5 - 1.0 year
Expected dividends0 %
Weighted-average grant-date fair value per share$99.67