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Common Stock and Employee Equity Plans (Tables)
 9 Months Ended
Sep. 26, 2020
Equity [Abstract]  
Schedule of Common Shares Outstanding
Shares of common stock outstanding were as follows:
Three Months EndedNine Months Ended
September 26,
2020		September 28,
2019		September 26,
2020		September 28,
2019
(In millions)
Balance, beginning of period1,174 1,086 1,170 1,005 
Common stock issued under employee equity plans9 12 13 17 
Common stock repurchases for tax withholding on equity awards(1)— (1)— 
Issuance of common stock upon warrant exercise— — — 75 
Issuance of common stock to settle convertible debt20 16 20 16 
Issuance of treasury stock to partially settle debt— — — 1 
Balance, end of period1,202 1,114 1,202 1,114 
Share-based Payment Arrangement, Expensed and Capitalized, Amount
Stock-based compensation expense was as follows: 
Three Months EndedNine Months Ended
September 26,
2020		September 28,
2019		September 26,
2020		September 28,
2019
(In millions)
Cost of sales$1 $2 $5 $5 
Research and development48 37 122 92 
Marketing, general and administrative27 15 68 43 
Total$76 $54 $195 $140