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Debt (Tables)
 9 Months Ended
Sep. 27, 2020
Debt Disclosure [Abstract]  
Summary of Debt Obligations
In millionsSeptember 27,
2020		December 29,
2019
Principal amount of 2023 Notes outstanding$750 $750 
Principal amount of 2021 Notes outstanding517 517 
Unamortized discount of liability component of convertible senior notes(94)(126)
Net carrying amount of liability component of convertible senior notes1,173 1,141 
Less: current portion(507)— 
Long-term debt
$666 $1,141 
Carrying value of equity component of convertible senior notes, net of debt issuance costs$213 $213 
Fair value of convertible senior notes outstanding (Level 2)$1,447 $1,549 
Weighted-average remaining amortization period of discount on the liability component of convertible senior notes2.6 years3.2 years