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Debt, Secured Revolving Facility and Secured Revolving Line of Credit (Tables)
 9 Months Ended
Sep. 28, 2019
Debt Disclosure [Abstract]  
Convertible Debt The following table sets forth total interest expense recognized related to the 2.125% Notes:
 
Three Months Ended
 
Nine Months Ended
 
September 28,
2019
 
September 29,
2018
 
September 28,
2019
 
September 29,
2018
 
(In millions)
Contractual interest expense
$
4

 
$
5

 
$
12

 
$
13

Interest cost related to amortization of debt issuance costs
$
—

 
$
—

 
$
1

 
$
1

Interest cost related to amortization of the debt discount
$
6

 
$
6

 
$
18

 
$
18


The 2.125% Notes consisted of the following:
 
September 28,
2019
 
December 29,
2018
 
(In millions)
Principal amounts:
 
 
 
Principal
$
679

 
$
805

Unamortized debt discount(1)
(205
)
 
(262
)
Unamortized debt issuance costs
(8
)
 
(11
)
Net carrying amount
$
466

 
$
532

Carrying amount of the equity component, net(2)
$
258

 
$
305


(1) 
Included in the consolidated balance sheets within Long-term debt, net and amortized over the remaining life of the notes using the effective interest rate method.
(2) 
Included in the consolidated balance sheets within additional paid-in capital, net of $8 million of equity issuance costs.