v3.10.0.1
Debt and Secured Revolving Line of Credit (Tables)
 6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Convertible Debt
The 2.125% Notes consisted of the following:
 
June 30,
2018
 
December 30,
2017
 
(In millions)
Principal amounts:
 
 
 
Principal
$
805

 
$
805

Unamortized debt discount(1)
(274
)
 
(286
)
Unamortized debt issuance costs
(11
)
 
(12
)
Net carrying amount
$
520

 
$
507

Carrying amount of the equity component, net(2)
$
305

 
$
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 $9 million of equity issuance costs.
The following table sets forth total interest expense recognized related to the 2.125% Notes:
 
Three Months Ended
 
Six Months Ended
 
June 30,
2018
 
July 1,
2017
 
June 30,
2018
 
July 1,
2017
 
(In millions)
Contractual interest expense
$
4

 
$
5

 
$
9

 
$
9

Interest cost related to amortization of debt issuance costs
—

 
—

 
1

 
1

Interest cost related to amortization of the debt discount
$
6

 
$
5

 
$
12

 
$
11