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Debt and Other Commitments (Tables)
6 Months Ended
Jul. 01, 2018
Debt Disclosure [Abstract]  
Convertible Debt
Debt obligations consisted of the following (dollars in millions):
 
July 1,
2018
 
December 31,
2017
Principal amount of 2019 Notes outstanding
$
633

 
$
633

Principal amount of 2021 Notes outstanding
517

 
517

Unamortized discount of liability component of convertible senior notes
(60
)
 
(75
)
Net carrying amount of liability component of convertible senior notes
1,090

 
1,075

Obligations under financing leases
254

 
113

Other
4

 
4

Less: current portion
(625
)
 
(10
)
Long-term debt
$
723

 
$
1,182

Carrying value of equity component of convertible senior notes, net of debt issuance cost
$
161

 
$
161

Fair value of convertible senior notes outstanding (Level 2)
$
1,427

 
$
1,305

Weighted-average remaining amortization period of discount on the liability component of convertible senior notes
2.4 years

 
2.8 years