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Long-Term Debt (Tables)
 6 Months Ended
Jun. 30, 2019
Debt Disclosure [Abstract]  
Schedule of Long-Term Debt
At June 30, 2019 and December 31, 2018, the Company’s consolidated long-term debt balance comprised of the following ($ in millions):
 
June 30,
2019
 
December 31, 2018
IMTT
$
1,109

 
$
1,109

Atlantic Aviation
1,022

 
1,025

MIC Hawaii
195

 
196

MIC Corporate
736

 
734

Total
3,062

 
3,064

Current portion
(364
)
 
(361
)
Long-term portion
2,698

 
2,703

Unamortized deferred financing costs(1)
(45
)
 
(50
)
Long-term portion less unamortized debt discount and deferred financing costs
$
2,653

 
$
2,653

___________
(1)
The weighted average remaining life of the deferred financing costs at June 30, 2019 was approximately 6 years.
Convertible Debt
The 2.00% Convertible Senior Notes due October 2023 consisted of the following ($ in millions):
 
June 30,
2019
 
December 31, 2018
Liability Component:
 
 
 
Principal
$
403

 
$
403

Unamortized debt discount
(17
)
 
(19
)
Long-term debt, net of unamortized debt discount
386

 
384

Unamortized deferred financing costs
(7
)
 
(7
)
Net carrying amount
$
379

 
$
377

Equity Component
$
27

 
$
27