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Debt (Tables)
 6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Long term debt
The following table summarizes our outstanding debt obligations and their classification in the accompanying consolidated balance sheets:
 
June 30,
2018
 
December 31,
2017
 
(In millions)
Current portion of long-term debt:
 
 
 
1.125% Convertible Notes, net of unamortized discount
$
422

 
$
499

1.625% Convertible Notes, net of unamortized discount
63

 
157

Lease financing obligations
1

 
1

Debt issuance costs
(2
)
 
(4
)
 
484

 
653

Non-current portion of long-term debt:
 
 
 
5.375% Notes
700

 
700

4.875% Notes
330

 
330

Credit Facility
—

 
300

Debt issuance costs
(11
)
 
(12
)
 
1,019

 
1,318

Lease financing obligations
198

 
198

 
$
1,701

 
$
2,169
Interest Costs
Interest cost recognized relating to our convertible senior notes for the periods presented was as follows:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
 
(In millions)
Contractual interest at coupon rate
$
2

 
$
3

 
$
4

 
$
6

Amortization of the discount
6

 
8

 
13

 
16

 
$
8

 
$
11

 
$
17

 
$
22