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Debt (Tables)
 12 Months Ended
Dec. 31, 2018
Debt Disclosure [Abstract]  
Maturities of long-term debt
As of December 31, 2018, contractual maturities of debt for the years ending December 31 were as follows. All amounts represent the principal amounts of the debt instruments outstanding.
 
Total
 
2019
 
2020
 
2021
 
2022
 
2023
 
Thereafter
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(In millions)
5.375% Notes
$
700

 
$
—

 
$
—

 
$
—

 
$
700

 
$
—

 
$
—

4.875% Notes
330

 
—

 
—

 
—

 
—

 
—

 
330

1.125% Convertible Notes
252

 
—

 
252

 
—

 
—

 
—

 
—

 
$
1,282

 
$
—

 
$
252

 
$
—

 
$
700

 
$
—

 
$
330
Long term debt
The following table summarizes our outstanding debt obligations and their classification in the accompanying consolidated balance sheets:
 
December 31,
 
2018
 
2017
 
(In millions)
Current portion of long-term debt:
 
 
 
1.125% Convertible Notes, net of unamortized discount
$
241

 
$
499

1.625% Convertible Notes, net of unamortized discount
—

 
157

Lease financing obligations
1

 
1

Debt issuance costs
(1
)
 
(4
)
 
241

 
653

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

 
700

4.875% Notes
330

 
330

Credit Facility
—

 
300

Debt issuance costs
(10
)
 
(12
)
 
1,020

 
1,318

Lease financing obligations
197

 
198

 
$
1,458

 
$
2,169
Debt instruments interest cost recognized
Interest cost recognized relating to our convertible senior notes, the 1.125% Convertible Notes and the 1.625% Convertible Notes, was as follows:
 
Years Ended December 31,
 
2018
 
2017
 
2016
 
(In millions)
Contractual interest at coupon rate
$
6

 
$
11

 
$
11

Amortization of the discount
21

 
32

 
30

 
$
27

 
$
43

 
$
41