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Debt (Tables)
 12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]  
Maturities of long-term debt
As of December 31, 2017, 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
 
2018
 
2019
 
2020
 
2021
 
2022
 
Thereafter
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(In millions)
5.375% Notes
$
700

 
$
—

 
$
—

 
$
—

 
$
—

 
$
700

 
$
—

1.125% Convertible Notes
550

 
—

 
—

 
550

 
—

 
—

 
—

4.875% Notes
330

 
—

 
—

 
—

 
—

 
—

 
330

Credit Facility
300

 
—

 
—

 
—

 
—

 
300

 
—

1.625% Convertible Notes (1)
161

 
—

 
—

 
—

 
—

 
—

 
161

 
$
2,041

 
$
—

 
$
—

 
$
550

 
$
—

 
$
1,000

 
$
491


(1)
The 1.625% Convertible Notes have a contractual maturity date in 2044. However, on contractually specified dates beginning in 2018, holders may convert, or may require us to repurchase some or all of the 1.625% Convertible Notes.
Long term debt
The following table summarizes our outstanding debt obligations and their classification in the accompanying consolidated balance sheets (in millions):
 
December 31,
 
2017
 
2016
Current portion of long-term debt:
 
 
 
1.125% Convertible Notes, net of unamortized discount
$
499

 
$
477

1.625% Convertible Notes, net of unamortized premium and discount
157

 
—

Lease financing obligations
1

 
1

Debt issuance costs
(4
)
 
(6
)
 
653

 
472

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

 
700

4.875% Notes
330

 
—

Credit Facility
300

 
—

1.625% Convertible Notes, net of unamortized premium and discount
—

 
286

Debt issuance costs
(12
)
 
(11
)
 
1,318

 
975

Lease financing obligations
198

 
198

 
$
2,169

 
$
1,645
Debt instruments interest cost recognized
Interest cost recognized relating to our convertible senior notes for the periods presented was as follows:
 
Years Ended December 31,
 
2017
 
2016
 
2015
 
(In millions)
Contractual interest at coupon rate
$
11

 
$
11

 
$
11

Amortization of the discount
32

 
30

 
29

 
$
43

 
$
41

 
$
40