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Debt (Tables)
 12 Months Ended
Dec. 31, 2016
Debt Disclosure [Abstract]  
Maturities of long-term debt
As of December 31, 2016, contractual maturities of debt for the years ending December 31 are as follows:
 
Total
 
2017
 
2018
 
2019
 
2020
 
2021
 
Thereafter
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(In millions)
5.375% Notes
$
700

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
700

1.125% Convertible Notes
550

 
—

 
—

 
—

 
550

 
—

 
—

1.625% Convertible Notes (1)
302

 
—

 
—

 
—

 
—

 
—

 
302

 
$
1,552

 
$
—

 
$
—

 
$
—

 
$
550

 
$
—

 
$
1,002


(1)
The 1.625% Notes have a contractual maturity date in 2044; however, on contractually specified dates beginning in 2018, holders of the 1.625% Notes may require us to repurchase some or all of the 1.625% Notes, or we may redeem any or all of the 1.625% Notes.
Long term debt
The principal amounts, unamortized discount (net of premium related to the 1.625% Notes), unamortized issuance costs, and net carrying amounts of debt were as follows:
 
Principal Balance
 
Unamortized Discount
 
Unamortized Issuance Costs
 
Net Carrying Amount
 
(In millions)
December 31, 2016:
 
 
 
 
 
 
 
5.375% Notes
$
700

 
$
—

 
$
9

 
$
691

1.125% Convertible Notes
550

 
73

 
6

 
471

1.625% Convertible Notes
302

 
16

 
2

 
284

 
$
1,552

 
$
89

 
$
17

 
$
1,446

December 31, 2015:
 
 
 
 
 
 
 
5.375% Notes
$
700

 
$
—

 
$
11

 
$
689

1.125% Convertible Notes
550

 
95

 
7

 
448

1.625% Convertible Notes
302

 
25

 
4

 
273

Other
1

 
—

 
—

 
1

 
$
1,553

 
$
120

 
$
22

 
$
1,411
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,
 
2016
 
2015
 
2014
 
(In millions)
Contractual interest at coupon rate
$
11

 
$
11

 
$
13

Amortization of the discount
30

 
29

 
26

 
$
41

 
$
40

 
$
39