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Debt (Tables)
6 Months Ended
Jun. 30, 2014
Debt Disclosure [Abstract]  
Schedule of long-term debt instruments
Total debt, including the current portion of long-term debt, consisted of the following:
(millions)
June 30,
2014
 
December 31,
2013
5.875% senior notes due 2021
$
350

 
$
350

6.3% senior notes due 2016
500

 
500

7.75% senior notes due 2018, net of discount
500

 
500

7.875% senior notes due 2020, net of discount
249

 
249

8.375% senior notes due 2018
350

 
350

9.75% senior notes due 2014, net of discount
59

 
59

10% convertible senior notes due 2018, net of discount

 
72

Ship mortgage facility (includes $4 million of current portion of long-term debt)
23

 
25

Credit facilities of Oman joint ventures

 
11

Industrial revenue bonds (due 2028 through 2034)
239

 
239

Total
$
2,270

 
$
2,355