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Debt (Tables)
9 Months Ended
Sep. 30, 2016
Debt Disclosure [Abstract]  
Schedule of long-term debt instruments
Total debt, including the current portion of long-term debt, consisted of the following:
(millions)
September 30,
2016
 
December 31,
2015
5.5% senior notes due 2025
$
350

 
$
350

5.875% senior notes due 2021
350

 
350

6.3% senior notes due 2016
300

 
500

7.75% senior notes due 2018
500

 
500

7.875% senior notes due 2020, net of discount
249

 
249

Industrial revenue bonds (due 2028 through 2034)
239

 
239

Total
$
1,988

 
$
2,188

Less: Unamortized debt issuance costs
11

 
13

Total
$
1,977

 
$
2,175