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