Debt (Tables)

12 Months Ended

Dec. 31, 2014

Debt Disclosure [Abstract]

Schedule of total debt

Total debt as of December 31 consisted of the following:

(millions)	2014		2013
5.875% senior notes due 2021	$	350	$	350
6.3% senior notes due 2016	500		500
7.75% senior notes due 2018	500		500
7.875% senior notes due 2020 (net of discount: 2014 - $1; 2013 - $1)	249		249
8.375% senior notes due 2018	350		350
9.75% senior notes due 2014	—		59
10% convertible senior notes due 2018 (net of discount: 2013 - $3)	—		72
Ship mortgage facility (includes current portion of long-term debt: 2014 - $4; 2013 - $4)	21		25
Credit facilities of Oman joint ventures	—		11
Industrial revenue bonds (due 2028 through 2034)	239		239
Total	$	2,209	$	2,355

Amounts of total debt outstanding maturing in each of next five years and beyond

As of December 31, 2014, the amounts of total debt outstanding maturing in each of the next five years and beyond were as follows:

(millions)	2015		2016		2017		2018		2019		After 2019
Debt maturities	$	6	$	507	$	8	$	850	$	—	$	839