Debt (Tables)

3 Months Ended

Mar. 31, 2012

Debt [Abstract]

Total debt, including the current portion of long-term debt

	As of		As of
	March 31,		December 31,
(millions)	2012		2011
9.75% senior notes due 2014, net of discount		$     297		$     297
8.375% senior notes due 2018		350		350
7.75% senior notes due 2018, net of discount		499		499
6.3% senior notes due 2016		500		500
10% convertible senior notes due 2018, net of discount		384		383
Ship mortgage facility (includes $7 million of current portion of long-term debt)		34		36
Industrial revenue bonds (due 2028 through 2034)		239		239
Total		$  2,303		$  2,304