Debt (Tables)

6 Months Ended

Jun. 30, 2011

Debt [Abstract]

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

	As of		As of
	June 30,		December 31,
(millions)	2011		2010
6.3% senior notes due 2016	$	500	$	500
7.75% senior notes due 2018, net of discount		499		499
8.375% senior notes due 2018		350		350
9.75% senior notes due 2014, net of discount		296		296
10% convertible senior notes due 2018, net of discount		382		382
Ship mortgage facility (includes $7 million of current portion of long-term debt)		40		42
Industrial revenue bonds (due 2028 through 2034)		239		239
Total	$	2,306	$	2,308