CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS EQUITY (DEFICIT) (USD $) In Millions, except Share data, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income [Member]
Balance at Dec. 31, 2011	$ 64	$ 1	$ 487	$ (499)	$ 75
Balance (in shares) at Dec. 31, 2011	62,877,530	63,000,000
Comprehensive income:
Net income	13			13
Other comprehensive loss:
Foreign currency translation adjustments	9				9
Fixed price diesel swaps	1				1
Comprehensive income
Stock compensation expense, net			4
Exercise of common stock options (in shares)		1,000,000
Exercise of common stock options			5
4 percent Convertible Senior Notes			2
Shares repurchased and retired			(8)
Balance at Mar. 31, 2012	$ 90	$ 1	$ 490	$ (486)	$ 85
Balance (in shares) at Mar. 31, 2012	63,771,860	64,000,000