Condensed Consolidated Statement Of Stockholders' Equity (Deficit) (USD $) In Millions, except Share data		Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Comprehensive Income [Member]	Accumulated Other Comprehensive Income [Member]	Total
Balance, value at Dec. 31, 2010		$ 1	$ 492	$ (600)		$ 87	$ (20)
Balance, shares at Dec. 31, 2010		61,000,000					60,621,338
Comprehensive income:
Net income				72	72		72
Other comprehensive loss:
Foreign currency translation adjustments					(23)	(23)
Fixed price diesel swaps					(1)	(1)
Comprehensive income					48
Stock compensation expense, net			9
Exercise of common stock options			31
Exercise of common stock options, shares		2,000,000
4 percent Convertible Senior Notes (1)	[1]		(47)
Shares repurchased and retired			(7)
Balance, value at Sep. 30, 2011		$ 1	$ 478	$ (528)		$ 63	$ 14
Balance, shares at Sep. 30, 2011		63,000,000					62,648,356

[1] Reflects a reduction due to our 4 percent Convertible Senior Notes being convertible at September 30, 2011 (an amount equal to the unamortized portion of the original issue discount was reclassified out of stockholders' equity (deficit) and is reflected as "temporary equity" in our condensed consolidated balance sheets as of September 30, 2011), and a reduction reflecting the excess of the cash transferred upon conversion of a portion of the 4 percent Convertible Senior Notes during the nine months ended September 30, 2011 over the principal amount of the converted notes, net of cash received from the option counterparties to our convertible note hedges upon the conversion. See note 6 to our condensed consolidated financial statements for additional detail.