Earnings (Loss) Per Share (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Reconciliation of basic earnings (loss) per share to diluted earnings (loss) per share
Net Earning (Loss) (Basic and Diluted)	$ (100)	$ (115)	$ (70)	$ (105)	$ (121)	$ (100)	$ (74)	$ (110)	$ (390)	$ (405)	$ (787)
Shares, Basic									103,902	100,472	99,238
Shares, Diluted									103,902	100,472	99,238
Weighted Average Per-Share Amount, Basic	$ (0.95)	$ (1.09)	$ (0.69)	$ (1.01)	$ (1.17)	$ (1.00)	$ (0.74)	$ (1.10)	$ (3.76)	$ (4.03)	$ (7.93)
Weighted Average Per-Share Amount, Diluted	$ (0.95)	$ (1.09)	$ (0.69)	$ (1.01)	$ (1.17)	$ (1.00)	$ (0.74)	$ (1.10)	$ (3.76)	$ (4.03)	$ (7.93)