Earnings (Loss) Per Share (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Earnings Per Share [Abstract]
Antidilutive securities excluded (in shares)	13,500,000	2,100,000	14,000,000	3,600,000
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
(Loss) income from continuing operations	$ (52)	$ 28	$ (39)	$ 8
Numerator:
Loss from discontinued operation	0	(1)	0	(1)
Net (loss) income available to common stockholders	(52)	27	(39)	7
Denominator:
Denominator for basic (loss) earnings per share—weighted-average common shares (in shares)	83,231,000	62,479,000	73,181,000	61,669,000
Denominator for diluted (loss) earnings per share—adjusted weighted-average common shares (in shares)	83,231,000	74,052,000	73,181,000	73,293,000
Basic (loss) earnings per share:
(Loss) income from continuing operations (in dollars per share)	$ (0.63)	$ 0.45	$ (0.53)	$ 0.12
Loss from discontinued operation (in dollars per share)	$ 0.00	$ (0.01)	$ 0.00	$ (0.01)
Net (loss) income (in dollars per share)	$ (0.63)	$ 0.44	$ (0.53)	$ 0.11
Diluted (loss) earnings per share:
(Loss) income from continuing operations (in dollars per share)	$ (0.63)	$ 0.38	$ (0.53)	$ 0.10
Loss from discontinued operation (in dollars per share)	$ 0.00	$ (0.01)	$ 0.00	$ (0.01)
Net (loss) income (in dollars per share)	$ (0.63)	$ 0.37	$ (0.53)	$ 0.09
Employee stock options and warrants [Member]
Denominator:
Incremental common shares attributable to share-based payment arrangements (in shares)	0	914,000	0	1,537,000
Convertible debt interest - 1 7/8 percent notes [Member]
Numerator:
Convertible debt interest - 1 7/8 percent notes	$ 0	$ 0	$ 0	$ 0
Denominator:
Convertible subordinated notes (in shares)	0	1,015,000	0	0
Convertible subordinated notes - 4 percent [Member]
Denominator:
Convertible subordinated notes (in shares)	0	9,080,000	0	9,377,000
Restricted stock units [Member]
Denominator:
Incremental common shares attributable to share-based payment arrangements (in shares)	0	564,000	0	710,000