Earnings Per Share (Details) (USD $) In Millions, except Share data	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Earnings Per Share
Net income from continuing operations	$ 80		$ 21		$ 237		$ 125
Net (loss) income from discontinued operations			(4)		1		(126)
Net Income (Loss)	$ 80		$ 17		$ 238		$ (1)
Average shares outstanding	226,000,000		224,000,000		226,000,000		223,000,000
Adjustment to shares outstanding
Weighted Average Shares Outstanding for Computation of Basic Earnings Per Share of Common Stock	226,000,000		224,000,000		226,000,000		223,000,000
Net effect of potentially dilutive shares		[1]		[1]		[2]		[2]
Weighted Average Shares Outstanding for Computation of Diluted Earnings Per Share of Common Stock	226,000,000		224,000,000		226,000,000		223,000,000
Basic and diluted earnings per share of common stock from continuing operations	$ 0.35		$ 0.09		$ 1.05		$ 0.56
Basic and diluted earnings per share of common stock from discontinued operations			$ (0.01)				$ (0.56)
Basic and diluted earnings per share	$ 0.35		$ 0.08		$ 1.05
Anti-dilutive shares	119,766		280,266		119,766		280,266

[1] The number of options to purchase shares of common stock that were excluded from the calculation of diluted EPS because they were anti-dilutive was 119,766 and 280,266 for the three months ended September 30, 2011 and 2010, respectively.

[2] The number of options to purchase shares of common stock that were excluded from the calculation of diluted EPS as they are considered to be anti-dilutive was 119,766 and 280,266 for the nine months ended September 30, 2011 and 2010, respectively.