Equity And Earnings Per Share (Schedule Of Basic And Diluted Earnings Per Share) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Equity And Earnings Per Share [Abstract]
Net income from continuing operations	$ 68		$ 62
Net income from discontinued operations			2
Net Income	$ 68		$ 64
Average shares outstanding	228,000,000		225,000,000
Adjustment to shares outstanding
Weighted Average Shares Outstanding for Computation of Basic Earnings Per Share of Common Stock	228,000,000		225,000,000
Net effect of potentially dilutive shares		[1]		[1]
Weighted Average Shares Outstanding for Computation of Diluted Earnings Per Share of Common Stock	228,000,000		225,000,000
Earnings per share of common stock from continuing operations	$ 0.30		$ 0.27
Earnings per share of common stock from discontinued operations			$ 0.01
Basic and diluted earnings per share	$ 0.30		$ 0.28
Number of options excluded from diluted EPS calculation	3,000		133,066

[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 3,000 and 133,066 for the three months ended March 31, 2012 and 2011, respectively.