Equity And Earnings Per Share (Schedule Of Basic And Diluted Earnings Per Share) (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Mar. 31, 2012	Jun. 30, 2011	Jun. 30, 2012		Jun. 30, 2011
Net income from continuing operations	$ 62			$ 95	$ 130		$ 157
Net income (Loss) from discontinued operations	0			(1)	0		1
Net Income	$ 62		$ 68	$ 94	$ 130		$ 158
Weighted average shares outstanding for basic computation:
Average shares outstanding	228,000,000			226,000,000	228,000,000		226,000,000
Adjustment to shares outstanding
Weighted Average Shares Outstanding for Computation of Basic Earnings per Share of Common Stock	228,000,000			226,000,000	228,000,000		226,000,000
Net effect of potentially dilutive shares	1,000,000	[1]			1,000,000	[2]
Weighted Average Shares Outstanding for Computation of Diluted Earnings Per Share of Common Stock	229,000,000			226,000,000	229,000,000		226,000,000
Basic and Diluted Earnings per Share	$ 0.27			$ 0.42	$ 0.57		$ 0.70
Earnings per share of common stock from continuing operations	$ 0.27			$ 0.42	$ 0.57		$ 0.69
Earnings per share of common stock from discontinued operations							$ 0.01
Number of options excluded from diluted EPS calculation	0			14,900	0		119,766

[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 zero and 14,900 for the three months ended June 30, 2012 and 2011, respectively.

[2] 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 zero and 119,766 for the six months ended June 30, 2012 and 2011, respectively.