Earnings Per Share (Schedule Of Basic And Diluted 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 [Abstract]
Stock options outstanding, antidilutive	3,783,574		4,246,007		3,804,671		5,369,606
Net income (loss)	$ 444		$ (213)		$ (693)		$ (398)
Basic weighted-average shares	195,612,615	[1]	200,529,483	[1]	198,262,715	[1]	203,239,935	[1]
Effect of common stock equivalents: Stock options	734,887
Diluted weighted-average shares	196,347,502		200,529,483		198,262,715		203,239,935
Basic EPS: Net income (loss)	$ 2.27		$ (1.06)		$ (3.50)		$ (1.96)
Diluted EPS: Net income (loss)	$ 2.26		$ (1.06)		$ (3.50)		$ (1.96)
Unvested restricted stock and units that receive nonforfeitable dividends or dividend equivalents	5,038,788		5,288,205		5,085,256		5,364,012

[1] Includes 5,038,788 and 5,288,205 of unvested restricted stock and units that receive nonforfeitable dividends or dividend equivalents for the three months ended September 30, 2011 and 2010, respectively. Includes 5,085,256 and 5,364,012 of unvested restricted stock and units that receive nonforfeitable dividends or dividend equivalents for the nine months ended September 30, 2011 and 2010, respectively.