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
Earnings Per Share [Abstract]
Antidilutive stock options outstanding	3,559,044		3,827,614
Net income (loss)	$ 10		$ (1,274)
Basic weighted average shares	193,489,424	[1]	199,972,759	[1]
Stock options	1,105,550
Diluted weighted average shares	194,594,974		199,972,759
Basic	$ 0.05		$ (6.37)
Diluted	$ 0.05		$ (6.37)
Unvested restricted stock and units that receive nonforfeitable dividends or dividend equivalents	5,219,053		5,228,926

[1] Includes 5,219,053 and 5,228,926 of unvested restricted stock and units that receive nonforfeitable dividends or dividend equivalents for the three months ended March 31, 2012 and 2011, respectively.