Earnings Per Share (Schedule Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Net income (loss)	$ 351	$ (1,132)
Mandatory convertible preferred stock dividend	27	27
Participating securities - mandatory convertible preferred stock	43
Net Income (Loss) Attributable to Common Stock	$ 281	$ (1,159)
Number of common shares: Weighted average outstanding	493,068,000	382,870,847
Number of common shares: Issued upon assumed exercise of outstanding stock options	82,845
Number of common shares: Effect of issuance of non-vested restricted common stock	770,429
Number of common shares: Effect of issuance of non-vested performance units	573,721
Number of common shares: Effect of issuance of mandatory convertible preferred stock
Number of common shares: Weighted average and potential dilutive outstanding	494,494,995	382,870,847
Basic	$ 0.57	$ (3.03)
Diluted	$ 0.57	$ (3.03)