Earnings Per Share (Schedule Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Line Items]
Net loss	$ (708)	$ (1,739)	$ (2,433)	$ (2,449)
Mandatory convertible preferred stock dividend	27	27	81	79
Net Loss Attributable to Common Stock	$ (735)	$ (1,766)	$ (2,514)	$ (2,528)
Number of common shares: Weighted average outstanding	482,485,150	382,098,080	417,222,661	379,909,748
Number of common shares: Issued upon assumed exercise of outstanding stock options
Number of common shares: Effect of issuance of non-vested restricted common stock
Number of common shares: Effect of issuance of non-vested performance units
Number of common shares: Effect of issuance of mandatory convertible preferred stock
Number of common shares: Effect of declaration of preferred stock dividends
Number of common shares: Weighted average and potential dilutive outstanding	482,485,150	382,098,080	417,222,661	379,909,748
Basic	$ (1.52)	$ (4.62)	$ (6.02)	$ (6.65)
Diluted	$ (1.52)	$ (4.62)	$ (6.02)	$ (6.65)
Common stock, shares declared as stock dividend	2,043,780		2,043,780
Stock Options [Member]
Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares	3,409,596	3,796,778	3,714,095	3,778,140
Restricted Stock [Member]
Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares	599,372	1,469,380	993,576	1,472,379
Performance Units [Member]
Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares	935,330	89,802	762,171	135,836
Mandatory Convertible Preferred Stock [Member]
Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares	74,999,895	74,999,895	74,999,895	69,505,397