Earnings Per Share (Schedule Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
	Mar. 16, 2016	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Line Items]
Net income (loss)		$ (1,132)	$ 78
Mandatory convertible preferred stock dividend		27	25
Net income (loss) attributable to shareholders		$ (1,159)	53
Participating securities - mandatory convertible preferred stock			7
Net Income (Loss) Attributable to Common Stock		$ (1,159)	$ 46
Number of common shares, Weighted average outstanding		382,870,847	375,444,030
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			133,634
Number of common shares: Effect of issuance of non-vested performance units			390
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		382,870,847	375,578,054
Basic		$ (3.03)	$ 0.12
Diluted		$ (3.03)	$ 0.12
Common stock, shares declared as stock dividend	3,024,737	3,024,737
Stock Options [Member]
Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares		5,732,521	3,704,089
Restricted Stock [Member]
Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares		5,779,820	1,916,645
Performance Units [Member]
Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares		297,297
Mandatory Convertible Preferred Stock [Member]
Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares		74,999,895	58,333,252