Earnings Per Share (Schedule Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income (loss)	$ (1,739)	$ 211	$ (2,449)	$ 612
Mandatory convertible preferred stock dividend	27		79
Net Income (Loss) Attributable to Common Stock	$ (1,766)	$ 211	$ (2,528)	$ 612
Number of common shares, Weighted average outstanding	382,098,080	351,457,043	379,909,748	351,357,913
Number of common shares: Issued upon assumed exercise of outstanding stock options		235,944		354,940
Number of common shares: Effect of issuance of non-vested restricted common stock		514,668		484,786
Number of common shares: Effect of issuance of non-vested performance units		119,595		136,907
Number of common shares: Effect of issuance of mandatory convertible preferred stock
Number of common shares, Weighted average and potential dilutive outstanding	382,098,080	352,327,250	379,909,748	352,334,546
Basic	$ (4.62)	$ 0.60	$ (6.65)	$ 1.74
Diluted	$ (4.62)	$ 0.60	$ (6.65)	$ 1.74
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares	3,796,778	1,254,842	3,778,140	1,111,128
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares	1,469,380	27,916	1,472,379	24,215
Performance Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares	89,802		135,836
Mandatory Convertible Preferred Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares	74,999,895		69,505,397