Earnings Per Share (Schedule Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income (loss)	$ (788)	$ 207	$ (710)	$ 401
Mandatory convertible preferred stock dividend	27		52
Net Income (Loss) Attributable to Common Stock	$ (815)	$ 207	$ (762)	$ 401
Number of common shares, Weighted average outstanding	382,114,011	351,391,582	378,797,446	351,307,527
Number of common shares: Issued upon assumed exercise of outstanding stock options		490,302		418,987
Number of common shares: Effect of issuance of non-vested restricted common stock		577,599		472,008
Number of common shares: Effect of issuance of non-vested performance units		120,039		107,746
Number of common shares: Effect of issuance of mandatory convertible preferred stock
Number of common shares, Weighted average and potential dilutive outstanding	382,114,011	352,579,522	378,797,446	352,306,268
Basic	$ (2.13)	$ 0.59	$ (2.01)	$ 1.14
Diluted	$ (2.13)	$ 0.59	$ (2.01)	$ 1.14
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares	3,832,533	654,189	3,768,666	1,026,958
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares	1,507,788	19,045	1,787,257	22,952
Performance Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares	129,202		116,185
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	72,723,440		64,687,701