Earnings Per Share (Schedule Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended		3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jan. 31, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Line Items]
Net loss			$ (593)	$ (788)	$ (1,725)	$ (710)
Mandatory convertible preferred stock dividend			27	27	54	52
Net Loss Attributable to Common Stock			$ (620)	$ (815)	$ (1,779)	$ (762)
Number of common shares, Weighted average outstanding			385,594,815	382,114,011	384,232,831	378,797,446
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			385,594,815	382,114,011	384,232,831	378,797,446
Basic			$ (1.61)	$ (2.13)	$ (4.63)	$ (2.01)
Diluted			$ (1.61)	$ (2.13)	$ (4.63)	$ (2.01)
Common stock, shares declared as stock dividend			2,100,119
Stock Options [Member]
Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares			4,028,819	3,832,533	4,781,109	3,768,666
Restricted Stock [Member]
Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares			3,353,371	1,507,788	2,844,365	1,787,257
Performance Units [Member]
Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares			780,920	129,202	577,624	116,185
Mandatory Convertible Preferred Stock [Member]
Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares			74,999,895	72,723,440	74,999,895	64,687,701
Common Stock [Member]
Earnings Per Share [Line Items]
Issuance of stock, shares		30,000,000
Common Stock [Member] | Subsequent Event [Member]
Earnings Per Share [Line Items]
Issuance of stock, shares	98,900,000