Organization And Summary Of Significant Accounting Policies (Schedule Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share [Line Items]
Net income (loss)									$ (4,556)	$ 924	$ 704
Mandatory convertible preferred stock dividend									106
Net Income (Loss) Attributable to Common Stock	$ (2,134)	$ (1,766)	$ (815)	$ 46	$ 312	$ 211	$ 207	$ 194	$ (4,662)	$ 924	$ 704
Number of common shares, Weighted average outstanding									380,521,039	351,446,747	350,465,430
Number of common shares: Issued upon assumed exercise of outstanding stock options										241,603	377,626
Number of common shares: Effect of issuance of non-vested restricted common stock										448,415	258,396
Number of common shares: Effect of issuance of non-vested performance units										273,918
Number of common shares, Weighted average and potential dilutive outstanding									380,521,039	352,410,683	351,101,452
Basic	$ (5.58)	$ (4.62)	$ (2.13)	$ 0.12	$ 0.89	$ 0.60	$ 0.59	$ 0.55	$ (12.25)	$ 2.63	$ 2.01
Diluted	$ (5.58)	$ (4.62)	$ (2.13)	$ 0.12	$ 0.88	$ 0.60	$ 0.59	$ 0.55	$ (12.25)	$ 2.62	$ 2.00
Stock Options [Member]
Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares									3,835,234	1,446,004	1,634,695
Restricted Stock [Member]
Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares									1,990,383	29,879	114,433
Performance Units [Member]
Earnings Per Share [Line Items]
Number of common shares: Effect of issuance of non-vested performance units											0
Antidilutive securities excluded from computation of earnings per share, shares									140,414
Mandatory Convertible Preferred Stock [Member]
Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares									70,890,312	0	0