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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Organization And Summary Of Significant Accounting Policies [Abstract]
Net income (loss)									$ (2,643)	$ (4,556)	$ 924
Mandatory convertible preferred stock dividend									108	106
Net Income (Loss) Attributable to Common Stock	$ (237)	$ (735)	$ (620)	$ (1,159)	$ (2,134)	$ (1,766)	$ (815)	$ 46	$ (2,751)	$ (4,662)	$ 924
Number of common shares: Weighted average outstanding									435,337,402	380,521,039	351,446,747
Number of common shares: Issued upon assumed exercise of outstanding stock options											241,603
Number of common shares: Effect of issuance of non-vested restricted common stock											448,415
Number of common shares: Effect of issuance of non-vested performance units											273,918
Number of common shares: Weighted average and potential dilutive outstanding									435,337,402	380,521,039	352,410,683
Basic	$ (0.48)	$ (1.52)	$ (1.61)	$ (3.03)	$ (5.58)	$ (4.62)	$ (2.13)	$ 0.12	$ (6.32)	$ (12.25)	$ 2.63
Diluted	$ (0.48)	$ (1.52)	$ (1.61)	$ (3.03)	$ (5.58)	$ (4.62)	$ (2.13)	$ 0.12	$ (6.32)	$ (12.25)	$ 2.62