Supplemental Quarterly Results (Tables)

12 Months Ended

Dec. 31, 2016

Supplemental Quarterly Results [Abstract]

Schedule Of Quarterly Financial Information

	1st Quarter		2nd Quarter		3rd Quarter		4th Quarter
	(in millions, except per share amounts)
	2016
Operating revenues	$	579	$	522	$	651	$	684
Operating income (loss) (1)		(1,100)		(492)		(725)		122
Net loss attributable to common stock		(1,159)		(620)		(735)		(237)
Loss per share - Basic		(3.03)		(1.61)		(1.52)		(0.48)
Loss per share - Diluted		(3.03)		(1.61)		(1.52)		(0.48)
	2015
Operating revenues	$	933	$	764	$	749	$	687
Operating income (loss) (1)		165		(1,284)		(2,842)		(2,561)
Net income (loss) attributable to common stock (2)		46		(815)		(1,766)		(2,134)
Earnings (Loss) per share - Basic		0.12		(2.13)		(4.62)		(5.58)
Earnings (Loss) per share - Diluted		0.12		(2.13)		(4.62)		(5.58)

(1) The operating losses for the first, second and third quarters of 2016 included non-cash full cost impairments of natural gas and oil properties of $1,034 million, $470 million, and $817 million, respectively. There was no full cost impairment in the fourth quarter of 2016. The operating losses for the second, third and fourth quarters of 2015 included non-cash full cost impairments of natural gas and oil properties of $1,535 million, $2,839 million and $2,576 million, respectively.

(2) Net income attributable to common stock was reduced by $7 million in the first quarter of 2015 to recognize the portion of the Company’s net income that would be distributed to the holders of preferred securities (mandatory convertible preferred stock) at year-end.  However, as a result of the Company’s net loss in the second quarter that persisted for the year ended December 31, 2015, participating securities were ultimately not entitled to receive a distribution.