Quarterly Financial Data (Notes)

12 Months Ended

Dec. 31, 2012

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information [Text Block]

Quarterly Financial Data (unaudited)

Summarized unaudited quarterly financial data for 2012 and 2011 are as follows ($ in millions except per share data):

	Quarters Ended
	March 31, 2012			June 30, 2012		September 30, 2012			December 31, 2012
Total revenues	$	2,419		$	3,389	$	2,970		$	3,538
Gross profit(a)(b)	$	6		$	738	$	(3,194	)	$	756
Net income (loss) attributable to Chesapeake(b)	$	(28	)	$	972	$	(2,012	)	$	299
Net income (loss) available to common stockholders(b)	$	(71	)	$	929	$	(2,055	)	$	257
Net earnings (loss) per common share:
Basic	$	(0.11	)	$	1.45	$	(3.19	)	$	0.39
Diluted	$	(0.11	)	$	1.29	$	(3.19	)	$	0.39

	Quarters Ended
	March 31, 2011			June 30, 2011		September 30, 2011		December 31, 2011
Total revenues	$	1,612		$	3,318	$	3,977	$	2,728
Gross profit(a)	$	(284	)	$	985	$	1,483	$	737
Net income (loss) attributable to Chesapeake	$	(162	)	$	510	$	922	$	472
Net income (loss) available to common stockholders	$	(205	)	$	467	$	879	$	429
Net earnings (loss) per common share:
Basic	$	(0.32	)	$	0.74	$	1.38	$	0.67
Diluted	$	(0.32	)	$	0.68	$	1.23	$	0.63

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(a) Total revenue less operating costs.

(b) Includes a $3.315 billion ceiling test write-down on our natural gas and oil properties for the quarter ended September 30, 2012.