In accordance with accounting guidance for disclosures about segments of an enterprise and related information, we have two reportable operating segments. Our exploration and production operating segment and natural gas and oil marketing, gathering and compression operating segment are managed separately because of the nature of their products and services. The exploration and production operating segment is responsible for finding and producing natural gas and oil. The marketing, gathering and compression operating segment is responsible for marketing, gathering and compression of natural gas and oil primarily from Chesapeake-operated wells. We also have contract drilling, oilfield trucking, oilfield rental and other oilfield service operations which are responsible for providing services for both Chesapeake-operated wells and wells operated by third parties. Our contract drilling, oilfield trucking, oilfield rental and other oilfield service operations are included in "Other Operations" in the following table:

Management evaluates the performance of our segments based upon income (loss) before income taxes. Revenues from the sale of natural gas and oil related to Chesapeake's ownership interests by the marketing, gathering and compression operating segment are reflected as exploration and production revenues. Such amounts totaled $1.324 billion, $1.045 billion, $3.739 billion and $2.978 billion for the Current Quarter, the Prior Quarter, the Current Period and the Prior Period, respectively. The following table presents selected financial information for Chesapeake's operating segments.

		Intercompany		Intercompany			Intercompany			Intercompany			Intercompany
	Exploration and Production		Marketing, Gathering and Compression			Other Operations			Intercompany Eliminations			Consolidated Total
	($ in millions)
Three Months Ended September 30, 2011:
Revenues	$	2,402	$	2,746		$	343		$	(1,514	)	$	3,977
Intersegment revenues		—		(1,324	)		(190	)		1,514			—

Total revenues	$	2,402	$	1,422		$	153		$	—		$	3,977


Income before income taxes	$	1,496	$	79		$	23		$	(87	)	$	1,511


Three Months Ended September 30, 2010:
Revenues	$	1,639	$	1,928		$	187		$	(1,173	)	$	2,581
Intersegment revenues		—		(1,045	)		(128	)		1,173			—

Total revenues	$	1,639	$	883		$	59		$	—		$	2,581


Income (loss) before income taxes	$	822	$	96		$	(7	)	$	(4	)	$	907


Nine Months Ended September 30, 2011:
Revenues	$	4,688	$	7,583		$	866		$	(4,229	)	$	8,908
Intersegment revenues		—		(3,739	)		(490	)		4,229			—

Total revenues	$	4,688	$	3,844		$	376		$	—		$	8,908


Income before income taxes	$	2,007	$	239		$	66		$	(231	)	$	2,081


Nine Months Ended September 30, 2010:
Revenues	$	4,698	$	5,498		$	538		$	(3,343	)	$	7,391
Intersegment revenues		—		(2,978	)		(365	)		3,343			—

Total revenues	$	4,698	$	2,520		$	173		$	—		$	7,391


Income (loss) before income taxes	$	2,401	$	152		$	(32	)	$	(1	)	$	2,520


As of September 30 2011:
Total assets	$	35,991	$	3,885		$	1,604		$	(1,358	)	$	40,122

As of December 31, 2010:
Total assets	$	33,560	$	3,458		$	854		$	(693	)	$	37,179