Net Gains on Sales of Fixed AssetsText Block (Notes)

6 Months Ended

Jun. 30, 2013

Gain (Loss) on Disposition of Assets for Financial Service Operations [Abstract]

Property, Plant and Equipment Disclosure [Text Block]

Net Gains on Sales of Fixed Assets

For assets outside of our full cost pool, the cost of assets retired or otherwise disposed of and the applicable accumulated depreciation are removed from accounts, and the resulting gain or loss is reflected as a component of operating expenses. A summary of our gains or losses by asset class for the Current Quarter, the Prior Quarter, the Current Period and the Prior Period is as follows:

	Three Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012
	($ in millions)
Gathering systems and treating plants	$	109		$	—		$	179		$	1
Drilling rigs and equipment	—			(1		)	(1		)	(2		)
Buildings and land	(1		)	—			(23		)	—
Other	1			1			3			3
Total net gains on sales of fixed assets	$	109		$	—		$	158		$	2

Gathering Systems and Treating Plants

In the Current Quarter, our wholly owned midstream subsidiary, CMD, sold its wholly owned subsidiary, Granite Wash Midstream Gas Services, L.L.C. (GWMGS), to MarkWest Oklahoma Gas Company, L.L.C., a wholly owned subsidiary of MarkWest Energy Partners, L.P. (NYSE:MWE), for net proceeds of approximately $245 million, subject to post-closing adjustments. We recorded a $106 million pre-tax gain associated with this transaction. GWMGS owns certain midstream assets in the Anadarko Basin that service the Granite Wash and Hogshooter formations. The transaction with MWE included long-term fixed-fee agreements for gas gathering, compression, treating and processing services.

In the Current Period, we sold our interest in certain gathering system assets in Pennsylvania to Western Gas Partners, LP (NYSE:WES) for proceeds of approximately $134 million. We recorded a $56 million pre-tax gain associated with this transaction.

Buildings and Land

In the Current Period, the net losses on sales of buildings and land were primarily from the sale of certain of our buildings and land in our Barnett Shale operating area.