Net Gains on Sales of Fixed Assets (Tables)

6 Months Ended

Jun. 30, 2013

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment [Table Text Block]

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