Other Property and Equipment (Tables)

3 Months Ended

Mar. 31, 2015

Gain (Loss) on Disposition of Property Plant Equipment [Abstract]

Property, Plant and Equipment [Table Text Block]

A summary by asset class of (gains) or losses on sales of fixed assets for the Current Quarter and the Prior Quarter is as follows:

	Three Months Ended March 31,
	2015		2014
	($ in millions)
Natural gas compressors	$	—	$	(26	)
Gathering systems and treating plants	—		3
Oilfield services equipment	—		2
Buildings and land	1		—
Other	2		(2		)
Total net (gains) losses on sales of fixed assets	$	3	$	(23	)