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Other Property and Equipment (Tables)
 6 Months Ended
Jun. 30, 2015
Gain (Loss) on Disposition of Property Plant Equipment [Abstract]  
Property, Plant and Equipment
A summary by asset class of (gains) or losses on sales of fixed assets 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,
 
 
2015
 
2014
 
2015
 
2014
 
 
($ in millions)
Natural gas compressors
 
$
—

 
$
(94
)
 
$
—

 
$
(120
)
Gathering systems and treating plants
 
—

 
10

 
—

 
13

Oilfield services equipment
 
—

 
(9
)
 
—

 
(7
)
Buildings and land
 
—

 
1

 
1

 
1

Other
 
1

 
(1
)
 
3

 
(2
)
Total net (gains) losses on sales of fixed assets
 
$
1

 
$
(93
)
 
$
4

 
$
(115
)