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Other Property and Equipment (Tables)
 9 Months Ended
Sep. 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
September 30,
 
Nine Months Ended
September 30,
 
 
2015
 
2014
 
2015
 
2014
 
 
($ in millions)
Natural gas compressors
 
$
(1
)
 
$
(75
)
 
$
(1
)
 
$
(195
)
Gathering systems and treating plants
 
1

 
(5
)
 
1

 
8

Oilfield services equipment
 
—

 
—

 
—

 
(7
)
Buildings and land
 
(1
)
 
(6
)
 
—

 
(5
)
Other
 
—

 
—

 
3

 
(2
)
Total net (gains) losses on sales of fixed assets
 
$
(1
)
 
$
(86
)
 
$
3

 
$
(201
)