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Net Gains (Losses) on Sales of Fixed Assets (Tables)
 9 Months Ended
Sep. 30, 2013
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, Schedule of Significant Acquisitions and Disposals [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
September 30,
 
Nine Months Ended
September 30,
 
 
2013
 
2012
 
2013
 
2012
 
 
($ in millions)
Gathering systems and treating plants
 
$
(132
)
 
$
(7
)
 
$
(311
)
 
$
(8
)
Drilling rigs and equipment
 
—

 
10

 
1

 
12

Buildings and land
 
1

 
—

 
24

 
—

Other
 
(1
)
 
4

 
(4
)
 
1

Total net (gains) losses on sales of fixed assets
 
$
(132
)
 
$
7

 
$
(290
)
 
$
5