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Impairments (Tables)
9 Months Ended
Sep. 30, 2016
Asset Impairment Charges [Abstract]  
Details of Impairment of Long-Lived Assets Held and Used by Asset
A summary of our impairments of fixed assets by asset class and other charges 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,
 
 
2016
 
2015
 
2016
 
2015
 
 
($ in millions)
Barnett Shale exit costs
 
$
616

 
$

 
$
616

 
$

Gathering systems
 
96

 

 
96

 

Natural gas compressors
 
32

 

 
52

 
21

Buildings and land
 
7

 

 
14

 

Other
 

 
79

 
17

 
146

Total impairments of fixed assets and other
 
$
751

 
$
79

 
$
795

 
$
167