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Impairments of Fixed Assets and Other (Tables)
6 Months Ended
Jun. 30, 2013
Impairments of Fixed Assets and Other [Abstract]  
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table Text Block]
A summary of our impairments of fixed assets and other by asset class 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,
 
 
2013
 
2012
 
2013
 
2012
 
 
($ in millions)
Buildings and land
 
$
213

 
$
219

 
$
239

 
$
219

Drilling rigs and equipment
 
4

 
24

 
4

 
24

Other
 
14

 

 
15

 

Total impairments
 
$
231

 
$
243

 
$
258

 
$
243