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Discontinued Operations (Tables)
9 Months Ended
Sep. 30, 2013
Discontinued Operations  
Summarized results income statement, assets and liabilities of discontinued operations
The summarized results of operations included in income from discontinued operations were as follows (in millions):
 
   
Three months ended
September 30,
   
Nine months ended
September 30,
 
   
2013
   
2012
   
2013
   
2012
 
Operating revenues
 
$
193
   
$
266
   
$
662
   
$
744
 
Operating and maintenance expense
   
(188
)
   
(241
)
   
(672
)
   
(719
)
Depreciation and amortization expense
   
     
(48
)
   
     
(183
)
Loss on impairment of assets in discontinued operations
   
(14
)
   
(878
)
   
(14
)
   
(983
)
Gain (loss) on disposal of assets in discontinued operations, net
   
31
     
(1
)
   
49
     
70
 
Other income, net
   
2
     
     
4
     
 
Income (loss) from discontinued operations before income tax expense
   
24
     
(902
)
   
29
     
(1,071
)
Income tax benefit (expense)
   
(20
)
   
(14
)
   
(35
)
   
19
 
Income (loss) from discontinued operations, net of tax
 
$
4
   
$
(916
)
 
$
(6
)
 
$
(1,052
)
 

 
The carrying amounts of the major classes of assets and liabilities associated with our discontinued operations were classified as follows (in millions):
 
   
September 30,
2013
   
December 31,
2012
 
Assets
               
Rigs and related equipment, net
 
$
35
   
$
104
 
Materials and supplies, net
   
44
     
71
 
Other related assets
   
7
     
4
 
Assets held for sale
 
$
86
   
$
179
 
                 
Liabilities
               
Deferred revenues
 
$
62
   
$
32
 
Other liabilities
   
     
3
 
Other current liabilities
 
$
62
   
$
35