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Quarterly Financial Data (unaudited)
 12 Months Ended
Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Data (unaudited)
Quarterly Financial Data (unaudited)
(in millions)
First
 
Second
 
Third
 
Fourth
  
Total
2011
 
 
 
 
 
 
 
  
 
Operating revenues
$
550

 
$
536

 
$
595

 
$
499

  
$
2,180

Operating income (loss)
17

 
(54
)
 
55

 
(1,759
)
 
(1,741
)
Income (loss) from continuing operations
(18
)
 
(31
)
 
33

 
(1,060
)
 
(1,076
)
Income (loss) from operations of discontinued subsidiaries, net of tax
(2
)
 
(1
)
 
—

 
—

  
(3
)
Net income (loss)
(20
)
 
(32
)
 
33

 
(1,060
)
1 
(1,079
)
2010
 
 
 
 
 
 
 
  
 
Operating revenues
$
651

 
$
493

 
$
691

 
$
588

  
$
2,423

Operating income (loss)
130

 
(46
)
 
179

 
44

  
307

Income (loss) from continuing operations
75

 
(20
)
 
118

 
(14
)
 
159

Income (loss) from operations of discontinued subsidiaries, net of tax
6

 
3

 
(5
)
 
—

  
4

Net income (loss)
81

 
(17
)
 
113

 
(14
)
2 
163

1 
Reflects charges of $1,736 million pre-tax ($1,047 million, after tax) related to impairments. For more information, see Note 13—Asset Impairments and Other Charges.
2 
Reflects a $40 million pre-tax ($24 million, after tax) write-off of capitalized costs at the Powerton Station. For more information, see Note 13—Asset Impairments and Other Charges.