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Disposals and Discontinued Operations Disposals and Discontinued Operations (Tables)
 12 Months Ended
Dec. 31, 2012
Discontinued Operations and Disposal Groups [Abstract]  
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block]
 
Year Ended December 31
 
2012
 
2011
 
2010
 
 
 
(In millions)
 
 
Operating Revenues
$
55

 
$
39

 
$
32

 
 
 
 
 
 
Operation and Maintenance
24

 
16

 
11

Depreciation, Depletion and Amortization
23

 
18

 
15

Taxes Other than Income
4

 
3

 
2

Asset (Gains) and Losses, Net
83

 
—

 
10

 
134

 
37

 
38

Operating Income
(79
)
 
2

 
(6
)
Other (Income) and Deductions
6

 
6

 
6

Loss Before Income Taxes
(85
)
 
(4
)
 
(12
)
Income Tax Benefit
(29
)
 
(1
)
 
(4
)
Net Loss
$
(56
)
 
$
(3
)
 
$
(8
)