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Significant Accounting Policies (Tables)
9 Months Ended
Sep. 30, 2014
Accounting Policies [Abstract]  
Schedule of Finite-Lived Intangible Assets by Major Class [Table Text Block]
The Company has certain intangible assets relating to emission allowances, renewable energy credits and non-utility contracts as shown below:
 
September 30, 2014
 
December 31, 2013
 
(In millions)
Emission allowances
$
1

 
$
2

Renewable energy credits
50

 
51

Contract intangible assets
123

 
126

 
174

 
179

Less accumulated amortization
54

 
45

Intangible assets, net
120

 
134

Less current intangible assets
12

 
12

 
$
108

 
$
122