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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]  
Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block]
The Company has the following firm commitments that are not reflected on the Consolidated Balance Sheet. Minimum payments as of December 31, 2014 are as follows (in millions):
 
 
 
 
 
 
 
 
 
 
 
 
2020 and
 
 
 
 
2015
 
2016
 
2017
 
2018
 
2019
 
Thereafter
 
Total
Contract type:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Fuel, capacity and transmission contract commitments
 
$
2,327

 
$
1,765

 
$
1,553

 
$
1,216

 
$
1,140

 
$
8,777

 
$
16,778

Construction commitments
 
1,280

 
117

 
18

 
8

 
3

 
9

 
1,435

Operating leases and easements
 
143

 
120

 
102

 
84

 
67

 
861

 
1,377

Maintenance, service and other contracts
 
187

 
160

 
161

 
153

 
161

 
966

 
1,788

 
 
$
3,937

 
$
2,162

 
$
1,834

 
$
1,461

 
$
1,371

 
$
10,613

 
$
21,378