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Long term debt (Tables)
 12 Months Ended
Dec. 31, 2014
Long-term Debt, Unclassified [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
Long-term debt consists of the following (in millions):
 
As of December 31,
  
2014
 
2013
First Mortgage Bonds, rates range from 3.46% to 9.31%, with a weighted average rate of 5.42% in 2014 and 5.62% in 2013, due at various dates through 2048
$
2,075

 
$
1,795

Unsecured term bank loans, rates range from 0.86% to 0.93%, due October 2015
305

 
—

Pollution Control Revenue Bonds, 5% rate, due 2033
142


148

Pollution Control Revenue Bonds owned by PGE
(21
)
 
(27
)
Total long-term debt
2,501

 
1,916

Less: current portion of long-term debt
(375
)
 
—

Long-term debt, net of current portion
$
2,126

 
$
1,916

 
 
 
 
Schedule of Maturities of Long-term Debt [Table Text Block]
As of December 31, 2014, the future minimum principal payments on long-term debt are as follows (in millions):

Years ending December 31:
 
 
2015
 
$
375

2016
 
67

2017
 
58

2018
 
75

2019
 
300

Thereafter
 
1,626

 
 
$
2,501