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Long term debt (Tables)
 12 Months Ended
Dec. 31, 2012
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,
  
2012
 
2011
First Mortgage Bonds, rates range from 3.46% to 9.31%, with a weighted average rate of 5.84% in 2012 and 5.83% in 2011, due at various dates through 2040
$
1,515

 
$
1,615

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


142

Pollution Control Revenue Bonds owned by PGE
(21
)
 
(21
)
Unamortized debt discount
—

 
(1
)
Total long-term debt
1,636

 
1,735

Less: current portion of long-term debt
(100
)
 
(100
)
Long-term debt, net of current portion
$
1,536

 
$
1,635

 
 
 
 
Schedule of Maturities of Long-term Debt [Table Text Block]
As of December 31, 2012, the future minimum principal payments on long-term debt are as follows (in millions):

Years ending December 31:
 
 
2013
 
$
100

2014
 
—

2015
 
70

2016
 
67

2017
 
58

Thereafter
 
1,341

 
 
$
1,636