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Equity (Tables)
 3 Months Ended
Mar. 31, 2013
Equity [Abstract]  
Schedule of Stockholders Equity [Table Text Block]
The activity in equity during the three month periods ended March 31, 2013 and 2012 is as follows (dollars in millions):
 
Portland General Electric Company
Shareholders’ Equity
 
 
 
 
Common Stock
 
Accumulated
Other
Comprehensive
Loss
 
Retained
Earnings
 
 
Noncontrolling
Interests’
Equity
 
 
 
 
 
 
Shares
 
Amount
 
 
 
 
Balances as of December 31, 2012
75,556,272

 
$
841

 
$
(6
)
 
$
893

 
 
$
2

Issuance of shares pursuant to equity-based plans
120,909

 
—

 
—

 
—

 
 
—

Dividends declared
—

 
—

 
—

 
(20
)
 
 
—

Net income (loss)
—

 
—

 
—

 
49

 
 
(1
)
Balances as of March 31, 2013
75,677,181

 
$
841

 
$
(6
)
 
$
922

 
 
$
1

 
 
 
 
 
 
 
 
 
 
 
Balances as of December 31, 2011
75,362,956

 
$
836

 
$
(6
)
 
$
833

 
 
$
3

Issuance of shares pursuant to equity-based plans
141,624

 
—

 
—

 
—

 
 
—

Dividends declared
—

 
—

 
—

 
(20
)
 
 
—

Net income
—

 
—

 
—

 
49

 
 
—

Balances as of March 31, 2012
75,504,580

 
$
836

 
$
(6
)
 
$
862

 
 
$
3