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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2012
Components of Earnings per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Components of basic and diluted earnings per share were as follows:

 
Three Months Ended
September 30,
 
Nine Months Ended September 30,
 
2012
 
2011
 
2012
 
2011
Numerator (in millions):
 
 
 
 
 
 
 
Net income attributable to Portland General Electric
Company common shareholders
$
38

 
$
27

 
$
113

 
$
118

Denominator (in thousands):
 
 
 
 
 
 
 
Weighted-average common shares outstanding—basic
75,528

 
75,342

 
75,486

 
75,329

Dilutive effect of unvested restricted stock units and
 employee stock purchase plan shares
13

 
16

 
14

 
16

Weighted-average common shares outstanding—diluted
75,541

 
75,358

 
75,500

 
75,345

 
 
 
 
 
 
 
 
Earnings per share—basic and diluted
$
0.50

 
$
0.36

 
$
1.49

 
$
1.57