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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2011
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

June 30,
 
Six Months Ended

June 30,
 
2011
 
2010
 
2011
 
2010
Numerator (in millions):
 
 
 
 
 
 
 
Net income attributable to Portland General Electric
Company common shareholders
$
22


 
$
24


 
$
91


 
$
51


Denominator (in thousands):
 
 
 
 
 
 
 
Weighted-average common shares outstanding - basic
75,326


 
75,276


 
75,322


 
75,253


Dilutive effect of unvested restricted stock units and
employee stock purchase plan shares
75


 
14


 
47


 
15


Weighted-average common shares outstanding - diluted
75,401


 
75,290


 
75,369


 
75,268


Earnings per share:
 
 
 
 
 
 
 
     Basic
$
0.29


 
$
0.32


 
$
1.21


 
$
0.68


     Diluted
$
0.29


 
$
0.32


 
$
1.21


 
$
0.68