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Earnings Per Share (Tables)
 6 Months Ended
Jun. 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
June 30,
 
Six Months Ended June 30,
 
2012
 
2011
 
2012
 
2011
Numerator (in millions):
 
 
 
 
 
 
 
Net income attributable to Portland General Electric
Company common shareholders
$
26

 
$
22

 
$
75

 
$
91

Denominator (in thousands):
 
 
 
 
 
 
 
Weighted-average common shares outstanding—basic
75,507

 
75,326

 
75,465

 
75,322

Dilutive effect of unvested restricted stock units and
 employee stock purchase plan shares
10

 
75

 
14

 
47

Weighted-average common shares outstanding—diluted
75,517

 
75,401

 
75,479

 
75,369

 
 
 
 
 
 
 
 
Earnings per share—basic and diluted
$
0.34

 
$
0.29

 
$
0.99

 
$
1.21