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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 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
March 31,
 
2012
 
2011
Numerator (in millions):
 
 
 
Net income attributable to Portland General Electric
Company common shareholders
$
49

 
$
69

Denominator (in thousands):
 
 
 
Weighted-average common shares outstanding - basic
75,423

 
75,318

Dilutive effect of unvested restricted stock units and
 employee stock purchase plan shares
20

 
19

Weighted-average common shares outstanding - diluted
75,443

 
75,337

 
 
 
 
Earnings per share - basic and diluted
$
0.65

 
$
0.92