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Earnings Per Share (Notes)
9 Months Ended
Sep. 30, 2011
Earnings Per Share [Abstract] 
EARNINGS PER SHARE
EARNINGS PER SHARE

Components of basic and diluted earnings per share were as follows:

 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2011
 
2010
 
2011
 
2010
Numerator (in millions):
 
 
 
 
 
 
 
Net income attributable to Portland General Electric
Company common shareholders
$
27

 
$
49

 
$
118

 
$
100

Denominator (in thousands):
 
 
 
 
 
 
 
Weighted-average common shares outstanding - basic
75,342

 
75,295

 
75,329

 
75,267

Dilutive effect of unvested restricted stock units and employee stock purchase plan shares
16

 
16

 
16

 
15

Weighted-average common shares outstanding - diluted
75,358

 
75,311

 
75,345

 
75,282

Earnings per share:
 
 
 
 
 
 
 
     Basic
$
0.36

 
$
0.65

 
$
1.57

 
$
1.32

     Diluted
$
0.36

 
$
0.65

 
$
1.57

 
$
1.32


 
Unvested performance stock units and related dividend equivalent rights are not included in the computation of dilutive securities because vesting of these instruments is dependent upon three-year performance periods and the vesting criteria have not been met as of the end of the reporting period presented.

Basic and diluted earnings per share amounts are calculated based on actual amounts rather than the rounded amounts presented in the table above and on the condensed consolidated statements of income. Accordingly, calculations using the rounded amounts presented for net income and weighted average shares outstanding may yield results that vary from the earnings per share amounts presented in the table above.