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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2012
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | Components of basic and diluted earnings per share are as follows:
| Years Ended December 31,
| 2012 |  | 2011 |  | 2010
Numerator (in millions): |  |  |  |  |
Net income attributable to Portland General Electric Company common shareholders | $ | 141 |  |  | $ | 147 |  |  | $ | 125 |
Denominator (in thousands): |  |  |  |  |
Weighted average common shares outstanding—basic | 75,498 |  |  | 75,333 |  |  | 75,275 |
Dilutive effect of unvested restricted stock units and employee stock purchase plan shares | 149 |  |  | 17 |  |  | 16 |
Weighted average common shares outstanding—diluted | 75,647 |  |  | 75,350 |  |  | 75,291 |
Earnings per share—basic and diluted | $ | 1.87 |  |  | $ | 1.95 |  |  | $ | 1.66 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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