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Earnings Per Share (Tables) | 6 Months Ended
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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 |

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- Definition Components of Earnings per Share [Abstract] + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + Details
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