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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2013
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,
| 2013 |  | 2012
Numerator (in millions): |  |  |
Net income attributable to Portland General Electric Company common shareholders | $ | 49 |  |  | $ | 49 |
Denominator (in thousands): |  |  |
Weighted-average common shares outstanding—basic | 75,608 |  |  | 75,423 |
Dilutive effect of unvested restricted stock units and employee stock purchase plan shares | 91 |  |  | 20 |
Weighted-average common shares outstanding—diluted | 75,699 |  |  | 75,443 |
Earnings per share—basic and diluted | $ | 0.65 |  |  | $ | 0.65 |
In addition to unvested time-based restricted stock units and employee stock purchase plan shares, unvested performance-based restricted stock units and related dividend equivalent rights are included in the computation of dilutive securities when the required performance goals are met at the end of a three-year performance period. For the three months ended March 31, 2013 and 2012, unvested performance-based restricted stock units and related dividend equivalent rights of 430,824 and 462,413, respectively, were excluded from the dilutive calculation because the performance goals had not been met. 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.

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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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