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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 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 September 30, |  | Nine Months Ended September 30,
| 2013 |  | 2012 |  | 2013 |  | 2012
Numerator (in millions): |  |  |  |  |  |  |
Net income attributable to Portland General Electric Company common shareholders | $ | 31 |  |  | $ | 38 |  |  | $ | 58 |  |  | $ | 113 |
Denominator (in thousands): |  |  |  |  |  |  |
Weighted-average common shares outstanding—basic | 77,637 |  |  | 75,528 |  |  | 76,401 |  |  | 75,486 |
Dilutive effect of potential common shares | 693 |  |  | 13 |  |  | 302 |  |  | 14 |
Weighted-average common shares outstanding—diluted | 78,330 |  |  | 75,541 |  |  | 76,703 |  |  | 75,500 |
Earnings per share—basic and diluted | $ | 0.40 |  |  | $ | 0.50 |  |  | $ | 0.76 |  |  | $ | 1.49 |
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, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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