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Equity (Tables) | 9 Months Ended
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Sep. 30, 2013
Equity [Abstract] |
Schedule of Stockholders Equity [Table Text Block] | The activity in equity during the nine month periods ended September 30, 2013 and 2012 is as follows (dollars in millions):
| Portland General Electric Company Shareholders’ Equity |  |  |
| Common Stock |  | Accumulated Other Comprehensive Loss |  | Retained Earnings |  |  | Noncontrolling Interests’ Equity
| Shares |  | Amount |  |  |  |
Balances as of December 31, 2012 | 75,556,272 |  |  | $ | 841 |  |  | $ | (6 | ) |  | $ | 893 |  |  |  | $ | 2 |
Issuances of common stock, net of issuance costs of $3 | 2,365,000 |  |  | 67 |  |  | — |  |  | — |  |  |  | — |
Issuance of shares pursuant to equity-based plans | 146,027 |  |  | — |  |  | — |  |  | — |  |  |  | — |
Stock-based compensation | — |  |  | 2 |  |  | — |  |  | — |  |  |  | — |
Dividends declared | — |  |  | — |  |  | — |  |  | (63 | ) |  |  | — |
Net income (loss) | — |  |  | — |  |  | — |  |  | 58 |  |  |  | (1 | )
Balances as of September 30, 2013 | 78,067,299 |  |  | $ | 910 |  |  | $ | (6 | ) |  | $ | 888 |  |  |  | $ | 1 |
Balances as of December 31, 2011 | 75,362,956 |  |  | $ | 836 |  |  | $ | (6 | ) |  | $ | 833 |  |  |  | $ | 3 |
Issuance of shares pursuant to equity-based plans | 171,430 |  |  | — |  |  | — |  |  | — |  |  |  | — |
Stock-based compensation | — |  |  | 2 |  |  | — |  |  | — |  |  |  | — |
Dividends declared | — |  |  | — |  |  | — |  |  | (61 | ) |  |  | — |
Net income (loss) | — |  |  | — |  |  | — |  |  | 113 |  |  |  | (1 | )
Balances as of September 30, 2012 | 75,534,386 |  |  | $ | 838 |  |  | $ | (6 | ) |  | $ | 885 |  |  |  | $ | 2 |

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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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