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Equity (Tables) | 3 Months Ended
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Mar. 31, 2012
Equity [Abstract] |
Schedule of Stockholders Equity [Table Text Block] | The activity in equity during the three months ended March 31, 2012 and 2011 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, 2011 | 75,362,956 |  |  | $ | 836 |  |  | $ | (6 | ) |  | $ | 833 |  |  |  | $ | 3 |
Vesting of restricted and performance stock units | 140,714 |  |  | — |  |  | — |  |  | — |  |  |  | — |
Issuance of shares pursuant to dividend reinvestment and direct stock purchase plan | 910 |  |  | — |  |  | — |  |  | — |  |  |  | — |
Stock-based compensation | — |  |  | — |  |  | — |  |  | — |  |  |  | — |
Dividends declared | — |  |  | — |  |  | — |  |  | (20 | ) |  |  | — |
Noncontrolling interests’ capital distributions | — |  |  | — |  |  | — |  |  | — |  |  |  | — |
Net income | — |  |  | — |  |  | — |  |  | 49 |  |  |  | — |
Balances as of March 31, 2012 | 75,504,580 |  |  | $ | 836 |  |  | $ | (6 | ) |  | $ | 862 |  |  |  | $ | 3 |
Balances as of December 31, 2010 | 75,316,419 |  |  | $ | 831 |  |  | $ | (5 | ) |  | $ | 766 |  |  |  | $ | 7 |
Vesting of restricted stock units | 9,184 |  |  | — |  |  | — |  |  | — |  |  |  | — |
Stock-based compensation | — |  |  | 1 |  |  | — |  |  | — |  |  |  | — |
Dividends declared | — |  |  | — |  |  | — |  |  | (20 | ) |  |  | — |
Noncontrolling interests’ capital distributions | — |  |  | — |  |  | — |  |  | — |  |  |  | (4 | )
Net income | — |  |  | — |  |  | — |  |  | 69 |  |  |  | — |
Balances as of March 31, 2011 | 75,325,603 |  |  | $ | 832 |  |  | $ | (5 | ) |  | $ | 815 |  |  |  | $ | 3 |

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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 -Topic 505 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph -Name Accounting Standards Codification -Paragraph 2 -Section 50 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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