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Income Taxes Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2011
Income Taxes [Abstract] |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] | Income tax expense (benefit) consists of the following (in millions):
| Years Ended December 31,
| 2011 |  | 2010 |  | 2009
Current: |  |  |  |  |
Federal | $ | 2 |  |  | $ | (20 | ) |  | $ | (46 | )
State and local | — |  |  | — |  |  | — |
| 2 |  |  | (20 | ) |  | (46 | )
Deferred: |  |  |  |  |
Federal | 43 |  |  | 61 |  |  | 78 |
State and local | 13 |  |  | 12 |  |  | 6 |
| 56 |  |  | 73 |  |  | 84 |
Investment tax credit adjustments | — |  |  | — |  |  | (2 | )
Income tax expense | $ | 58 |  |  | $ | 53 |  |  | $ | 36 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | The significant differences between the U.S. federal statutory rate and PGE’s effective tax rate for financial reporting purposes are as follows:
| Years Ended December 31,
| 2011 |  | 2010 |  | 2009
Federal statutory tax rate | 35.0 | % |  | 35.0 | % |  | 35.0 | %
Federal tax credits | (12.7 | ) |  | (10.4 | ) |  | (8.3 | )
State and local taxes, net of federal tax benefit | 2.6 |  |  | 4.4 |  |  | 3.4 |
Flow through depreciation and cost basis differences | 2.1 |  |  | 0.1 |  |  | (1.6 | )
Investment tax credit amortization | — |  |  | — |  |  | (1.5 | )
Other | 1.3 |  |  | 1.2 |  |  | 1.8 |
Effective tax rate | 28.3 | % |  | 30.3 | % |  | 28.8 | %
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] | Deferred income tax assets and liabilities consist of the following (in millions):
| As of December 31,
| 2011 |  | 2010
Deferred income tax assets: |  |  |
Price risk management | $ | 145 |  |  | $ | 72 |
Employee benefits | 135 |  |  | 98 |
Tax credits, net of valuation allowance | 56 |  |  | 40 |
Regulatory liabilities | 22 |  |  | 37 |
Tax loss carryforwards | 1 |  |  | 17 |
Total deferred income tax assets | 359 |  |  | 264 |
Deferred income tax liabilities: |  |  |
Depreciation and amortization | 572 |  |  | 534 |
Regulatory assets | 274 |  |  | 175 |
Other | 9 |  |  | 4 |
Total deferred income tax liabilities | 855 |  |  | 713 |
Deferred income tax liability, net | $ | (496 | ) |  | $ | (449 | )
Classification of net deferred income taxes: |  |  |
Current deferred income tax asset (1) | $ | 33 |  |  | $ | — |
Current deferred income tax liability (2) | — |  |  | (4 | )
Noncurrent deferred income tax liability | (529 | ) |  | (445 | )
| $ | (496 | ) |  | $ | (449 | )
(1) | Included in Other current assets in the consolidated balance sheets.
(2) | Included in Accrued expenses and other current liabilities in the consolidated balance sheets.

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 740 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph -Name Accounting Standards Codification -Paragraph 9 -Section 50 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 740 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph -Name Accounting Standards Codification -Paragraph 2 -Section 50 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 740 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph -Name Accounting Standards Codification -Paragraph 12 -Section 50 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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