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Balance Sheet Components (Tables) | 9 Months Ended
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Sep. 30, 2012
Balance Sheet Components [Abstract] |
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] | The activity in the allowance for uncollectible accounts is as follows (in millions):
| Nine Months Ended September 30,
| 2012 |  | 2011
Balance as of beginning of period | $ | 6 |  |  | $ | 5 |
Provision, net | 6 |  |  | 6 |
Amounts written off, less recoveries | (6 | ) |  | (6 | )
Balance as of end of period | $ | 6 |  |  | $ | 5 |
Schedule of Public Utility Property, Plant, and Equipment [Table Text Block] | Electric utility plant, net consists of the following (in millions):
| September 30, 2012 |  | December 31, 2011
Electric utility plant | $ | 6,726 |  |  | $ | 6,596 |
Construction work in progress | 168 |  |  | 120 |
Total cost | 6,894 |  |  | 6,716 |
Less: accumulated depreciation and amortization | (2,543 | ) |  | (2,431 | )
Electric utility plant, net | $ | 4,351 |  |  | $ | 4,285 |
Accumulated depreciation and amortization in the table above includes accumulated amortization related to intangible assets of $169 million and $153 million as of September 30, 2012 and December 31, 2011, respectively. Amortization expense related to intangible assets was $5 million for the three months ended September 30, 2012 and 2011, and $17 million and $14 million for the nine months ended September 30, 2012 and 2011, respectively. In January 2012, PGE completed construction of a $10 million, 1.75 MW solar powered electric generating facility, which was sold to, and simultaneously leased-back from, a financial institution. The Company operates the facility and receives 100% of the power generated by the facility.
Schedule of Regulatory Assets and Liabilities [Text Block] | Regulatory assets and liabilities consist of the following (in millions):
| September 30, 2012 |  | December 31, 2011
| Current |  | Noncurrent |  | Current |  | Noncurrent
Regulatory assets: |  |  |  |  |  |  |
Price risk management | $ | 142 |  |  | $ | 85 |  |  | $ | 194 |  |  | $ | 172 |
Pension and other postretirement plans | — |  |  | 280 |  |  | — |  |  | 295 |
Deferred income taxes | — |  |  | 78 |  |  | — |  |  | 87 |
Deferred broker settlements | 9 |  |  | 1 |  |  | 11 |  |  | — |
Debt reacquisition costs | — |  |  | 23 |  |  | — |  |  | 28 |
Other | 3 |  |  | 23 |  |  | 11 |  |  | 12 |
Total regulatory assets | $ | 154 |  |  | $ | 490 |  |  | $ | 216 |  |  | $ | 594 |
Regulatory liabilities: |  |  |  |  |  |  |
Asset retirement removal costs | $ | — |  |  | $ | 678 |  |  | $ | — |  |  | $ | 637 |
Asset retirement obligations | — |  |  | 39 |  |  | — |  |  | 36 |
Power cost adjustment mechanism | — |  |  | 6 |  |  | — |  |  | 10 |
Other | 4 |  |  | 37 |  |  | 6 |  |  | 37 |
Total regulatory liabilities | $ | 4 |  | (1) | $ | 760 |  |  | $ | 6 |  | (1) | $ | 720 |
(1) Included in Accrued expenses and other current liabilities in the condensed consolidated balance sheets.
Other Liabilities Disclosure [Text Block] | Accrued expenses and other current liabilities consist of the following (in millions):
| September 30, 2012 |  | December 31, 2011
Accrued taxes payable | $ | 65 |  |  | $ | 22 |
Accrued employee compensation and benefits | 44 |  |  | 44 |
Accrued interest payable | 35 |  |  | 24 |
Accrued dividends payable | 21 |  |  | 21 |
Other | 60 |  |  | 46 |
Total accrued expenses and other current liabilities | $ | 225 |  |  | $ | 157 |
Pension and Other Postretirement Benefits Disclosure [Text Block] | Components of net periodic benefit cost are as follows for the three and nine months ended September 30 (in millions):
| Three Months Ended September 30,
| Defined Benefit Pension Plan |  | Other Postretirement Benefits |  | Non-Qualified Benefit Plans
| 2012 |  | 2011 |  | 2012 |  | 2011 |  | 2012 |  | 2011
Service cost | $ | 3 |  |  | $ | 3 |  |  | $ | — |  |  | $ | 1 |  |  | $ | — |  |  | $ | — |
Interest cost | 8 |  |  | 7 |  |  | 1 |  |  | 1 |  |  | — |  |  | 1 |
Expected return on plan assets | (10 | ) |  | (10 | ) |  | — |  |  | — |  |  | — |  |  | — |
Amortization of prior service cost | — |  |  | — |  |  | 1 |  |  | — |  |  | — |  |  | — |
Amortization of net actuarial loss | 4 |  |  | 2 |  |  | — |  |  | — |  |  | — |  |  | — |
Net periodic benefit cost | $ | 5 |  |  | $ | 2 |  |  | $ | 2 |  |  | $ | 2 |  |  | $ | — |  |  | $ | 1 |
| Nine Months Ended September 30,
| Defined Benefit Pension Plan |  | Other Postretirement Benefits |  | Non-Qualified Benefit Plans
| 2012 |  | 2011 |  | 2012 |  | 2011 |  | 2012 |  | 2011
Service cost | $ | 9 |  |  | $ | 9 |  |  | $ | 1 |  |  | $ | 2 |  |  | $ | — |  |  | $ | — |
Interest cost | 24 |  |  | 21 |  |  | 3 |  |  | 3 |  |  | 1 |  |  | 2 |
Expected return on plan assets | (30 | ) |  | (30 | ) |  | — |  |  | — |  |  | — |  |  | — |
Amortization of prior service cost | — |  |  | — |  |  | 1 |  |  | — |  |  | — |  |  | — |
Amortization of net actuarial loss | 12 |  |  | 6 |  |  | — |  |  | — |  |  | — |  |  | — |
Net periodic benefit cost | $ | 15 |  |  | $ | 6 |  |  | $ | 5 |  |  | $ | 5 |  |  | $ | 1 |  |  | $ | 2 |

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