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Balance Sheet Components (Tables) | 9 Months Ended
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Sep. 30, 2013
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,
| 2013 |  | 2012
Balance as of beginning of period | $ | 5 |  |  | $ | 6 |
Provision, net | 4 |  |  | 6 |
Amounts written off, less recoveries | (4 | ) |  | (6 | )
Balance as of end of period | $ | 5 |  |  | $ | 6 |
Schedule of Other Current Assets [Table Text Block] | Other current assets consist of the following (in millions):
| September 30, 2013 |  | December 31, 2012
Prepaid expenses | $ | 25 |  |  | $ | 37 |
Current deferred income tax asset | 37 |  |  | 51 |
Assets from price risk management activities | 1 |  |  | 4 |
Other | — |  |  | 1 |
Other current assets | $ | 63 |  |  | $ | 93 |
Schedule of Public Utility Property, Plant, and Equipment [Table Text Block] | Electric utility plant, net consists of the following (in millions):
| September 30, 2013 |  | December 31, 2012
Electric utility plant | $ | 6,975 |  |  | $ | 6,811 |
Construction work in progress | 377 |  |  | 140 |
Total cost | 7,352 |  |  | 6,951 |
Less: accumulated depreciation and amortization | (2,693 | ) |  | (2,559 | )
Electric utility plant, net | $ | 4,659 |  |  | $ | 4,392 |
Schedule of Regulatory Assets and Liabilities [Text Block] | Regulatory assets and liabilities consist of the following (in millions):
| September 30, 2013 |  | December 31, 2012
| Current |  | Noncurrent |  | Current |  | Noncurrent
Regulatory assets: |  |  |  |  |  |  |
Price risk management | $ | 88 |  |  | $ | 71 |  |  | $ | 123 |  |  | $ | 71 |
Pension and other postretirement plans | — |  |  | 301 |  |  | — |  |  | 321 |
Deferred income taxes | — |  |  | 74 |  |  | — |  |  | 80 |
Deferred broker settlements | 8 |  |  | — |  |  | 20 |  |  | 1 |
Debt reacquisition costs | — |  |  | 18 |  |  | — |  |  | 22 |
Deferred capital projects | — |  |  | 29 |  |  | — |  |  | 16 |
Other | 3 |  |  | 11 |  |  | 1 |  |  | 13 |
Total regulatory assets | $ | 99 |  |  | $ | 504 |  |  | $ | 144 |  |  | $ | 524 |
Regulatory liabilities: |  |  |  |  |  |  |
Asset retirement removal costs | $ | — |  |  | $ | 733 |  |  | $ | — |  |  | $ | 692 |
Trojan decommissioning activities (1) | — |  |  | 41 |  |  | — |  |  | — |
Asset retirement obligations | — |  |  | 39 |  |  | — |  |  | 39 |
Other | 4 |  |  | 39 |  |  | 12 |  |  | 34 |
Total regulatory liabilities | $ | 4 |  | (2) | $ | 852 |  |  | $ | 12 |  | (1) | $ | 765 |
(1) | During the third quarter of 2013, PGE received a settlement for the reimbursement of certain monitoring costs incurred related to spent nuclear fuel at the Company’s Trojan nuclear power plant. See Complaint Against U.S. Department of Energy in Note 7, Contingencies, for additional information.
(2) | 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, 2013 |  | December 31, 2012
Accrued employee compensation and benefits | $ | 44 |  |  | $ | 46 |
Accrued interest payable | 33 |  |  | 23 |
Accrued taxes payable | 35 |  |  | 21 |
Accrued dividends payable | 22 |  |  | 21 |
Regulatory liabilities—current | 4 |  |  | 12 |
Other | 54 |  |  | 56 |
Total accrued expenses and other current liabilities | $ | 192 |  |  | $ | 179 |
Pension and Other Postretirement Benefits Disclosure [Text Block] | Components of net periodic benefit cost are as follows (in millions):
| Three Months Ended September 30,
| Defined Benefit Pension Plan |  | Other Postretirement Benefits |  | Non-Qualified Benefit Plans
| 2013 |  | 2012 |  | 2013 |  | 2012 |  | 2013 |  | 2012
Service cost | $ | 4 |  |  | $ | 3 |  |  | $ | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost | 7 |  |  | 8 |  |  | 1 |  |  | 1 |  |  | — |  |  | — |
Expected return on plan assets | (10 | ) |  | (10 | ) |  | — |  |  | — |  |  | — |  |  | — |
Amortization of prior service cost | — |  |  | — |  |  | — |  |  | 1 |  |  | — |  |  | — |
Amortization of net actuarial loss | 6 |  |  | 4 |  |  | — |  |  | — |  |  | — |  |  | — |
Net periodic benefit cost | $ | 7 |  |  | $ | 5 |  |  | $ | 2 |  |  | $ | 2 |  |  | $ | — |  |  | $ | — |
| Nine Months Ended September 30,
| Defined Benefit Pension Plan |  | Other Postretirement Benefits |  | Non-Qualified Benefit Plans
| 2013 |  | 2012 |  | 2013 |  | 2012 |  | 2013 |  | 2012
Service cost | $ | 12 |  |  | $ | 9 |  |  | $ | 2 |  |  | $ | 1 |  |  | $ | — |  |  | $ | — |
Interest cost | 23 |  |  | 24 |  |  | 3 |  |  | 3 |  |  | 1 |  |  | 1 |
Expected return on plan assets | (30 | ) |  | (30 | ) |  | (1 | ) |  | — |  |  | — |  |  | — |
Amortization of prior service cost | — |  |  | — |  |  | 1 |  |  | 1 |  |  | — |  |  | — |
Amortization of net actuarial loss | 18 |  |  | 12 |  |  | — |  |  | — |  |  | — |  |  | — |
Net periodic benefit cost | $ | 23 |  |  | $ | 15 |  |  | $ | 5 |  |  | $ | 5 |  |  | $ | 1 |  |  | $ | 1 |

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