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Employee Benefits (Tables) | 12 Months Ended
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Dec. 31, 2017
Employee Benefits [Abstract] |
Assets and Liabilities associated with Non Qualified Benefit Plans [Table Text Block] | Trust assets and plan liabilities related to the NQBP included in PGE’s consolidated balance sheets are as follows as of December 31 (in millions):
| 2017 |  | 2016
| NQBP |  | Other NQBP |  | Total |  | NQBP |  | Other NQBP |  | Total
Non-qualified benefit plan trust | $ | 17 |  |  | $ | 20 |  |  | $ | 37 |  |  | $ | 16 |  |  | $ | 18 |  |  | $ | 34 |
Non-qualified benefit plan liabilities * | 25 |  |  | 81 |  |  | 106 |  |  | 25 |  |  | 80 |  |  | 105 |
* | For the NQBP, excludes the current portion of $2 million in 2017 and 2016, respectively, which are classified in Other current liabilities in the consolidated balance sheets.
Schedule of Allocation of Plan Assets [Table Text Block] | The asset allocations for the plans, and the target allocation, are as follows:
| As of December 31,
| 2017 |  | 2016
| Actual |  | Target * |  | Actual |  | Target *
Defined Benefit Pension Plan: |  |  |  |  |  |  |
Equity securities | 68 | % |  | 67 | % |  | 68 | % |  | 67 | %
Debt securities | 32 |  |  | 33 |  |  | 32 |  |  | 33 |
Total | 100 | % |  | 100 | % |  | 100 | % |  | 100 | %
Other Postretirement Benefit Plans: |  |  |  |  |  |  |
Equity securities | 63 | % |  | 62 | % |  | 60 | % |  | 62 | %
Debt securities | 37 |  |  | 38 |  |  | 40 |  |  | 38 |
Total | 100 | % |  | 100 | % |  | 100 | % |  | 100 | %
Non-Qualified Benefits Plans: |  |  |  |  |  |  |
Equity securities | 18 | % |  | 12 | % |  | 15 | % |  | 11 | %
Debt securities | 6 |  |  | 12 |  |  | 7 |  |  | 11 |
Insurance contracts | 76 |  |  | 76 |  |  | 78 |  |  | 78 |
Total | 100 | % |  | 100 | % |  | 100 | % |  | 100 | %
* | The target for the Defined Benefit Pension Plan represents the mid-point of the investment target range. Due to the nature of the investment vehicles in both the Other Postretirement Benefit Plans and the NQBP, these targets are the weighted average of the mid-point of the respective investment target ranges approved by the Investment Committee. Due to the method used to calculate the weighted average targets for the Other Postretirement Benefit Plans and NQBP, reported percentages are affected by the fair market values of the investments within the pools.
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] | The Company’s financial assets and liabilities whose values were recognized at fair value are as follows by level within the fair value hierarchy (in millions):
| As of December 31, 2017
| Level 1 |  | Level 2 |  | Level 3 |  | Other(2) |  | Total
Assets: |  |  |  |  |  |  |  |  |
Nuclear decommissioning trust: (1) |  |  |  |  |  |  |  |  |
Debt securities: |  |  |  |  |  |  |  |  |
Domestic government | $ | 4 |  |  | $ | 7 |  |  | $ | — |  |  | $ | — |  |  | $ | 11 |
Corporate credit | — |  |  | 6 |  |  | — |  |  | — |  |  | 6 |
Money market funds measured at NAV (2) | — |  |  | — |  |  | — |  |  | 25 |  |  | 25 |
Non-qualified benefit plan trust: (3) |  |  |  |  |  |  |  |  |
Money market funds | 1 |  |  | — |  |  | — |  |  | — |  |  | 1 |
Equity securities—domestic | 7 |  |  | — |  |  | — |  |  | — |  |  | 7 |
Debt securities—domestic government | 1 |  |  | — |  |  | — |  |  | — |  |  | 1 |
Investments measured at NAV: (2) |  |  |  |  |  |  |  |  |
Collective trust—domestic equity | — |  |  | — |  |  | — |  |  | — |  |  | — |
Assets from price risk management activities: (1) (4) |  |  |  |  |  |  |  |  |
Electricity | — |  |  | 3 |  |  | — |  |  | — |  |  | 3 |
Natural gas | — |  |  | 3 |  |  | — |  |  | — |  |  | 3 |
| $ | 13 |  |  | $ | 19 |  |  | $ | — |  |  | $ | 25 |  |  | $ | 57 |
Liabilities - Liabilities from price risk management activities: (1) (4) |  |  |  |  |  |  |  |  |
Electricity | $ | — |  |  | $ | 5 |  |  | $ | 130 |  |  | $ | — |  |  | $ | 135 |
Natural gas | — |  |  | 66 |  |  | 9 |  |  | — |  |  | 75 |
| $ | — |  |  | $ | 71 |  |  | $ | 139 |  |  | $ | — |  |  | $ | 210 |
(1) | Activities are subject to regulation, with certain gains and losses deferred pursuant to regulatory accounting and included in regulatory assets or regulatory liabilities as appropriate.
(2) | Assets are measured at NAV as a practical expedient and not subject to hierarchy level classification disclosure.
(3) | Excludes insurance policies of $28 million, which are recorded at cash surrender value.
(4) | For further information, see Note 5, Price Risk Management.
| As of December 31, 2016
| Level 1 |  | Level 2 |  | Level 3 |  | Other(2) |  | Total
Assets: |  |  |  |  |  |  |  |  |
Nuclear decommissioning trust: (1) |  |  |  |  |  |  |  |  |
Debt securities: |  |  |  |  |  |  |  |  |
Domestic government | $ | 2 |  |  | $ | 10 |  |  | $ | — |  |  | $ | — |  |  | $ | 12 |
Corporate credit | — |  |  | 8 |  |  | — |  |  | — |  |  | 8 |
Money market funds measured at NAV (2) | — |  |  | — |  |  | — |  |  | 21 |  |  | 21 |
Non-qualified benefit plan trust: (3) |  |  |  |  |  |  |  |  |
Money market funds | 1 |  |  | — |  |  | — |  |  | — |  |  | 1 |
Equity securities—domestic | 4 |  |  | — |  |  | — |  |  | — |  |  | 4 |
Debt securities—domestic government | 1 |  |  | — |  |  | — |  |  | — |  |  | 1 |
Investments measured at NAV: (2) |  |  |  |  |  |  |  |  |
Collective trust—domestic equity | — |  |  | — |  |  | — |  |  | 2 |  |  | 2 |
Assets from price risk management activities: (1) (4) |  |  |  |  |  |  |  |  |
Electricity | — |  |  | 6 |  |  | 1 |  |  | — |  |  | 7 |
Natural gas | — |  |  | 15 |  |  | 1 |  |  | — |  |  | 16 |
| $ | 8 |  |  | $ | 39 |  |  | $ | 2 |  |  | $ | 23 |  |  | $ | 72 |
Liabilities - Liabilities from price risk management activities: (1) (4) |  |  |  |  |  |  |  |  |
Electricity | $ | — |  |  | $ | 6 |  |  | $ | 112 |  |  | $ | — |  |  | $ | 118 |
Natural gas | — |  |  | 42 |  |  | 9 |  |  | — |  |  | 51 |
| $ | — |  |  | $ | 48 |  |  | $ | 121 |  |  | $ | — |  |  | $ | 169 |
(1) | Activities are subject to regulation, with certain gains and losses deferred pursuant to regulatory accounting and included in regulatory assets or regulatory liabilities as appropriate.
(2) | Assets are measured at NAV as a practical expedient and not subject to hierarchy level classification disclosure.
(3) | Excludes insurance policies of $26 million, which are recorded at cash surrender value.
(4) | For further information, see Note 5, Price Risk Management.
The fair values of the Company’s pension plan assets and other postretirement benefit plan assets by asset category are as follows (in millions):
| Level 1 |  | Level 2 |  | Level 3 |  | Other * |  | Total
As of December 31, 2017: |  |  |  |  |  |  |  |  |
Defined Benefit Pension Plan assets: |  |  |  |  |  |  |  |  |
Equity securities—Domestic | $ | 83 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 83 |
Investments measured at NAV: |  |  |  |  |  |  |  |  |
Money market funds | — |  |  | — |  |  | — |  |  | 5 |  |  | 5 |
Collective trust funds | — |  |  | — |  |  | — |  |  | 528 |  |  | 528 |
Private equity funds | — |  |  | — |  |  | — |  |  | 13 |  |  | 13 |
| $ | 83 |  |  | $ | — |  |  | $ | — |  |  | $ | 546 |  |  | $ | 629 |
Other Postretirement Benefit Plans assets: |  |  |  |  |  |  |  |  |
Money market funds | $ | 3 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 3 |
Equity securities: |  |  |  |  |  |  |  |  |
Domestic | — |  |  | 3 |  |  | — |  |  | — |  |  | 3 |
International | 10 |  |  | — |  |  | — |  |  | — |  |  | 10 |
Debt securities—Domestic government | — |  |  | 5 |  |  | — |  |  | — |  |  | 5 |
Investments measured at NAV: |  |  |  |  |  |  |  |  |
Money market funds | — |  |  | — |  |  | — |  |  | 4 |  |  | 4 |
Collective trust funds | — |  |  | — |  |  | — |  |  | 8 |  |  | 8 |
| $ | 13 |  |  | $ | 8 |  |  | $ | — |  |  | $ | 12 |  |  | $ | 33 |
As of December 31, 2016: |  |  |  |  |  |  |  |  |
Defined Benefit Pension Plan assets: |  |  |  |  |  |  |  |  |
Equity securities—Domestic | $ | 52 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 52 |
Investments measured at NAV: |  |  |  |  |  |  |  |  |
Money market funds | — |  |  | — |  |  | — |  |  | 6 |  |  | 6 |
Collective trust funds | — |  |  | — |  |  | — |  |  | 483 |  |  | 483 |
Private equity funds | — |  |  | — |  |  | — |  |  | 18 |  |  | 18 |
| $ | 52 |  |  | $ | — |  |  | $ | — |  |  | $ | 507 |  |  | $ | 559 |
Other Postretirement Benefit Plans assets: |  |  |  |  |  |  |  |  |
Money market funds | $ | 4 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 4 |
Equity securities: |  |  |  |  |  |  |  |  |
Domestic | — |  |  | 3 |  |  | — |  |  | — |  |  | 3 |
International | 8 |  |  | — |  |  | — |  |  | — |  |  | 8 |
Debt securities—Domestic government | — |  |  | 4 |  |  | — |  |  | — |  |  | 4 |
Investments measured at NAV: |  |  |  |  |  |  |  |  |
Money market funds | — |  |  | — |  |  | — |  |  | 4 |  |  | 4 |
Collective trust funds | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 7 |  |  | $ | 7 |
| $ | 12 |  |  | $ | 7 |  |  | $ | — |  |  | $ | 11 |  |  | $ | 30 |
* | Assets are measured at NAV as a practical expedient and not subject to hierarchy level classification disclosure.
Schedule of Defined Benefit Plans Disclosures [Table Text Block] | The following tables provide certain information with respect to the Company’s defined benefit pension plan, other postretirement benefits, and NQBP as of and for the years ended December 31, 2017 and 2016. Information related to the Other NQBP is not included in the following tables (dollars in millions):
| Defined Benefit Pension Plan |  | Other Postretirement Benefits |  |  | Non-Qualified Benefit Plans
| 2017 |  | 2016 |  | 2017 |  |  | 2016 |  |  | 2017 |  | 2016
Benefit obligation: |  |  |  |  |  |  |  |  |  |  |  |  |
As of January 1 | $ | 797 |  |  | $ | 758 |  |  | $ | 73 |  |  |  | $ | 81 |  |  |  | $ | 27 |  |  | $ | 27 |
Service cost | 17 |  |  | 16 |  |  | 2 |  |  |  | 2 |  |  |  | — |  |  | — |
Interest cost | 33 |  |  | 33 |  |  | 3 |  |  |  | 4 |  |  |  | 1 |  |  | 1 |
Participants’ contributions | — |  |  | — |  |  | 2 |  |  |  | 2 |  |  |  | — |  |  | — |
Actuarial loss (gain) | 60 |  |  | 26 |  |  | 3 |  |  |  | (11 | ) |  |  | 1 |  |  | 1 |
Contractual termination benefits | — |  |  | — |  |  | 1 |  |  |  | — |  |  |  | — |  |  | — |
Benefit payments | (36 | ) |  | (34 | ) |  | (6 | ) |  |  | (5 | ) |  |  | (2 | ) |  | (2 | )
Administrative expenses | (2 | ) |  | (2 | ) |  | — |  |  |  | — |  |  |  | — |  |  | — |
As of December 31 | $ | 869 |  |  | $ | 797 |  |  | $ | 78 |  |  |  | $ | 73 |  |  |  | $ | 27 |  |  | $ | 27 |
Fair value of plan assets: |  |  |  |  |  |  |  |  |  |  |  |  |
As of January 1 | $ | 559 |  |  | $ | 550 |  |  | $ | 30 |  |  |  | $ | 30 |  |  |  | $ | 16 |  |  | $ | 15 |
Actual return on plan assets | 106 |  |  | 45 |  |  | 4 |  |  |  | 1 |  |  |  | 1 |  |  | 1 |
Company contributions | 2 |  |  | — |  |  | 3 |  |  |  | 2 |  |  |  | 2 |  |  | 2 |
Participants’ contributions | — |  |  | — |  |  | 2 |  |  |  | 2 |  |  |  | — |  |  | — |
Benefit payments | (36 | ) |  | (34 | ) |  | (6 | ) |  |  | (5 | ) |  |  | (2 | ) |  | (2 | )
Administrative expenses | (2 | ) |  | (2 | ) |  | — |  |  |  | — |  |  |  | — |  |  | — |
As of December 31 | $ | 629 |  |  | $ | 559 |  |  | $ | 33 |  |  |  | $ | 30 |  |  |  | $ | 17 |  |  | $ | 16 |
Unfunded position as of December 31 | $ | (240 | ) |  | $ | (238 | ) |  | $ | (45 | ) |  |  | $ | (43 | ) |  |  | $ | (10 | ) |  | $ | (11 | )
Accumulated benefit plan obligation as of December 31 | $ | 778 |  |  | $ | 714 |  |  | N/A |  |  | N/A |  |  | $ | 27 |  |  | $ | 27 |
Classification in consolidated balance sheet: |  |  |  |  |  |  |  |  |  |  |  |  |
Noncurrent asset | $ | — |  |  | $ | — |  |  | $ | — |  |  |  | $ | — |  |  |  | $ | 17 |  |  | $ | 16 |
Current liability | — |  |  | — |  |  | — |  |  |  | — |  |  |  | (2 | ) |  | (2 | )
Noncurrent liability | (240 | ) |  | (238 | ) |  | (45 | ) |  |  | (43 | ) |  |  | (25 | ) |  | (25 | )
Net liability | $ | (240 | ) |  | $ | (238 | ) |  | $ | (45 | ) |  |  | $ | (43 | ) |  |  | $ | (10 | ) |  | $ | (11 | )
Amounts included in comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |
Net actuarial loss (gain) | $ | (4 | ) |  | $ | 21 |  |  | $ | — |  |  |  | $ | (10 | ) |  |  | $ | 1 |  |  | $ | 1 |
Amortization of net actuarial loss | (13 | ) |  | (14 | ) |  | — |  |  |  | — |  |  |  | (1 | ) |  | (1 | )
Amortization of prior service cost | — |  |  | — |  |  | — |  |  |  | (1 | ) |  |  | — |  |  | — |
| $ | (17 | ) |  | $ | 7 |  |  | $ | — |  |  |  | $ | (11 | ) |  |  | $ | — |  |  | $ | — |
Amounts included in AOCL*: |  |  |  |  |  |  |  |  |  |  |  |  |
Net actuarial loss (gain) | $ | 218 |  |  | $ | 236 |  |  | $ | (1 | ) |  |  | $ | (2 | ) |  |  | $ | 13 |  |  | $ | 13 |
Prior service cost | — |  |  | — |  |  | — |  |  |  | 1 |  |  |  | — |  |  | — |
| $ | 218 |  |  | $ | 236 |  |  | $ | (1 | ) |  |  | $ | (1 | ) |  |  | $ | 13 |  |  | $ | 13 |
| Defined Benefit Pension Plan |  | Other Postretirement Benefits |  |  | Non-Qualified Benefit Plans
| 2017 |  | 2016 |  | 2017 |  |  | 2016 |  |  | 2017 |  | 2016
Assumptions used: |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate for benefit obligation | 3.65 | % |  | 4.17 | % |  | 3.42 | % | - |  | 3.75 | % | - |  | 3.65 | % |  | 4.17 | %
|  |  |  |  | 3.70 | % |  |  | 4.23 | % |  |  |  |  |
Discount rate for benefit cost | 4.17 | % |  | 4.36 | % |  | 3.75 | % | - |  | 3.90 | % | - |  | 4.17 | % |  | 4.36 | %
|  |  |  |  | 4.23 | % |  |  | 4.45 | % |  |  |  |  |
Weighted average rate of compensation increase for benefit obligation | 4.58 | % |  | 3.65 | % |  | 4.58 | % |  |  | 4.58 | % |  |  | N/A |  |  | N/A |
Weighted average rate of compensation increase for benefit cost | 3.65 | % |  | 3.65 | % |  | 4.58 | % |  |  | 4.58 | % |  |  | N/A |  |  | N/A |
Long-term rate of return on plan assets for benefit obligation | 7.50 | % |  | 7.50 | % |  | 6.26 | % |  |  | 6.26 | % |  |  | N/A |  |  | N/A |
Long-term rate of return on plan assets for benefit cost | 7.50 | % |  | 7.50 | % |  | 6.26 | % |  |  | 6.29 | % |  |  | N/A |  |  | N/A |
* Amounts included in AOCL related to the Company’s defined benefit pension plan and other postretirement benefits are transferred to Regulatory assets due to the future recoverability from retail customers. Accordingly, as of the balance sheet date, such amounts are included in Regulatory assets.
Schedule of Net Benefit Costs [Table Text Block] | Net periodic benefit cost consists of the following for the years ended December 31 (in millions):
| Defined Benefit Pension Plan |  | Other Postretirement Benefits |  | Non-Qualified Benefit Plans
| 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015
Service cost | $ | 17 |  |  | $ | 16 |  |  | $ | 18 |  |  | $ | 2 |  |  | $ | 2 |  |  | $ | 2 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost on benefit obligation | 33 |  |  | 33 |  |  | 31 |  |  | 3 |  |  | 4 |  |  | 3 |  |  | 1 |  |  | 1 |  |  | 1 |
Expected return on plan assets | (42 | ) |  | (40 | ) |  | (40 | ) |  | (2 | ) |  | (2 | ) |  | (2 | ) |  | — |  |  | — |  |  | — |
Amortization of prior service cost | — |  |  | — |  |  | — |  |  | — |  |  | 1 |  |  | 1 |  |  | — |  |  | — |  |  | — |
Amortization of net actuarial loss | 13 |  |  | 14 |  |  | 20 |  |  | — |  |  | — |  |  | 1 |  |  | 1 |  |  | 1 |  |  | 1 |
Net periodic benefit cost | $ | 21 |  |  | $ | 23 |  |  | $ | 29 |  |  | $ | 3 |  |  | $ | 5 |  |  | $ | 5 |  |  | $ | 2 |  |  | $ | 2 |  |  | $ | 2 |
Schedule of Expected Benefit Payments [Table Text Block] | The following table summarizes the benefits expected to be paid to participants in each of the next five years and in the aggregate for the five years thereafter (in millions):
| Payments Due
| 2018 |  | 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023 - 2026
Defined benefit pension plan | $ | 39 |  |  | $ | 41 |  |  | $ | 42 |  |  | $ | 43 |  |  | $ | 44 |  |  | $ | 234 |
Other postretirement benefits | 5 |  |  | 5 |  |  | 5 |  |  | 4 |  |  | 5 |  |  | 22 |
Non-qualified benefit plans | 2 |  |  | 3 |  |  | 2 |  |  | 2 |  |  | 2 |  |  | 10 |
Total | $ | 46 |  |  | $ | 49 |  |  | $ | 49 |  |  | $ | 49 |  |  | $ | 51 |  |  | $ | 266 |

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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2439-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=77993564&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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