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Commitments and Guarantees (Tables) | 12 Months Ended
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Dec. 31, 2017
Long-term Purchase Commitment [Line Items] |
Unrecorded Unconditional Purchase Obligations Disclosure [Table Text Block] | As of December 31, 2017, PGE’s estimated future minimum payments pursuant to purchase obligations for the following five years and thereafter are as follows (in millions):
| Payments Due
| 2018 |  | 2019 |  | 2020 |  | 2021 |  | 2022 |  | Thereafter |  | Total
Capital and other purchase commitments | $ | 191 |  |  | $ | 2 |  |  | $ | 10 |  |  | $ | 2 |  |  | $ | 2 |  |  | $ | 58 |  |  | $ | 265 |
Purchased power and fuel: |  |  |  |  |  |  |  |  |  |  |  |  |
Electricity purchases | 156 |  |  | 156 |  |  | 201 |  |  | 200 |  |  | 187 |  |  | 1,733 |  |  | 2,633 |
Capacity contracts | 6 |  |  | 5 |  |  | 4 |  |  | 4 |  |  | 4 |  |  | 8 |  |  | 31 |
Public utility districts | 9 |  |  | 17 |  |  | 16 |  |  | 16 |  |  | 15 |  |  | 85 |  |  | 158 |
Natural gas | 51 |  |  | 35 |  |  | 28 |  |  | 25 |  |  | 24 |  |  | 140 |  |  | 303 |
Coal and transportation | 15 |  |  | 5 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 20 |
Total | $ | 428 |  |  | $ | 220 |  |  | $ | 259 |  |  | $ | 247 |  |  | $ | 232 |  |  | $ | 2,024 |  |  | $ | 3,410 |
Schedule of Long-term Contracts for Purchase of Electric Power [Table Text Block] | PGE has long-term power purchase agreements with certain public utility districts including, Grant County PUD for the Priest Rapids and Wanapum projects, and Douglas County PUD for the Wells project, in the state of Washington. Under the agreements, the Company is required to pay its proportionate share of the operating and debt service costs of the hydroelectric projects whether or not they are operable. In addition, although PGE’s current agreement with Douglas County ends on August 31, 2018, a new contract becomes effective on September 1, 2018 that does not require contributions to Douglas County debt obligation or other costs, including the operation and maintenance costs of the projects. The new contract requires monthly payments for capacity that will not vary with annual project generation provided to PGE. The Company has estimated the capacity payments, which are subject to annual adjustments based on Douglas loads, and included the estimated amounts in the table above. The future minimum payments for the public utility districts in the preceding table reflect the principal and capacity payments only and do not include interest, operation, or maintenance expenses. Selected information regarding these projects is summarized as follows (dollars in millions):
| Revenue Bonds as of December 31, 2017 |  | PGE’s Share as of December 31, 2017 |  | Contract Expiration |  | PGE Cost, including Debt Service
| Output |  | Capacity |  |  | 2017 |  | 2016 |  | 2015
|  |  |  |  | (in MW) |  |  |  |  |  |  |  |
Priest Rapids and Wanapum | $ | 1,269 |  |  | 8.6 | % |  | 163 |  |  | 2052 |  | $ | 16 |  |  | $ | 16 |  |  | $ | 18 |
Wells | 160 |  |  | 19.4 |  |  | 150 |  |  | 2018 |  | 11 |  |  | 10 |  |  | 10 |
Portland Hydro | — |  |  | — |  |  | — |  |  | 2017 |  | 1 |  |  | 1 |  |  | 2 |
Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block] | As of December 31, 2017, PGE’s estimated future minimum lease payments pursuant to capital, build-to-suit, and operating leases for the following five years and thereafter are as follows (in millions):
| Future Minimum Lease Payments
| Capital Leases |  | Build-to-Suit |  | Operating Leases
2018 | $ | 7 |  |  | $ | — |  |  | $ | 9 |
2019 | 6 |  |  | 15 |  |  | 8 |
2020 | 6 |  |  | 15 |  |  | 6 |
2021 | 6 |  |  | 14 |  |  | 6 |
2022 | 5 |  |  | 14 |  |  | 8 |
Thereafter | 72 |  |  | 260 |  |  | 165 |
Total minimum lease payments | $ | 102 |  |  | $ | 318 |  |  | $ | 202 |
Less imputed interest | 51 |  |  |  |  |
Present value of net minimum lease payments | $ | 51 |  |  |  |  |
Less current portion | 2 |  |  |  |  |
Non-current portion | $ | 49 |  |  |  |  |

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- Definition Tabular disclosure of the aggregate amount of payments due on known contractual obligations for the five years following the date of the latest balance sheet and the combined aggregate amount of maturities of known contractual obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 303 -Paragraph a -Subparagraph 5 + Details
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- Definition Tabular disclosure of information concerning the terms and significance of long term contracts to purchase power (generally referred to as purchase power agreements (PPAs) or power sale agreements (PSAs)) including date of contract expiration, share of plant output being purchased, estimated annual cost, annual minimum debt service payment required and amount of related long-term debt or lease obligations outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=77904769&loc=SL2265659-115463 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.D) -URI http://asc.fasb.org/extlink&oid=6499423&loc=d3e659339-123030 + Details
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- Definition Tabular disclosure of unconditional purchase obligations that are not recognized as a liability on the balance sheet, including the nature and significant terms of an unconditional purchase obligation; the amount of the fixed and determinable portion of the obligation as of the date of the latest balance sheet presented in the aggregate and, if determinable, for each of the five succeeding fiscal years; the nature of any variable components of the obligation; the amount purchased under the obligation (for example, the take-or-pay or throughput contract) for the reporting period; and may include the amount of imputed interest necessary to reduce the obligation to present value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25287-109308 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25336-109308 + Details
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