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Price Risk Management (Tables) | 12 Months Ended
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Dec. 31, 2017
Price Risk Management [Abstract] |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] | PGE’s Assets and Liabilities from price risk management activities consist of the following (in millions):
| As of December 31, |
| 2017 |  | 2016 |
Current assets: |  |  |  |
Commodity contracts: |  |  |  |
Electricity | $ | 3 |  |  | $ | 6 |  |
Natural gas | 3 |  |  | 12 |  |
Total current derivative assets | 6 |  | (1) | 18 |  | (1)
Noncurrent assets: |  |  |  |
Commodity contracts: |  |  |  |
Electricity | — |  |  | 1 |  |
Natural gas | — |  |  | 4 |  |
Total noncurrent derivative assets | — |  | (2) | 5 |  | (2)
Total derivative assets not designated as hedging instruments | $ | 6 |  |  | $ | 23 |  |
Total derivative assets | $ | 6 |  |  | $ | 23 |  |
Current liabilities: |  |  |  |
Commodity contracts: |  |  |  |
Electricity | $ | 13 |  |  | $ | 12 |  |
Natural gas | 46 |  |  | 32 |  |
Total current derivative liabilities | 59 |  |  | 44 |  |
Noncurrent liabilities: |  |  |  |
Commodity contracts: |  |  |  |
Electricity | 122 |  |  | 106 |  |
Natural gas | 29 |  |  | 19 |  |
Total noncurrent derivative liabilities | 151 |  |  | 125 |  |
Total derivative liabilities not designated as hedging instruments | $ | 210 |  |  | $ | 169 |  |
Total derivative liabilities | $ | 210 |  |  | $ | 169 |  |
(1) | Included in Other current assets on the consolidated balance sheets.
(2) | Included in Other noncurrent assets on the consolidated balance sheets.
Schedule of Derivative Instruments [Table Text Block] | PGE’s net volumes related to its Assets and Liabilities from price risk management activities resulting from its derivative transactions, which are expected to deliver or settle at various dates through 2035, were as follows (in millions):
| As of December 31,
| 2017 |  | 2016
Commodity contracts: |  |  |  |  |  |  |
Electricity | 7 |  |  | MWh |  | 8 |  |  | MWh
Natural gas | 114 |  |  | Dth |  | 107 |  |  | Dth
Foreign currency exchange | $ | 21 |  |  | Canadian |  | $ | 22 |  |  | Canadian
Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] | Net realized and unrealized losses (gains) on derivative transactions not designated as hedging instruments are classified in Purchased power and fuel in the consolidated statements of income and were as follows (in millions):
| Years Ended December 31,
| 2017 |  | 2016 |  | 2015
Commodity contracts: |  |  |  |  |
Electricity | $ | 41 |  |  | $ | 34 |  |  | $ | 72 |
Natural Gas | 85 |  |  | (56 | ) |  | 103 |
Foreign currency exchange | (1 | ) |  | — |  |  | 1 |
Net unrealized and certain net realized losses (gains) presented in the table above are offset within the consolidated statements of income by the effects of regulatory accounting. Net losses of $82 million, net gains of $13 million, and net losses of $160 million for the years ended December 31, 2017, 2016, and 2015, respectively, have been offset in Net income.
Schedule of Price Risk Derivatives [Table Text Block] | Assuming no changes in market prices and interest rates, the following table presents the year in which the net unrealized loss recorded as of December 31, 2017 related to PGE’s derivative activities would be realized as a result of the settlement of the underlying derivative instrument (in millions):
| 2018 |  | 2019 |  | 2020 |  | 2021 |  | 2022 |  | Thereafter |  | Total
Commodity contracts: |  |  |  |  |  |  |  |  |  |  |  |  |
Electricity | $ | 10 |  |  | $ | 8 |  |  | $ | 8 |  |  | $ | 8 |  |  | $ | 7 |  |  | $ | 91 |  |  | $ | 132 |
Natural gas | 43 |  |  | 20 |  |  | 7 |  |  | 2 |  |  | — |  |  | — |  |  | 72 |
Net unrealized loss | $ | 53 |  |  | $ | 28 |  |  | $ | 15 |  |  | $ | 10 |  |  | $ | 7 |  |  | $ | 91 |  |  | $ | 204 |
Schedule of Concentration of Risk, by Counterparty [Table Text Block] | Counterparties representing 10% or more of Assets and Liabilities from price risk management activities were as follows:
| As of December 31,
| 2017 |  | 2016
Assets from price risk management activities: |  |  |
Counterparty A | 39 | % |  | 22 | %
Counterparty B | 12 |  |  | 17 |
Counterparty C | 3 |  |  | 12 |
| 54 | % |  | 51 | %
Liabilities from price risk management activities: |  |  |
Counterparty D | 62 | % |  | 66 | %
| 62 | % |  | 66 | %

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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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- Definition Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41641-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41678-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41638-113959 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579240-113959 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41620-113959 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(n)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Tabular disclosure for other derivative instruments not designated as hedging instruments of (a) the location and amount of gains and losses reported in the statement of financial performance and (b) the location and fair value amounts of the instruments reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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