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Price Risk Management (Tables) | 3 Months Ended
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Mar. 31, 2015
Derivative [Line Items] |
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):
| March 31, 2015 |  | December 31, 2014 |
Current assets: |  |  |  |
Commodity contracts: |  |  |  |
Electricity | $ | 5 |  |  | $ | 4 |  |
Natural gas | 2 |  |  | 2 |  |
Total current derivative assets | 7 |  | (1) | 6 |  | (1)
Noncurrent assets: |  |  |  |
Commodity contracts: |  |  |  |
Electricity | 2 |  |  | 1 |  |
Total noncurrent derivative assets | 2 |  | (2) | 1 |  | (2)
Total derivative assets not designated as hedging instruments | $ | 9 |  |  | $ | 7 |  |
Total derivative assets | $ | 9 |  |  | $ | 7 |  |
Current liabilities: |  |  |  |
Commodity contracts: |  |  |  |
Electricity | $ | 47 |  |  | $ | 54 |  |
Natural gas | 60 |  |  | 52 |  |
Total current derivative liabilities | 107 |  |  | 106 |  |
Noncurrent liabilities: |  |  |  |
Commodity contracts: |  |  |  |
Electricity | 91 |  |  | 58 |  |
Natural gas | 85 |  |  | 64 |  |
Total noncurrent derivative liabilities | 176 |  |  | 122 |  |
Total derivative liabilities not designated as hedging instruments | $ | 283 |  |  | $ | 228 |  |
Total derivative liabilities | $ | 283 |  |  | $ | 228 |  |
(1) | Included in Other current assets on the condensed consolidated balance sheets.
(2) | Included in Other noncurrent assets on the condensed 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 through 2035, were as follows (in millions):
| March 31, 2015 |  | December 31, 2014
Commodity contracts: |  |  |  |  |
Electricity | 15 |  | MWh |  | 16 |  | MWh
Natural gas | 126 |  | Decatherms |  | 127 |  | Decatherms
Foreign currency | $ | 7 |  | Canadian |  | $ | 7 |  | Canadian
Price Risk Management Assets and Liabilities Subject to Master Netting Agreements [Table Text Block] | Price risk management liabilities subject to master netting agreements is as follows (in millions):
|  |  |  |  |  |  | Gross Amounts Not Offset in |  |
| Gross Amounts Recognized |  | Gross Amounts Offset |  | Net Amounts Presented |  | Condensed Consolidated |  |
|  |  |  | Balance Sheets |  | Net Amount
|  |  |  | Derivatives |  | Cash Collateral(1) |
As of March 31, 2015: |  |  |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Commodity contracts: |  |  |  |  |  |  |  |  |  |  |
Electricity(2) | $ | 91 |  |  | $ | — |  |  | $ | 91 |  |  | $ | (91 | ) |  | $ | — |  |  | $ | — |
Natural gas(2) | 16 |  |  | — |  |  | 16 |  |  | (16 | ) |  | — |  |  | — |
| $ | 107 |  |  | $ | — |  |  | $ | 107 |  |  | $ | (107 | ) |  | $ | — |  |  | $ | — |
As of December 31, 2014: |  |  |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Commodity contracts: |  |  |  |  |  |  |  |  |  |  |
Electricity(2) | $ | 55 |  |  | $ | — |  |  | $ | 55 |  |  | $ | (55 | ) |  | $ | — |  |  | $ | — |
Natural gas(2) | 17 |  |  | — |  |  | 17 |  |  | (17 | ) |  | — |  |  | — |
| $ | 72 |  |  | $ | — |  |  | $ | 72 |  |  | $ | (72 | ) |  | $ | — |  |  | $ | — |
(1) | As of March 31, 2015 and December 31, 2014, PGE had posted collateral in the amount of $15 million and $11 million, respectively, which consisted entirely of letters of credit.
(2) | Included in Liabilities from price risk management activities—current and Liabilities from price risk management activities—noncurrent.
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 recorded in Purchased power and fuel in the condensed consolidated statements of income and were as follows (in millions):
| Three Months Ended March 31,
| 2015 |  | 2014
Commodity contracts: |  |  |
Electricity | $ | 41 |  |  | $ | 9 |
Natural Gas | 44 |  |  | (36 | )
Net unrealized and certain net realized losses (gains) presented in the preceding table are offset within the condensed consolidated statements of income by the effects of regulatory accounting.
Schedule of Price Risk Derivatives [Table Text Block] | Assuming no changes in market prices and interest rates, the following table indicates the year in which the net unrealized loss recorded as of March 31, 2015 related to PGE’s derivative activities would become realized as a result of the settlement of the underlying derivative instrument (in millions):
| 2015 |  | 2016 |  | 2017 |  | 2018 |  | 2019 |  | Thereafter |  | Total
Commodity contracts: |  |  |  |  |  |  |  |  |  |  |  |  |
Electricity | $ | 35 |  |  | $ | 22 |  |  | $ | 6 |  |  | $ | 6 |  |  | $ | 6 |  |  | $ | 56 |  |  | $ | 131 |
Natural gas | 43 |  |  | 64 |  |  | 30 |  |  | 6 |  |  | — |  |  | — |  |  | 143 |
Net unrealized loss | $ | 78 |  |  | $ | 86 |  |  | $ | 36 |  |  | $ | 12 |  |  | $ | 6 |  |  | $ | 56 |  |  | $ | 274 |
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:
| March 31, 2015 |  | December 31, 2014
Assets from price risk management activities: |  |  |
Counterparty A | 67 | % |  | 63 | %
Counterparty B | 8 |  |  | 14 |
| 75 | % |  | 77 | %
Liabilities from price risk management activities: |  |  |
Counterparty C | 31 | % |  | 22 | %
Counterparty D | 9 |  |  | 12 |
| 40 | % |  | 34 | %

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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 8 -URI http://asc.fasb.org/extlink&oid=35706170&loc=d3e41678-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 Reference 3: 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=35706170&loc=d3e41620-113959 Reference 4: 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=35706170&loc=SL5579245-113959 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=35706170&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 1 -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579240-113959 Reference 7: 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=35706170&loc=d3e41641-113959 Reference 8: 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=35706170&loc=d3e41638-113959 Reference 9: 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=35706170&loc=SL5624171-113959 Reference 10: 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=35706170&loc=SL5624163-113959 Reference 11: 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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