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Price Risk Management (Tables) | 9 Months Ended
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Sep. 30, 2013
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):
| September 30, 2013 |  | December 31, 2012 |
Current assets: |  |  |  |
Commodity contracts: |  |  |  |
Electricity | $ | — |  |  | $ | 1 |  |
Natural gas | 1 |  |  | 3 |  |
Total current derivative assets | 1 |  | (1) | 4 |  | (1)
Noncurrent assets: |  |  |  |
Commodity contracts—Natural gas | — |  | (2) | 2 |  | (2)
Total derivative assets not designated as hedging instruments | $ | 1 |  |  | $ | 6 |  |
Total derivative assets | $ | 1 |  |  | $ | 6 |  |
Current liabilities: |  |  |  |
Commodity contracts: |  |  |  |
Electricity | $ | 42 |  |  | $ | 44 |  |
Natural gas | 47 |  |  | 83 |  |
Total current derivative liabilities | 89 |  |  | 127 |  |
Noncurrent liabilities: |  |  |  |
Commodity contracts: |  |  |  |
Electricity | 36 |  |  | 38 |  |
Natural gas | 35 |  |  | 35 |  |
Total noncurrent derivative liabilities | 71 |  |  | 73 |  |
Total derivative liabilities not designated as hedging instruments | $ | 160 |  |  | $ | 200 |  |
Total derivative liabilities | $ | 160 |  |  | $ | 200 |  |
(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 2017, were as follows (in millions):
| September 30, 2013 |  | December 31, 2012
Commodity contracts: |  |  |  |  |
Electricity | 12 |  | MWh |  | 11 |  | MWh
Natural gas | 104 |  | Decatherms |  | 86 |  | Decatherms
Oil | (1 | ) | Gallons |  | — |  | Gallons
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 |  | Gross |  | Net |  | Condensed Consolidated |  |
|  | Amounts |  | Amounts |  | Amounts |  | Balance Sheets |  |
|  | Recognized |  | Offset |  | Presented |  | Derivatives |  | Cash Collateral(1) |  | Net Amount
As of September 30, 2013: |  |  |  |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts: |  |  |  |  |  |  |  |  |  |  |  |
Electricity(2) |  | $ | 14 |  |  | $ | — |  |  | $ | 14 |  |  | $ | (14 | ) |  | $ | — |  |  | $ | — |
Natural gas(2) |  | 3 |  |  | — |  |  | 3 |  |  | (3 | ) |  | — |  |  | — |
|  | $ | 17 |  |  | $ | — |  |  | $ | 17 |  |  | $ | (17 | ) |  | $ | — |  |  | $ | — |
As of December 31, 2012: |  |  |  |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts: |  |  |  |  |  |  |  |  |  |  |  |
Electricity(2) |  | $ | 20 |  |  | $ | — |  |  | $ | 20 |  |  | $ | (20 | ) |  | $ | — |  |  | $ | — |
Natural gas(2) |  | 7 |  |  | — |  |  | 7 |  |  | (7 | ) |  | — |  |  | — |
|  | $ | 27 |  |  | $ | — |  |  | $ | 27 |  |  | $ | (27 | ) |  | $ | — |  |  | $ | — |
(1) | As of September 30, 2013 and December 31, 2012, the Company had collateral posted of $6 million and $18 million, respectively, which consists 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 (gains) losses 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 September 30, |  | Nine Months Ended September 30,
| 2013 |  | 2012 |  | 2013 |  | 2012
Commodity contracts: |  |  |  |  |  |  |
Electricity | $ | (1 | ) |  | $ | (3 | ) |  | $ | 17 |  |  | $ | 40 |
Natural Gas | 10 |  |  | (19 | ) |  | 30 |  |  | 6 |
Net unrealized and certain net realized (gains) losses presented in the table above 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 September 30, 2013 related to PGE’s derivative activities would become realized as a result of the settlement of the underlying derivative instrument (in millions):
| 2013 |  | 2014 |  | 2015 |  | 2016 |  | 2017 |  | Total
Commodity contracts: |  |  |  |  |  |  |  |  |  |  |
Electricity | $ | 8 |  |  | $ | 40 |  |  | $ | 23 |  |  | $ | 7 |  |  | $ | — |  |  | $ | 78 |
Natural gas | 21 |  |  | 34 |  |  | 11 |  |  | 11 |  |  | 4 |  |  | 81 |
Net unrealized loss | $ | 29 |  |  | $ | 74 |  |  | $ | 34 |  |  | $ | 18 |  |  | $ | 4 |  |  | $ | 159 |
Schedule of Concentration of Risk, by Counterparty [Table Text Block] | Counterparties representing 10% or more of Assets and Liabilities from price risk management activities as of September 30, 2013 or December 31, 2012 were as follows:
| September 30, 2013 |  | December 31, 2012
Assets from price risk management activities: |  |  |
Counterparty A | 21 | % |  | — | %
Counterparty B | 14 |  |  | — |
Counterparty C | 11 |  |  | — |
Counterparty D | 9 |  |  | 21 |
Counterparty E | 4 |  |  | 11 |
Counterparty F | 1 |  |  | 13 |
Counterparty G | — |  |  | 10 |
| 60 | % |  | 55 | %
Liabilities from price risk management activities: |  |  |
Counterparty H | 16 | % |  | — | %
Counterparty I | 14 |  |  | 24 |
Counterparty A | 10 |  |  | 14 |
Counterparty E | 10 |  |  | 8 |
Counterparty J | 9 |  |  | 10 |
| 59 | % |  | 56 | %

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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 25 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 Reference 2: 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=7476318&loc=d3e41678-113959 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=7476318&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=7476318&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=7476318&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=7476318&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=7476318&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=7476318&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=7476318&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=7476318&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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