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Price Risk Management (Tables) | 3 Months Ended
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Mar. 31, 2012
Derivative [Line Items] |
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 2016, were as follows (in millions):
| March 31, 2012 |  | December 31, 2011
Commodity contracts: |  |  |  |  |
Electricity | 12 |  | MWh |  | 13 |  | MWh
Natural gas | 71 |  | Decatherms |  | 79 |  | Decatherms
Foreign currency | $ | 7 |  | Canadian |  | $ | 6 |  | Canadian
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] | The fair value of PGE’s Assets and Liabilities from price risk management activities consists of the following (in millions):
| March 31, 2012 |  | December 31, 2011 |
Current assets: |  |  |  |
Commodity contracts: |  |  |  |
Electricity | $ | 7 |  |  | $ | 2 |  |
Natural gas | 18 |  |  | 17 |  |
Total current derivative assets | 25 |  | (1) | 19 |  | (1)
Total derivative assets not designated as hedging instruments | $ | 25 |  |  | $ | 19 |  |
Total derivative assets | $ | 25 |  |  | $ | 19 |  |
Current liabilities: |  |  |  |
Commodity contracts: |  |  |  |
Electricity | $ | 90 |  |  | $ | 66 |  |
Natural gas | 152 |  |  | 150 |  |
Total current derivative liabilities | 242 |  |  | 216 |  |
Noncurrent liabilities: |  |  |  |
Commodity contracts: |  |  |  |
Electricity | 76 |  |  | 71 |  |
Natural gas | 97 |  |  | 101 |  |
Total noncurrent derivative liabilities | 173 |  |  | 172 |  |
Total derivative liabilities not designated as hedging instruments | $ | 415 |  |  | $ | 388 |  |
Total derivative liabilities | $ | 415 |  |  | $ | 388 |  |
(1) | Included in Other current assets on the condensed consolidated balance sheets.
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 condensed consolidated statements of income and were as follows (in millions):
| Three Months Ended March 31,
| 2012 |  | 2011
Commodity contracts: |  |  |
Electricity | $ | 53 |  |  | $ | 31 |
Natural Gas | 36 |  |  | (6 | )
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, 2012 related to PGE’s derivative activities would become realized as a result of the settlement of the underlying derivative instrument (in millions):
| 2012 |  | 2013 |  | 2014 |  | 2015 |  | Total
Commodity contracts: |  |  |  |  |  |  |  |  |
Electricity | $ | 63 |  |  | $ | 60 |  |  | $ | 25 |  |  | $ | 11 |  |  | $ | 159 |
Natural gas | 111 |  |  | 83 |  |  | 30 |  |  | 7 |  |  | 231 |
Net unrealized loss | $ | 174 |  |  | $ | 143 |  |  | $ | 55 |  |  | $ | 18 |  |  | $ | 390 |
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 March 31, 2012 or December 31, 2011 were as follows:
| March 31, 2012 |  | December 31, 2011
Assets from price risk management activities: |  |  |
Counterparty A | 16 | % |  | 16 | %
Counterparty B | 12 |  |  | 19 |
Counterparty C | 11 |  |  | 7 |
Counterparty D | 8 |  |  | 13 |
| 47 | % |  | 55 | %
Liabilities from price risk management activities: |  |  |
Counterparty C | 22 | % |  | 23 | %
Counterparty E | 13 |  |  | 10 |
| 35 | % |  | 33 | %

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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=6935481&loc=SL5624163-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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 1B -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5580258-113959 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 4B -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959 Reference 4: 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=6935481&loc=d3e41620-113959 Reference 5: 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=6935481&loc=SL5624171-113959 Reference 6: 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=6935481&loc=d3e41641-113959 Reference 7: 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=6935481&loc=SL5579245-113959 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=6935481&loc=SL5579240-113959 Reference 9: 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=6881521&loc=d3e23780-122690 Reference 10: 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=6935481&loc=d3e41678-113959 Reference 11: 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=6935481&loc=d3e41638-113959 + Details
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