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Long term debt (Details) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Nov. 30, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Aug. 31, 2013 | Apr. 30, 2013
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  | $ 50 | $ 50 | $ 100 | $ 100 | $ 73 |  |
Long-term Pollution Control Bond | 21 |  |  |  | 21 |  |  |  |
Pollution Control Bonds Retired |  |  |  |  | (6) |  |  |  |
Proceeds from Issuance of Long-term Debt | 50 | 105 | 75 | 150 | 380 | 0 | 0 |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.84% | 4.74% | 5.625% | 4.47% | 4.84% |  |  | 4.47% | 4.45%
First mortgage Bonds - minimum rate | 3.46% |  |  |  | 3.46% | 3.46% |  |  |
First Mortgage Bonds - maximum rate | 9.31% |  |  |  | 9.31% | 9.31% |  |  |
Debt, Weighted Average Interest Rate | 5.62% |  |  |  | 5.62% | 5.84% |  |  |
Pollution Control Revenue Bonds owned by PGE | $ 27 |  |  |  | $ 27 | $ 21 |  |  |
Long-term Pollution Control Bond, Rate | 5.00% |  |  |  | 5.00% |  |  |  |

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- Definition First mortgage Bonds - minimum rate + References No definition available. + Details
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- Definition Long-term Pollution Control Bond, Rate + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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