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Long term debt (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |
Proceeds from Issuance of First Mortgage Bond | $ 75 |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.47% |  |
Long-term Pollution Control Bond | $ 21 |  |
First mortgage Bonds - minimum rate | 0.00% |  |
First Mortgage Bonds - maximum rate | 0.00% |  |
Debt, Weighted Average Interest Rate | 0.00% | 5.03% |
Line of Credit Facility, Interest Rate During Period |  | 1.37% |
Line of Credit Facility, Interest Rate at Period End |  | 0.00% |
Pollution Control Revenue Bonds owned by PGE | $ 21 | $ 21 |
Repayments of Long-term Debt | $ 24 | $ 150 | $ 133

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- Definition First mortgage Bonds - minimum rate + References No definition available. + Details
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- Definition Pollution Control Revenue Bonds owned by PGE + References No definition available. + Details
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- Definition Remarketable Pollution Control Bonds held by the Company. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition The cash inflow from amounts received from a long-term debt instrument secured by a first mortgage deed of trust, containing a pledge of real property. The lender has the highest claim on the property in case of default. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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