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Long-term Debt Schedule of Long Term Debt Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
First mortgage Bonds - minimum rate | 2.51% |  |
First Mortgage Bonds, rates range from 2.51% to 9.31%, with a weighted average rate of 4.63% in 2019 and 5.01% in 2018, due at various dates through 2050 | $ 2,510 |  | $ 2,390
Pollution Control Revenue Bonds, 5% rate, due 2033 | 119 |  | 119
Pollution Control Revenue Bonds owned by PGE | (21) |  | (21)
Total long-term debt | 2,608 |  | 2,488
Debt Instrument, Unamortized Discount | (11) |  | (10)
Less: current portion of long-term debt | 0 | $ (50) | (300)
Long-term debt, net of current portion | $ 2,597 |  | $ 2,178
First Mortgage Bonds - maximum rate | 9.31% |  |
Debt, Weighted Average Interest Rate | 4.63% |  |

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- Definition Represents the current and noncurrent portions of a debt security issued by a state, certain agencies or authorities, a local government, or development corporation to finance the construction of air- or water-pollution control facilities or sewage or solid waste disposal facilities pursuant to federal law. The bonds are backed by the credit of the beneficiary of the financing rather than the credit of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20,22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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