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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

X

- Definition

First Mortgage Bonds - maximum rate

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- Definition

First mortgage Bonds - minimum rate

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- Definition

Pollution Control Revenue Bonds owned by PGE

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- Definition

Remarketable Pollution Control Bonds held by the Company.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Weighted average interest rate of debt outstanding.

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- Definition

The effective interest rate at the end of the reporting period.

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The effective interest rate during the reporting period.

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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.

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-Topic 230
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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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