Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
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Name:	us-gaap_ShortTermBorrowings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Debt Short-term Debt - USD ($) $ in Thousands	9 Months Ended
Debt Short-term Debt - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Short-term Debt [Line Items]
Short-term debt	$ 141,000	$ 389,500	$ 399,500
Commercial Paper Maximum Maturity	18 days
Commercial Paper Average Maturity	9 days
Northwest Natural Gas Company [Member]
Short-term Debt [Line Items]
Short-term debt	$ 53,000	$ 245,500	$ 370,500
Line of Credit [Member]
Short-term Debt [Line Items]
Short-term debt	$ 88,000
Debt, Weighted Average Interest Rate	4.70%
Commercial Paper [Member] \| Northwest Natural Gas Company [Member]
Short-term Debt [Line Items]
Short-term debt	$ 53,000
Debt, Weighted Average Interest Rate	3.30%