Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2022	Feb. 16, 2023	Jun. 30, 2022
Document Information [Line Items]
Document Type	10-K
Document Period End Date	Dec. 31, 2022
Entity File Number	1-38681
Document Annual Report	true
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0001733998
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Registrant Name	NORTHWEST NATURAL HOLDING COMPANY
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	Yes
Entity Common Stock, Shares Outstanding		35,539,262
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Entity Public Float			$ 1,825,498,356
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Transition Report	false
Entity Incorporation, State or Country Code	OR
Entity Tax Identification Number	82-4710680
Entity Address, Address Line One	250 S.W. Taylor Street
Entity Address, City or Town	Portland
Entity Address, State or Province	OR
Entity Address, Postal Zip Code	97204
City Area Code	(503)
Local Phone Number	226-4211
Title of 12(b) Security	Common Stock
Trading Symbol	NWN
Security Exchange Name	NYSE
Entity Interactive Data Current	Yes
Entity Shell Company	false
Documents Incorporated by Reference [Text Block]	Portions of Northwest Natural Holding Company's Proxy Statement, to be filed in connection with the 2023 Annual Meeting of Shareholders, are incorporated by reference in Part III.
Northwest Natural Gas Company [Member]
Document Information [Line Items]
Document Type	10-K
Document Period End Date	Dec. 31, 2022
Entity File Number	1-15973
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0000073020
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Registrant Name	NORTHWEST NATURAL GAS COMPANY
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Entity Incorporation, State or Country Code	OR
Entity Tax Identification Number	93-0256722
Entity Address, Address Line One	250 S.W. Taylor Street
Entity Address, City or Town	Portland
Entity Address, State or Province	OR
Entity Address, Postal Zip Code	97204
City Area Code	(503)
Local Phone Number	226-4211
Entity Interactive Data Current	Yes
Entity Shell Company	false