Equity	6 Months Ended
	Jun. 30, 2023
Equity [Abstract]
Stockholders' Equity Note Disclosure	COMMON STOCKIn August 2021, NW Holdings initiated an at-the-market (ATM) equity program by entering into an equity distribution agreement under which NW Holdings may issue and sell from time to time shares of common stock, no par value, having an aggregate gross sales price of up to $200 million. NW Holdings is under no obligation to offer and sell common stock under the ATM equity program, which expires in August 2024. Any shares of common stock offered under the ATM equity program are registered on NW Holdings’ universal shelf registration statement filed with the SEC. During the three months ended June 30, 2023, NW Holdings issued and sold 119,329 shares of common stock pursuant to the ATM equity program resulting in cash proceeds of $5.4 million, net of fees and commissions paid to agents of $0.2 million. During the six months ended June 30, 2023, NW Holdings issued and sold 479,593 shares of common stock pursuant to the ATM equity program resulting in cash proceeds of $22.1 million, net of fees and commissions paid to agents of $0.4 million. As of June 30, 2023, NW Holdings had $88.6 million of equity available for issuance under the program. The ATM equity program was initiated to raise funds for general corporate purposes, including equity contributions to NW Holdings’ subsidiaries, NW Natural and NW Natural Water. We intend that contributions to NW Natural and NW Natural Water will be used for general corporate purposes.