Equity	3 Months Ended
	Mar. 31, 2022
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 quarter ended March 31, 2022, NW Holdings issued and sold 195,901 shares of common stock pursuant to the ATM equity program resulting in cash proceeds of $10.1 million, net of fees and commissions paid to agents of $0.3 million. As of March 31, 2022, NW Holdings had issued and sold 571,621 shares of common stock pursuant to the ATM equity program resulting in cash proceeds of $27.6 million, net of fees and commissions paid to agents of $0.7 million. The ATM equity program was initiated to raise funds for general corporate purposes, including for NW Holdings’ subsidiaries, that are reflected as equity transfers on occurrence. Contributions received by NW Natural may also be used, in part, to repay short-term indebtedness.