Earnings Per Share and Capital Stock 2 (Details) - USD ($)	1 Months Ended	12 Months Ended
	Jan. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Capital stock
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic			$ (110,000)	$ (131,000)
Additional disclosure
Proceeds from Stock Options Exercised, Distributed to Subsidiaries		$ 0	$ 0	$ 0
Dividend Reinvestment Plan Common Stock Capital Shares Reserved for Future Issuance		1,055,948
Common Shares authorized for issuance but unissued under 401(k) Plan		387,300
Common Shares issued as a result of the exercise of stock options		0	0	1,800
Cash proceeds from the exercise of stock options				$ 30,000
Exercise of stock options and other issuance of Common Shares		$ 0	$ 0	$ 30,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		0	0	1,800
Maximum
Additional disclosure
Percentage of target amount of performance shares		200.00%
2000 and 2008 Employee Plans
Additional disclosure
Exercise of stock options and other issuance of Common Shares		25,956	47,182	42,489
Stock Issued During Period, Shares, New Issues		25,956	47,182	42,489
AWR
Additional disclosure
Cash proceeds from the exercise of stock options		$ 0	$ 0	$ 30,000
GSWC
Additional disclosure
Exercise of stock options and other issuance of Common Shares				$ 60,000,000
Intercompany borrowings payment term		24 months
Intercompany borrowings payment term		24 months
GSWC | Subsequent Event
Additional disclosure
Exercise of stock options and other issuance of Common Shares	$ 10,000,000
Common Stock
Additional disclosure
Exercise of stock options and other issuance of Common Shares		26,000	47,000	42,000
Exercise of stock options and other issuance of Common Shares		$ 0	$ 0	$ 30,000
Stock Issued During Period, Shares, New Issues		26,000	47,000	42,000
Common Stock | GSWC
Additional disclosure
Exercise of stock options and other issuance of Common Shares		0	0	5
Exercise of stock options and other issuance of Common Shares				$ 60,000,000
Stock Issued During Period, Shares, New Issues		0	0	5
Common Stock | GSWC | Subsequent Event
Additional disclosure
Exercise of stock options and other issuance of Common Shares	1
Stock Issued During Period, Shares, New Issues	1