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Regulatory Matters 2 (Details) - USD ($)	1 Months Ended		12 Months Ended
	Oct. 31, 2005	Jul. 31, 2005	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Regulatory matters:
Water			$ 347,112,000	$ 330,637,000	$ 319,830,000
Total			(22,796,000)	16,539,000
Excess deferred income taxes
Regulatory matters:
Total			(77,000,000)
Flow-through taxes, net
Regulatory matters:
Total			(6,300,000)
WRAM
Regulatory matters:
Regulatory adjustment			7,100,000
GSWC
Regulatory matters:
Water			347,112,000	330,637,000	$ 319,830,000
Total			(24,082,000)	12,373,000
GSWC | Excess deferred income taxes
Regulatory matters:
Total			(73,000,000)	(74,185,000)
GSWC | Costs deferred for future recovery on Aerojet case
Regulatory matters:
Regulatory Asset Recovery Periods		20 years
Total			5,210,000	6,751,000
GSWC | Costs deferred for future recovery on Aerojet case | Maximum
Regulatory matters:
Regulatory Asset Recovery Periods	20 years
GSWC | Flow-through taxes, net
Regulatory matters:
Total			$ (5,552,000)	(9,722,000)
GSWC | WRAM, net of MCBA
Regulatory matters:
Commercial paper, term			90 days
Amount billed to customers as surcharges			$ 7,500,000
Total			$ 13,326,000	13,741,000
GSWC | WRAM, net of MCBA | Maximum
Regulatory matters:
Regulatory Asset Recovery Periods			24 months
GSWC | WRAM
Regulatory matters:
Deferred Revenues			$ 0
Total			(3,800,000)
GSWC | Modified Cost Balancing Account
Regulatory matters:
Total			17,100,000
GSWC | Pension Costs and Other Postretirement Benefit Costs
Regulatory matters:
Total			25,212,000	65,576,000
Various refunds to customers | GSWC
Regulatory matters:
Total			$ (2,680,000)	$ (4,577,000)

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
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-Paragraph 28
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