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Regulatory Matters 4 (Details) - USD ($)	1 Months Ended		12 Months Ended
	Oct. 31, 2005	Jul. 31, 2005	Dec. 31, 2021	Feb. 02, 2022
GSWC
Regulatory matters:
Approval amount for the relief funding			$ 9,500,000
GSWC | Costs deferred for future recovery on Aerojet case
Regulatory matters:
Increase in Revenue Requirement, Recoverable through Surcharges		$ 21,300,000
Recovery period		20 years
Reimbursement to recover costs			$ 17,500,000
GSWC | Costs deferred for future recovery on Aerojet case | Maximum
Regulatory matters:
Recovery period	20 years
GSWC | Water Revenue Adjustment Mechanism Net of Modified Cost Balancing Account [Member] | Maximum
Regulatory matters:
Recovery period			24 months
GSWC | COVID-19 memorandum account
Regulatory matters:
Approval amount for the relief funding			$ 9,500,000
Bear Valley Electric Service, Inc.
Regulatory matters:
Regulatory Asset Wildfire Mitigation Plans WMP			2,800,000
Regulatory Asset CEMA Storm			$ 455,000
Bear Valley Electric Service, Inc. | Renewables Portfolio Standard [Member]
Regulatory matters:
Derivative, Term of Contract			10 years
Bear Valley Electric Service, Inc. | COVID-19 memorandum account | Subsequent Event
Regulatory matters:
Approval amount for the relief funding				$ 321,000

X

- Definition

Approval amount for the relief funding from the state of California

+ References

No definition available.

+ Details

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Balance Type:	credit
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X

- Definition

Represents the amount of increase in revenue requirement for difference between the allocated general office costs authorized by the CPUC November 2010 Decision and what was then in rates for allocated general office costs.

+ References

No definition available.

+ Details

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X

- Definition

Represents the period of agreement with a third party to purchase renewable energy credits.

+ References

No definition available.

+ Details

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- Definition

Regulatory Asset CEMA Storm

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the recovery periods of the surcharge billed to the customers.

+ References

No definition available.

+ Details

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- Definition

Regulatory Asset Wildfire Mitigation Plans WMP

+ References

No definition available.

+ Details

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Namespace Prefix:	awr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

-- None. No documentation exists for this element. --

+ References

No definition available.

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- Definition

Amount of deferred cost, excluding capitalized cost related to contract with customer; classified as noncurrent.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(17))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(10))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

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- Details

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- Details

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- Details

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- Details

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Namespace Prefix:
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- Details

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