XML 109 R93.htm IDEA: XBRL DOCUMENT v3.20.4

Commitments (Details)	12 Months Ended
	Dec. 31, 2020
Renewables Portfolio Standard [Member] | Bear Valley Electric Service, Inc.
Purchase commitments
Derivative, Term of Contract	ten

X

- Definition

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

+ References

No definition available.

+ Details

Name:	awr_PeriodofAgreementforPurchaseofRenewableEnergyCredits
Namespace Prefix:	awr_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_PurchaseCommitmentExcludingLongtermCommitmentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RegulatoryAssetAxis=awr_RenewablesPortfolioStandardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=awr_BearValleyElectricServiceIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: