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v3.20.4

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

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- 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

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- 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

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

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