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Contingencies (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($) item
Contingencies |
Environmental Loss Contingency Statement OfFinancial Position Extensible Enumeration Not Disclosed Flag | estimated remaining cost
Contracted services: | Maximum |
Contingencies |
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases | 50 years
American States Utility Services | Contracted services: | Maximum |
Contingencies |
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases | 50 years
Environmental Clean-Up and Remediation | GSWC |
Contingencies |
Number of Plant Sites | item | 1
Amount paid by the State of California Underground Storage Tank Fund for clean-up and remediation of plant facilities | $ 1.5
Environmental Costs Recognized, Capitalized | 6.3
Accrued liability for the estimated additional cost to complete the clean-up at the site | $ 1.3

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