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Revenues - Narrative (Details)
$ in Billions
9 Months Ended
Sep. 30, 2022
USD ($)
Disaggregation of Revenue [Line Items]  
Revenue, remaining performance obligation, amount $ 3.5
ASUS  
Disaggregation of Revenue [Line Items]  
Period of fixed price contracts to operate and maintain water systems at various military bases 50 years
ASUS | Minimum  
Disaggregation of Revenue [Line Items]  
Revenue, remaining performance obligation, expected timing of satisfaction, period 32 years
ASUS | Maximum  
Disaggregation of Revenue [Line Items]  
Revenue, remaining performance obligation, expected timing of satisfaction, period 46 years
Contracted services: | ASUS  
Disaggregation of Revenue [Line Items]  
Period of fixed price contracts to operate and maintain water systems at various military bases 50 years
Electric: | Golden State Water Company and Bear Valley Electric Service Inc. | Sales | Customer Concentration Risk  
Disaggregation of Revenue [Line Items]  
Concentration risk, percentage 90.00%
Water: | GSWC | Sales | Customer Concentration Risk  
Disaggregation of Revenue [Line Items]  
Concentration risk, percentage 90.00%