XML 41 R28.htm IDEA: XBRL DOCUMENT v3.19.2
Revenue from Contract with Customers - Additional Information (Details)
$ in Billions
6 Months Ended
Jun. 30, 2019
USD ($)
Disaggregation of Revenue [Line Items]  
Revenue, remaining performance obligation $ 3.2
ASUS | Contracted Services  
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, explanation P35Y
ASUS | Maximum  
Disaggregation of Revenue [Line Items]  
Revenue, remaining performance obligation, expected timing of satisfaction, explanation P49Y
Sales | GOLDEN STATE WATER COMPANY | Water Service Utility Operations [Member]  
Disaggregation of Revenue [Line Items]  
Concentration Risk, Percentage 90.00%
Sales | GOLDEN STATE WATER COMPANY | Electric Service Utility Operations  
Disaggregation of Revenue [Line Items]  
Concentration Risk, Percentage 85.00%