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Background and Basis of Presentation (Details)
Mar. 31, 2022
registrant
publicUtilityCompany
state
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]  
Number of registrants | registrant 3
CERC Corp | Natural Gas  
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]  
Number of states in which entity operates | state 4
Vectren  
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]  
Number of owned and operated utility companies | publicUtilityCompany 3