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Commitments and Contingencies - Schedule of Estimated Accrued Costs (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
CenterPoint Energy  
Loss Contingencies [Line Items]  
Amount accrued for remediation $ 13
CenterPoint Energy | Minimum  
Loss Contingencies [Line Items]  
Estimated remediation costs $ 8
Years to resolve contingency 5 years
CenterPoint Energy | Maximum  
Loss Contingencies [Line Items]  
Estimated remediation costs $ 47
Years to resolve contingency 50 years
CERC | CERC  
Loss Contingencies [Line Items]  
Amount accrued for remediation $ 11
CERC | CERC | Minimum  
Loss Contingencies [Line Items]  
Estimated remediation costs $ 7
Years to resolve contingency 5 years
CERC | CERC | Maximum  
Loss Contingencies [Line Items]  
Estimated remediation costs $ 40
Years to resolve contingency 50 years