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Short-term Borrowings and Long-term Debt - Schedule of Utilization of Credit Facilities (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2024
Dec. 31, 2023
CERC    
Debt Instrument [Line Items]    
Number of days until commercial paper maturity (in days) 30 days  
Loans    
Debt Instrument [Line Items]    
Long-term line of credit $ 0 $ 0
Loans | CenterPoint Energy    
Debt Instrument [Line Items]    
Long-term line of credit 0 0
Loans | SIGECO    
Debt Instrument [Line Items]    
Long-term line of credit 0 0
Loans | Houston Electric    
Debt Instrument [Line Items]    
Long-term line of credit 0 0
Loans | CERC    
Debt Instrument [Line Items]    
Long-term line of credit 0 0
Letters of Credit    
Debt Instrument [Line Items]    
Long-term line of credit 1 1
Letters of Credit | CenterPoint Energy    
Debt Instrument [Line Items]    
Long-term line of credit 0 0
Letters of Credit | SIGECO    
Debt Instrument [Line Items]    
Long-term line of credit 0 0
Letters of Credit | Houston Electric    
Debt Instrument [Line Items]    
Long-term line of credit 0 0
Letters of Credit | CERC    
Debt Instrument [Line Items]    
Long-term line of credit 1 1
Commercial Paper    
Debt Instrument [Line Items]    
Long-term line of credit 897 1,520
Commercial Paper | CenterPoint Energy    
Debt Instrument [Line Items]    
Long-term line of credit $ 897 $ 1,036
Weighted Average Interest Rate 5.47% 5.54%
Number of days until commercial paper maturity (in days) 60 days  
Commercial Paper | SIGECO    
Debt Instrument [Line Items]    
Long-term line of credit $ 0 $ 0
Weighted Average Interest Rate 0.00% 0.00%
Commercial Paper | Houston Electric    
Debt Instrument [Line Items]    
Long-term line of credit $ 0 $ 0
Weighted Average Interest Rate 0.00% 0.00%
Commercial Paper | CERC    
Debt Instrument [Line Items]    
Long-term line of credit $ 0 $ 484
Weighted Average Interest Rate 0.00% 5.53%