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Short-term Borrowings and Long-term Debt - Schedule of Debt Instruments Were Issued or Incurred (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Sep. 30, 2024
Jun. 28, 2024
Dec. 31, 2023
Debt Instrument [Line Items]        
Long-term debt $ 20,397     $ 17,559
Houston Electric        
Debt Instrument [Line Items]        
Aggregate Principal Amount 1,400      
Long-term debt 8,322     7,426
CERC        
Debt Instrument [Line Items]        
Aggregate Principal Amount 400      
Long-term debt 5,174     $ 4,670
General Mortgage Bonds | Houston Electric        
Debt Instrument [Line Items]        
Proceeds from issuance of long-term debt and capital securities, net 395      
First Mortgage Bonds        
Debt Instrument [Line Items]        
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees $ 159      
Junior Subordinated Notes        
Debt Instrument [Line Items]        
Interest Rate 2.50%      
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees $ 790      
Debt Instrument, redemption price, principal amount redeemed 500      
Total CenterPoint Energy        
Debt Instrument [Line Items]        
Aggregate Principal Amount 3,960      
General Mortgage Bonds 5.15% Due 2034 | General Mortgage Bonds | Houston Electric        
Debt Instrument [Line Items]        
Aggregate Principal Amount $ 400      
Interest Rate 5.15%      
Term Loan 1.00% Due 2025 | Term loan | Houston Electric        
Debt Instrument [Line Items]        
Aggregate Principal Amount $ 500      
Basis spread (as a percent) 1.00%      
General Mortgage Bonds 5.05% Due 2035 | General Mortgage Bonds | Houston Electric        
Debt Instrument [Line Items]        
Aggregate Principal Amount $ 500      
Interest Rate 5.05%      
Proceeds from issuance of long-term debt and capital securities, net $ 494      
CERC Senior Notes 5.40% Due 2034 | Senior Notes | CERC        
Debt Instrument [Line Items]        
Aggregate Principal Amount $ 400      
Interest Rate 5.40%      
Proceeds from issuance of long-term debt and capital securities, net $ 396      
CNP Senior Notes 5.40% Due 2029 | Senior Notes        
Debt Instrument [Line Items]        
Aggregate Principal Amount $ 700      
Interest Rate 5.40%      
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees $ 693      
CNP First Mortgage Bonds 5.18% Due 2034 | First Mortgage Bonds        
Debt Instrument [Line Items]        
Aggregate Principal Amount $ 100      
Interest Rate 5.18%      
CNP First Mortgage Bonds 5.28% Due 2036 | First Mortgage Bonds        
Debt Instrument [Line Items]        
Aggregate Principal Amount $ 60      
Interest Rate 5.28%      
CNP Junior Subordinated Notes 7.00% Due 2055 | Junior Subordinated Notes        
Debt Instrument [Line Items]        
Aggregate Principal Amount $ 400      
Interest Rate 7.00%      
CNP Junior Subordinated Notes 6.85% Due 2055 | Junior Subordinated Notes        
Debt Instrument [Line Items]        
Aggregate Principal Amount $ 400      
Interest Rate 6.85%      
CNP Junior Subordinated Notes 6.70% Due 2055 | Junior Subordinated Notes        
Debt Instrument [Line Items]        
Aggregate Principal Amount $ 500      
Interest Rate 6.70%      
Long-term debt $ 494      
Delayed Draw Term Loan (DDTL) | Houston Electric        
Debt Instrument [Line Items]        
Basis spread (as a percent) 1.00%      
Long-term debt   $ 200 $ 100  
Debt instrument, annual adjustment 0.10%      
Senior Notes Due 2024        
Debt Instrument [Line Items]        
Debt Instrument, redemption price, principal amount redeemed $ 350