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Held for Sale and Divestitures (CenterPoint Energy and CERC) - Narrative (Details)
mi in Thousands, $ in Millions
 12 Months Ended
May 21, 2023
USD ($)
Apr. 29, 2021
USD ($)
mi
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Nov. 30, 2024
USD ($)
Feb. 19, 2024
USD ($)
mi
May 31, 2022
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Proceeds from divestiture of businesses     $ 0.0 $ 144.0 $ 2,075.0      
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration]     Gain (loss) on sale          
Miles of pipeline | mi   17            
Reimbursement of transition services       1.0 40.0      
Transition services receivables       0.0        
CERC                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Proceeds from divestiture of businesses     $ 0.0 $ 0.0 2,075.0      
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Louisiana And Mississippi Natural Gas LDC Businesses | CERC                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Purchase price             $ 1,200.0  
Miles of pipeline (in miles) | mi             12  
Number of customers (more than)             0.3  
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Energy Systems Group                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Equity purchase agreement, purchase price $ 157.0              
Proceeds from divestiture of businesses $ 154.0              
Working capital and other adjustment           $ 2.0    
Gain (loss) on sale     (13.0)          
Disposal group, not discontinued operations, transaction costs     3.0          
Current tax expense of divestiture     $ 32.0          
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Arkansas and Oklahoma Natural Gas Businesses                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Proceeds from divestiture of businesses   $ 2,150.0            
Gain (loss) on sale         303.0      
Disposal group, not discontinued operations, transaction costs         59.0      
Recovery of costs   $ 425.0            
Accounts receivable, net               $ 15.0
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Arkansas and Oklahoma Natural Gas Businesses | CERC                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Gain (loss) on sale         557.0      
Disposal group, not discontinued operations, transaction costs         $ 59.0      
Accounts receivable, net               $ 15.0