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Held for Sale and Divestitures (CenterPoint Energy and CERC) - Asset and Liabilities Held for Sale (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Total current assets held for sale $ 1,346 $ 0
Total current liabilities held for sale 220 0
CERC    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Total current assets held for sale 1,251 0
Total current liabilities held for sale 220 $ 0
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Louisiana and Mississippi Regulated Natural Gas LDC Businesses    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Receivables, net 9  
Accrued unbilled revenues 11  
Natural gas inventory 6  
Materials and supplies 13  
Property, plant and equipment, net 1,030  
Goodwill 217  
Regulatory assets 57  
Other 3  
Total current assets held for sale 1,346  
Short-term borrowings 3  
Accounts payable 18  
Customer deposits 14  
Regulatory liabilities 92  
Other 93  
Total current liabilities held for sale 220  
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Louisiana and Mississippi Regulated Natural Gas LDC Businesses | CERC    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Receivables, net 9  
Accrued unbilled revenues 11  
Natural gas inventory 6  
Materials and supplies 13  
Property, plant and equipment, net 1,030  
Goodwill 122  
Regulatory assets 57  
Other 3  
Total current assets held for sale 1,251  
Short-term borrowings 3  
Accounts payable 18  
Customer deposits 14  
Regulatory liabilities 92  
Other 93  
Total current liabilities held for sale $ 220