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Held for Sale and Divestitures (CenterPoint Energy and CERC) - Asset and Liabilities Held for Sale (Details) - USD ($)
$ in Millions
Mar. 31, 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 $ 1,325 $ 0
Total current liabilities held for sale 224 0
CERC    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Total current assets held for sale 1,230 0
Total current liabilities held for sale 224 $ 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 33  
Accrued unbilled revenues 20  
Natural gas inventory 1  
Materials and supplies 13  
Property, plant and equipment, net 984  
Goodwill 217  
Regulatory assets 55  
Other 2  
Total current assets held for sale 1,325  
Accounts payable 25  
Customer deposits 14  
Regulatory liabilities 94  
Other 91  
Total current liabilities held for sale 224  
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 33  
Accrued unbilled revenues 20  
Natural gas inventory 1  
Materials and supplies 13  
Property, plant and equipment, net 984  
Goodwill 122  
Regulatory assets 55  
Other 2  
Total current assets held for sale 1,230  
Accounts payable 25  
Customer deposits 14  
Regulatory liabilities 94  
Other 91  
Total current liabilities held for sale $ 224