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Held for Sale, Divestitures and Mergers (CenterPoint Energy and CERC) - Held for Sale Narrative (Details)
$ in Millions
12 Months Ended
Apr. 29, 2021
USD ($)
mi
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Oct. 14, 2021
USD ($)
Feb. 16, 2021
shares
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Proceeds from divestitures (Note 4)   $ 22 $ 1,215 $ 0    
Miles of pipeline | mi 17,000          
Merger exchange ratio | shares           0.8595
CERC Corp            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Proceeds from divestitures (Note 4)   22 $ 365      
Arkansas and Oklahoma Natural Gas Businesses | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Proceeds from divestitures (Note 4) $ 2,150          
Recovery of costs $ 425          
Arkansas and Oklahoma Natural Gas Businesses | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | CERC Corp            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Cash payment commitment         $ 22  
Extinguishment of liability   $ 10