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Divestitures (CenterPoint Energy and CERC) - Divestitures Narrative (Details)
mi in Thousands, $ in Millions
3 Months Ended 6 Months Ended
Apr. 29, 2021
USD ($)
mi
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
May 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Discontinued Operation, Additional Disclosures [Abstract]              
Proceeds from divestitures       $ 2,075 $ 0    
Miles of pipeline (in miles) | mi 17            
Gain on sale   $ 0 $ 0 303 0    
Transition services agreement charges   10   19      
Transition services agreement, accounts receivable   7   7      
CERC              
Discontinued Operation, Additional Disclosures [Abstract]              
Proceeds from divestitures       2,075 0    
Gain on sale   $ 0 $ 0 557 $ 0    
Arkansas and Oklahoma Natural Gas Businesses | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations              
Discontinued Operation, Additional Disclosures [Abstract]              
Proceeds from divestitures $ 2,150            
Recovery of costs $ 425            
Gain on sale       303      
Transaction costs       59      
Receivables, net           $ 15 $ 46
Arkansas and Oklahoma Natural Gas Businesses | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | CERC              
Discontinued Operation, Additional Disclosures [Abstract]              
Gain on sale       557      
Transaction costs       $ 59      
Receivables, net           $ 15 $ 46