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Divestitures (CenterPoint Energy and CERC) - Divestitures Narrative (Details)
mi in Thousands, $ in Millions
3 Months Ended
Apr. 29, 2021
USD ($)
mi
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Discontinued Operation, Additional Disclosures [Abstract]      
Proceeds from divestitures   $ 2,060 $ 0
Miles of pipeline | mi 17    
Gain on sale   303 0
Transition services agreement charges   9  
Transition services agreement, accounts receivable   7  
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  
CERC Corp      
Discontinued Operation, Additional Disclosures [Abstract]      
Proceeds from divestitures   2,060 0
Gain on sale   557 $ 0
CERC Corp | Arkansas and Oklahoma Natural Gas Businesses | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations      
Discontinued Operation, Additional Disclosures [Abstract]      
Gain on sale   557  
Transaction costs   $ 59