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Regulatory Matters (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jan. 23, 2020
Apr. 05, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Apr. 13, 2020
Dec. 31, 2019
Amount of allowed equity return not recognized in the period         $ 154      
Amount Of Allowed Equity Return Recognized In Period     $ 8 $ 13 14 $ 24    
Rate case expense     2,149   2,149     $ 2,117
Houston Electric [Member]                
Amount of allowed equity return not recognized in the period         154      
Amount Of Allowed Equity Return Recognized In Period     8 $ 13 14 $ 24    
Rate case expense     879   879     915
CERC Corp [Member]                
Rate case expense     201   201     191
Incremental Uncollectible Receivables, Regulatory Asset     9   9      
Natural Gas Distribution [Member]                
Incremental Uncollectible Receivables, Regulatory Asset     11   11      
CenterPoint Energy Houston Electric 2019 Rate Case [Member]                
Requested revenue increase   $ 194            
Houston electric stipulation and settlement agreement [Member]                
Requested revenue increase $ 13              
Return on Equity 9.40%              
Debt Capital Structure 57.50%              
Equity Capital Structure 42.50%              
Unprotected excess deferred income tax $ 105              
Rate case expense [Member] | Houston electric stipulation and settlement agreement [Member]                
Rate case expense               $ 12
Public Utility Commission of Texas [Member]                
ERCOT Loan, COVID-19 ERP             $ 5  
ERCOT Loan, COVID-19 ERP, Outstanding     5   5      
Public Utility Commission of Texas [Member] | Houston Electric [Member]                
COVID-19 ERP Regulatory Liability     1   1      
ERCOT Loan, COVID-19 ERP             $ 5  
ERCOT Loan, COVID-19 ERP, Outstanding     $ 5   $ 5