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Supplemental Disclosure of Cash Flow Information (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Condensed Financial Statements, Captions [Line Items]        
Interest, net of capitalized interest $ 228 $ 191    
Income tax refunds, net (12) (1)    
Accounts payable related to capital expenditures 195 270    
ROU assets obtained in exchange for lease liabilities 0 1    
Cash and cash equivalents $ 161   $ 90  
Restricted Cash and Cash Equivalents, Statement of Financial Position [Extensible Enumeration] Prepaid expenses and other current assets   Prepaid expenses and other current assets  
Restricted cash included in Prepaid expenses and other current assets (2) $ 18   $ 19  
Total cash, cash equivalents and restricted cash shown in Condensed Statements of Consolidated Cash Flows 179 130 109 $ 91
Bond Companies and Securitization Bond Company        
Condensed Financial Statements, Captions [Line Items]        
Cash and cash equivalents 132   90  
Houston Electric        
Condensed Financial Statements, Captions [Line Items]        
Interest, net of capitalized interest 59 78    
Income tax refunds, net 0 0    
Accounts payable related to capital expenditures 149 178    
ROU assets obtained in exchange for lease liabilities 0 1    
Cash and cash equivalents 109   76  
Restricted cash included in Prepaid expenses and other current assets (2) 13   13  
Total cash, cash equivalents and restricted cash shown in Condensed Statements of Consolidated Cash Flows 122 124 89 88
Houston Electric | Other Current Liabilities        
Condensed Financial Statements, Captions [Line Items]        
Contributions in aid of construction 50   47  
Houston Electric | Bond Companies        
Condensed Financial Statements, Captions [Line Items]        
Cash and cash equivalents 109   76  
CERC        
Condensed Financial Statements, Captions [Line Items]        
Interest, net of capitalized interest 76 58    
Income tax refunds, net 0 0    
Accounts payable related to capital expenditures 59 85    
ROU assets obtained in exchange for lease liabilities 0 0    
Cash and cash equivalents 17   1  
Restricted cash included in Prepaid expenses and other current assets (2) 0   0  
Total cash, cash equivalents and restricted cash shown in Condensed Statements of Consolidated Cash Flows 17 $ 1 1 $ 0
CERC | Credits Related to Customers on Budget Billing Programs        
Condensed Financial Statements, Captions [Line Items]        
Contract with customer, liability, current, budget billing programs $ 65   $ 118