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Supplemental Disclosure of Cash Flow and Balance Sheet Information (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Condensed Financial Statements, Captions [Line Items]        
Interest, net of capitalized interest $ 620 $ 521    
Income tax payments (refunds), net (8) 200    
Accounts payable related to capital expenditures 1,133 264    
ROU assets obtained in exchange for lease liabilities 5 3    
Cash and cash equivalents $ 112   $ 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 $ 17   $ 19  
Total cash, cash equivalents and restricted cash shown in Condensed Statements of Consolidated Cash Flows 129 138 109 $ 91
Bond Companies and Securitization Bond Company        
Condensed Financial Statements, Captions [Line Items]        
Cash and cash equivalents 111   90  
Houston Electric        
Condensed Financial Statements, Captions [Line Items]        
Interest, net of capitalized interest 218 211    
Income tax payments (refunds), net 26 12    
Accounts payable related to capital expenditures 1,075 137    
ROU assets obtained in exchange for lease liabilities 0 1    
Cash and cash equivalents 97   76  
Restricted cash included in Prepaid expenses and other current assets 13   13  
Total cash, cash equivalents and restricted cash shown in Condensed Statements of Consolidated Cash Flows 110 126 89 88
Houston Electric | Other Current Liabilities        
Condensed Financial Statements, Captions [Line Items]        
Contributions in aid of construction 85   47  
Houston Electric | Bond Companies and Securitization Bond Company        
Condensed Financial Statements, Captions [Line Items]        
Cash and cash equivalents 96   76  
CERC        
Condensed Financial Statements, Captions [Line Items]        
Interest, net of capitalized interest 169 153    
Income tax payments (refunds), net 3 113    
Accounts payable related to capital expenditures 97 122    
ROU assets obtained in exchange for lease liabilities 0 0    
Cash and cash equivalents 1   1  
Restricted cash included in Prepaid expenses and other current assets 0   0  
Total cash, cash equivalents and restricted cash shown in Condensed Statements of Consolidated Cash Flows 1 $ 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 $ 99   $ 118