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Supplemental Disclosure of Cash Flow and Balance Sheet Information - Schedule of Supplemental Disclosure of Cash Flow Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Condensed Financial Statements, Captions [Line Items]      
Interest, net of capitalized interest $ 805 $ 664 $ 480
Income tax payments (refunds), net (9) 215 421
Accounts payable related to capital expenditures 467 246 335
ROU assets obtained in exchange for lease liabilities 18 3 7
Recovery of Extraordinary Gas Costs      
Condensed Financial Statements, Captions [Line Items]      
Income taxes paid   215  
Houston Electric      
Condensed Financial Statements, Captions [Line Items]      
Interest, net of capitalized interest 321 287 223
Income tax payments (refunds), net 26 12 142
Accounts payable related to capital expenditures 381 166 168
ROU assets obtained in exchange for lease liabilities 0 1 6
CERC      
Condensed Financial Statements, Captions [Line Items]      
Interest, net of capitalized interest 190 175 104
Income tax payments (refunds), net 3 115 37
Accounts payable related to capital expenditures 103 74 139
ROU assets obtained in exchange for lease liabilities $ 13 $ 0 $ 0