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Supplemental Disclosure of Cash Flow and Balance Sheet Information (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | $ 24 | $ 90 |  |
Restricted Cash and Cash Equivalents, Statement of Financial Position [Extensible Enumeration] | Prepaid expense and other current assets | Prepaid expense and other current assets |  |
Restricted cash included in Prepaid expenses and other current assets | $ 6 | $ 19 |  |
Total cash, cash equivalents and restricted cash shown in Statements of Consolidated Cash Flows | 30 | 109 | $ 91 | $ 254
Bond Companies and Securitization Bond Company |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 21 | 90 |  |
Houston Electric |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 14 | 76 |  |
Restricted cash included in Prepaid expenses and other current assets | 0 | 13 |  |
Total cash, cash equivalents and restricted cash shown in Statements of Consolidated Cash Flows | 14 | 89 | 88 | 233
Houston Electric | Bond Companies |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 14 | 76 |  |
CERC |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 2 | 1 |  |
Restricted cash included in Prepaid expenses and other current assets | 0 | 0 |  |
Total cash, cash equivalents and restricted cash shown in Statements of Consolidated Cash Flows | $ 2 | $ 1 | $ 0 | $ 15

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