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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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- References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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