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Accounting Policies and Recent Accounting Pronouncements (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | $ 37 | $ 24 |  |
Restricted cash included in Prepaid expenses and other current assets | 8 | 6 |  |
Total cash, cash equivalents and restricted cash shown in Condensed Statements of Consolidated Cash Flows | $ 45 | $ 30 | $ 129 | $ 109
Restricted Cash and Cash Equivalent, Statement of Financial Position [Extensible Enumeration] | Prepaid expenses and other current assets | Prepaid expenses and other current assets |  |
VIEs |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | $ 31 | $ 21 |  |
Houston Electric |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 17 | 14 |  |
Restricted cash included in Prepaid expenses and other current assets | 2 | 0 |  |
Total cash, cash equivalents and restricted cash shown in Condensed Statements of Consolidated Cash Flows | 19 | 14 | 110 | 89
Houston Electric | VIEs |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 15 | 14 |  |
CERC |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 0 | 2 |  |
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 | $ 0 | $ 2 | $ 1 | $ 1

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