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Regulatory Matters - Schedule of Allowed Equity Return (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Unrecognized equity return | $ 313 |  | $ 313 |  | $ 251
Allowed equity return recognized | 9 | $ 1 | 18 | $ 22 |
Houston Electric |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Unrecognized equity return | 144 |  | 144 |  | 94
Allowed equity return recognized | 8 | 0 | 14 | 19 |
CERC |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Unrecognized equity return | 105 |  | 105 |  | $ 92
Allowed equity return recognized | $ 1 | $ 1 | $ 3 | $ 2 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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