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Regulatory Matters - Schedule of Allowed Equity Return Recognized (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Unrecognized equity return | $ 226 |  | $ 226 |  | $ 204
Allowed equity return recognized | 1 | $ 14 | 22 | $ 32 |
Houston Electric |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Unrecognized equity return | 76 |  | 76 |  | 75
Allowed equity return recognized | 0 | 14 | 19 | 30 |
CERC |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Unrecognized equity return | 85 |  | 85 |  | $ 69
Allowed equity return recognized | $ 1 | $ 0 | $ 2 | $ 1 |

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- Definition Amount Of Allowed Equity Return Not Recognized In Period + References No definition available. + Details
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- Definition Amount of allowed equity return on the true-up balance that was recognized in the period + References No definition available. + Details
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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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