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Regulatory Matters - Schedule of Allowed Equity Return (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Unrecognized equity return | $ 296 |  | $ 296 |  | $ 251
Allowed equity return recognized | 7 | $ 12 | 9 | $ 21 |
Houston Electric |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Unrecognized equity return | 131 |  | 131 |  | 94
Allowed equity return recognized | 5 | 11 | 6 | 19 |
CERC |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Unrecognized equity return | 101 |  | 101 |  | $ 92
Allowed equity return recognized | $ 1 | $ 0 | $ 2 | $ 1 |

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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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