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Regulatory Matters - Schedule of Allowed Equity Return Recognized (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Allowed equity return not recognized | $ 205 |  | $ 205 |  | $ 188
Allowed equity return recognized | 14 | $ 14 | 32 | $ 36 |
Houston Electric |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Allowed equity return not recognized | 81 |  | 81 |  | 82
Allowed equity return recognized | 14 | 12 | 30 | 33 |
CERC |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Allowed equity return not recognized | 66 |  | 66 |  | $ 54
Allowed equity return recognized | $ 0 | $ 1 | $ 1 | $ 2 |

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- Definition Amount Of Allowed Equity Return Not Recognized In Period + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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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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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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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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Namespace Prefix: |
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Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |