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Related Party Transactions (Houston Electric and CERC) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Houston Electric |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Money pool investments (borrowings) | $ 287 |  | $ 287 |  | $ 238
Cash dividends paid to parent | 119 | $ 109 | 155 | $ 160 |
Houston Electric | Additional Paid-in-Capital |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Contribution from parent | 0 | 0 | 230 | 650 |
Houston Electric | Operation and maintenance expense |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Net affiliate service charges (billings) | (2) | (3) | (3) | (6) |
Houston Electric | Operation and maintenance expense | CenterPoint Energy |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Corporate service charges | $ 44 | 40 | $ 79 | 75 |
Houston Electric | Investments |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Weighted average interest rate | 5.54% |  | 5.54% |  | 5.59%
CERC |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Money pool investments (borrowings) | $ 72 |  | $ 72 |  | $ 1
Cash dividends paid to parent | 131 | 107 | 246 | 311 |
CERC | Additional Paid-in-Capital |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Contribution from parent | 290 | 500 | 290 | 500 |
CERC | Operation and maintenance expense |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Net affiliate service charges (billings) | 2 | 3 | 3 | 6 |
CERC | Operation and maintenance expense | CenterPoint Energy |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Corporate service charges | $ 55 | $ 56 | $ 106 | $ 106 |
CERC | Investments |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Weighted average interest rate | 5.54% |  | 5.54% |  | 5.59%

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