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Related Party Transactions (Houston Electric and CERC) (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
Houston Electric |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Money pool investments (borrowings), net | $ (71) |  | $ (71) |  | $ 238
Cash dividends paid to parent | 94 | $ 79 | 249 | $ 239 |
Houston Electric | Additional Paid-in-Capital |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Contribution from parent | 94 | 235 | 324 | 885 |
Houston Electric | Operation and maintenance expense |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Net affiliate service charges (billings) | (1) | (1) | (4) | (7) |
Houston Electric | Operation and maintenance expense | CenterPoint Energy |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Corporate service charges | $ 45 | 40 | $ 124 | 115 |
Houston Electric | Investments |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Weighted average interest rate | 4.98% |  | 4.98% |  | 5.59%
CERC |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Money pool investments (borrowings), net | $ 0 |  | $ 0 |  | $ 1
Cash dividends paid to parent | 24 | 36 | 270 | 347 |
CERC | Additional Paid-in-Capital |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Contribution from parent | 0 | 0 | 290 | 500 |
CERC | Operation and maintenance expense |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Net affiliate service charges (billings) | 1 | 1 | 4 | 7 |
CERC | Operation and maintenance expense | CenterPoint Energy |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Corporate service charges | $ 50 | $ 56 | $ 156 | $ 162 |
CERC | Investments |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Weighted average interest rate | 4.98% |  | 4.98% |  | 5.59%

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