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Related Party Transactions (Houston Electric and CERC) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022
Houston Electric |  |  |
Related Party Transaction [Line Items] |  |  |
Cash dividends paid to parent | $ 51 | $ 37 |
Cash dividend paid to parent related to the sale of the Arkansas and Oklahoma Natural Gas businesses | 0 | 0 |
Contribution from parent | 650 | 637 |
Non-cash capital contribution from parent in payment for property, plant and equipment below | 0 | 38 |
Cash paid to parent for property, plant and equipment below | 0 | 52 |
Property, plant and equipment from parent | 0 | 90 |
Houston Electric | Operation and maintenance expense |  |  |
Related Party Transaction [Line Items] |  |  |
Net affiliate service charges (billings) | (3) | (6) |
Houston Electric | CenterPoint Energy | Operation and maintenance expense |  |  |
Related Party Transaction [Line Items] |  |  |
Corporate service charges | 35 | 39 |
CERC |  |  |
Related Party Transaction [Line Items] |  |  |
Cash dividends paid to parent | 204 | 38 |
Cash dividend paid to parent related to the sale of the Arkansas and Oklahoma Natural Gas businesses | 0 | 720 |
Contribution from parent | 0 | 0 |
Non-cash capital contribution from parent in payment for property, plant and equipment below | 0 | 54 |
Cash paid to parent for property, plant and equipment below | 0 | 48 |
Property, plant and equipment from parent | 0 | 102 |
CERC | Operation and maintenance expense |  |  |
Related Party Transaction [Line Items] |  |  |
Net affiliate service charges (billings) | 3 | 6 |
CERC | CenterPoint Energy | Operation and maintenance expense |  |  |
Related Party Transaction [Line Items] |  |  |
Corporate service charges | $ 50 | $ 58 |
Investments | Houston Electric |  |  |
Related Party Transaction [Line Items] |  |  |
Money pool weighted average interest rate (as a percent) | 5.27% |  | 4.75%
Investments | CERC |  |  |
Related Party Transaction [Line Items] |  |  |
Money pool weighted average interest rate (as a percent) | 5.27% |  | 4.75%
Accounts and notes receivable (payable) - affiliate companies | Houston Electric |  |  |
Related Party Transaction [Line Items] |  |  |
Money pool investments (borrowings) | $ 313 |  | $ (642)
Accounts and notes receivable (payable) - affiliate companies | CERC |  |  |
Related Party Transaction [Line Items] |  |  |
Money pool investments (borrowings) | $ 30 |  | $ 0

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