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Related Party Transactions (Houston Electric and CERC) (Tables) | 9 Months Ended
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Sep. 30, 2025
Related Party Transactions [Abstract] |
Schedule of Money Pool Investment and Borrowing | The table below summarizes CenterPoint Energy money pool activity:
| September 30, 2025 |  | December 31, 2024
| Houston Electric |  | CERC |  | Houston Electric |  | CERC
| (in millions, except interest rates)
Money pool investments (1) | $ | 509 |  |  | $ | — |  |  | $ | 368 |  |  | $ | — |
Weighted average interest rate | 4.25 | % |  | — | % |  | 4.65 | % |  | — | %
(1)Included in Accounts and notes receivable–affiliated companies in Houston Electric’s respective Condensed Consolidated Balance Sheets as of September 30, 2025 and December 31, 2024.
Schedule of Related Party Transactions | Houston Electric and CERC affiliate-related transactions were as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
| Houston Electric |  | CERC |  | Houston Electric |  | CERC |  | Houston Electric |  | CERC |  | Houston Electric |  | CERC
| (in millions)
Interest income (expense), net (1) | $ | (1) |  |  | $ | — |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | (1) |  |  | $ | 10 |  |  | $ | 9 |  |  | $ | 2 |
(1) Interest income is included in Other income, net and interest expense is included in Interest expense and other finance charges on Houston Electric’s and CERC’s respective Statements of Consolidated Income. The table below presents amounts charged for these services, which are included primarily in Operation and maintenance expenses on Houston Electric’s and CERC’s respective Condensed Statements of Consolidated Income:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
| Houston Electric |  | CERC |  | Houston Electric |  | CERC |  | Houston Electric |  | CERC |  | Houston Electric |  | CERC
| (in millions)
Corporate service charges | $ | 52 |  |  | $ | 58 |  |  | $ | 45 |  |  | $ | 50 |  |  | $ | 142 |  |  | $ | 164 |  |  | $ | 124 |  |  | $ | 156 |
Affiliate service charges (billings), net | (2) |  |  | 2 |  |  | (1) |  |  | 1 |  |  | (3) |  |  | 3 |  |  | (4) |  |  | 4 |

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- Definition Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 850 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483326/850-10-50-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 850 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483326/850-10-50-1 + Details
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