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Equity (CenterPoint Energy) (Tables) | 12 Months Ended
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Dec. 31, 2023
Stockholders' Equity Note [Abstract] |
Dividends Declared | CenterPoint Energy declared and paid dividends on its Common Stock during 2023, 2022 and 2021 as presented in the table below:
| Dividends Declared Per Share |  | Dividends Paid Per Share
| 2023 |  | 2022 |  | 2021 |  | 2023 |  | 2022 |  | 2021
Common Stock | $ | 0.7800 |  |  | $ | 0.7200 |  |  | $ | 0.6600 |  |  | $ | 0.7700 |  |  | $ | 0.7000 |  |  | $ | 0.6500 |
Series A Preferred Stock (1) | 30.6250 |  |  | 61.2500 |  |  | 61.2500 |  |  | 61.2500 |  |  | 61.2500 |  |  | 61.2500 |
Series B Preferred Stock (2) | — |  |  | — |  |  | 35.0000 |  |  | — |  |  | — |  |  | 52.5000 |
Series C Preferred Stock (3) | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 0.1600 |
(1)All of the outstanding shares of Series A Preferred Stock were redeemed during 2023 as further described below. (2)All of the outstanding shares of Series B Preferred Stock were converted to Common Stock during 2021. (3)The Series C Preferred Stock was entitled to participate in any dividend or distribution (excluding those payable in Common Stock) with the Common Stock on a pari passu, pro rata, as-converted basis. The per share amount reflects the dividend per share of Common Stock as if the Series C Preferred Stock were converted into Common Stock. All of the outstanding Series C Preferred Stock was converted to Common Stock during 2021. Preferred Stock (CenterPoint Energy)
| Liquidation Preference Per Share |  | Shares Outstanding as of December 31, |  | Outstanding Value as of December 31,
|  | 2023 |  | 2022 |  | 2021 |  | 2023 |  | 2022 |  | 2021
| (in millions, except shares and per share amount)
Series A Preferred Stock (1) | $ | 1,000 |  |  | — |  |  | 800,000 |  |  | 800,000 |  |  | $ | — |  |  | $ | 790 |  |  | $ | 790 |
|  |  | — |  |  | 800,000 |  |  | 800,000 |  |  | $ | — |  |  | $ | 790 |  |  | $ | 790 |
(1)All of the outstanding shares of Series A Preferred Stock were redeemed during 2023 as further described below. Dividend Requirement on Preferred Stock
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
| (in millions)
Series A Preferred Stock | $ | 50 |  |  | $ | 49 |  |  | $ | 49 |
Series B Preferred Stock | — |  |  | — |  |  | 46 |
Total income allocated to preferred shareholders | $ | 50 |  |  | $ | 49 |  |  | $ | 95 |
Schedule of Accumulated Other Comprehensive Income (Loss) | Amounts recognized in accumulated other comprehensive loss (gain) consist of the following:
| December 31,
| 2023 |  | 2022
| Pension Benefits |  | Postretirement Benefits |  | Pension Benefits |  | Postretirement Benefits
| CenterPoint Energy |  | CenterPoint Energy |  | CERC |  | CenterPoint Energy |  | CenterPoint Energy |  | CERC
| (in millions)
Unrecognized actuarial loss (gain) | $ | 69 |  |  | $ | (34) |  |  | $ | (27) |  |  | $ | 70 |  |  | $ | (36) |  |  | $ | (28) |
Unrecognized prior service cost | — |  |  | 12 |  |  | 10 |  |  | — |  |  | 13 |  |  | 11 |
Net amount recognized in accumulated other comprehensive loss (gain) | $ | 69 |  |  | $ | (22) |  |  | $ | (17) |  |  | $ | 70 |  |  | $ | (23) |  |  | $ | (17) |
Changes in accumulated comprehensive income (loss) are as follows:
| Year Ended December 31,
| 2023 |  | 2022
| CenterPoint Energy |  |  |  | CERC |  | CenterPoint Energy |  |  |  | CERC
| (in millions)
Beginning Balance | $ | (31) |  |  |  |  | $ | 16 |  |  | $ | (64) |  |  |  |  | $ | 10 |
Other comprehensive income (loss) before reclassifications: |  |  |  |  |  |  |  |  |  |  |
Remeasurement of pension and other postretirement plans | (8) |  |  |  |  | — |  |  | (40) |  |  |  |  | 10 |
Amounts reclassified from accumulated other comprehensive loss: |  |  |  |  |  |  |  |  |  |  |
Net deferred gain from cash flow hedges | 1 |  |  |  |  | — |  |  | — |  |  |  |  | — |
Prior service cost (1) | 1 |  |  |  |  | (2) |  |  | (1) |  |  |  |  | (1) |
Actuarial losses (1) | 1 |  |  |  |  | 2 |  |  | 8 |  |  |  |  | 1 |
Settlement (2) | — |  |  |  |  | — |  |  | 67 |  |  |  |  | — |
Reclassification of deferred loss from cash flow hedges realized in net income | — |  |  |  |  | — |  |  | 1 |  |  |  |  | — |
Tax benefit (expense) | 1 |  |  |  |  | — |  |  | (2) |  |  |  |  | (4) |
Net current period other comprehensive income (loss) | (4) |  |  |  |  | — |  |  | 33 |  |  |  |  | 6 |
Ending Balance | $ | (35) |  |  |  |  | $ | 16 |  |  | $ | (31) |  |  |  |  | $ | 16 |
(1)Amounts are included in the computation of net periodic cost and are reflected in Other, net in each of the Registrants’ respective Statements of Consolidated Income. (2)Amounts presented represent a one-time, non-cash settlement cost (benefit), prior to regulatory deferrals, which are required when the total lump sum distributions or other settlements of plan benefit obligations during a plan year exceed the service cost and interest cost components of the net periodic cost for that year. Amounts presented in the table above are included in Other income (expense), net in CenterPoint Energy’s Statements of Consolidated Income, net of regulatory deferrals.

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