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Equity (CenterPoint Energy) - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning balance | $ (35) | $ (31) |
Net deferred gain from cash flow hedges | 4 | 1 | $ 0
Prior service cost (benefit) | 1 | 1 |
Actuarial losses (gain) | 2 | 1 |
Reclassification of deferred gain from cash flow hedges realized in net income | (1) | 0 |
Tax benefit (expense) | (4) | 1 |
Other comprehensive income (loss) | 18 | (4) | 33
Ending balance | (17) | (35) | (31)
Houston Electric |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning balance | 0 | 0 |
Net deferred gain from cash flow hedges | 0 | 0 |
Prior service cost (benefit) | 0 | 0 |
Actuarial losses (gain) | 0 | 0 |
Reclassification of deferred gain from cash flow hedges realized in net income | 0 | 0 |
Tax benefit (expense) | 0 | 0 |
Other comprehensive income (loss) | (1) | 0 | 0
Ending balance | (1) | 0 | 0
CERC |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning balance | 16 | 16 |
Net deferred gain from cash flow hedges | 0 | 0 |
Prior service cost (benefit) | 1 | (2) |
Actuarial losses (gain) | (2) | 2 |
Reclassification of deferred gain from cash flow hedges realized in net income | 0 | 0 |
Tax benefit (expense) | 0 | 0 |
Other comprehensive income (loss) | 1 | 0 | 6
Ending balance | 17 | 16 | $ 16
Remeasurement of pension and other postretirement plans |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Remeasurement of pension and other postretirement plans | 16 | (8) |
Remeasurement of pension and other postretirement plans | Houston Electric |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Remeasurement of pension and other postretirement plans | (1) | 0 |
Remeasurement of pension and other postretirement plans | CERC |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Remeasurement of pension and other postretirement plans | $ 2 | $ 0 |

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