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Equity (CenterPoint Energy) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2023
Cumulative preferred stock, outstanding (in shares) | 0 | 800,000 | 800,000 |
Preferred stock, value outstanding | $ 0 | $ 790 | $ 790 |
Total income allocated to preferred shareholders | 50 | 49 | 95 |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance | (31) | (64) |  |
Prior service cost | 1 | (1) |  |
Actuarial losses | 1 | 8 |  |
Settlement | 0 | 67 |  |
Reclassification of deferred loss from cash flow hedges realized in net income | 0 | 1 |  |
Tax benefit (expense) | 1 | (2) |  |
Net current period other comprehensive income (loss) | (4) | 33 | 26 |
Ending balance | (35) | (31) | (64) |
Net deferred gain from cash flow hedges | 1 | 0 | 0 |
Other Pension, Postretirement and Supplemental Plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Remeasurement of pension and other postretirement plans | (8) | (40) |  |
CERC Corp |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance | 16 | 10 |  |
Prior service cost | (2) | (1) |  |
Actuarial losses | 2 | 1 |  |
Settlement | 0 | 0 |  |
Reclassification of deferred loss from cash flow hedges realized in net income | 0 | 0 |  |
Tax benefit (expense) | 0 | (4) |  |
Net current period other comprehensive income (loss) | 0 | 6 | 0 |
Ending balance | 16 | 16 | $ 10 |
Net deferred gain from cash flow hedges | 0 | 0 |  |
CERC Corp | Other Pension, Postretirement and Supplemental Plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Remeasurement of pension and other postretirement plans | $ 0 | $ 10 |  |
Common Stock |  |  |  |
Common stock, dividends declared per share (in dollars per share) | $ 0.7800 | $ 0.7200 | $ 0.6600 |
Common Stock dividends paid per share (in dollars per share) | 0.7700 | 0.7000 | 0.6500 |
Series A Preferred Stock |  |  |  |
Preferred stock, dividends declared (in dollars per share) | 30.6250 | 61.2500 | 61.2500 |
Preferred stock dividends paid per share (in dollars per share) | 61.2500 | $ 61.2500 | $ 61.2500 |
Preferred stock liquidation preference (in dollar per share) | $ 1,000 |  |  | $ 1,000
Cumulative preferred stock, outstanding (in shares) | 0 | 800,000 | 800,000 |
Preferred stock, value outstanding | $ 0 | $ 790 | $ 790 |
Income allocated to preferred shareholders | $ 50 | $ 49 | $ 49 |
Series B Preferred Stock |  |  |  |
Preferred stock, dividends declared (in dollars per share) | $ 0 | $ 0 | $ 35.0000 |
Preferred stock dividends paid per share (in dollars per share) | $ 0 | $ 0 | $ 52.5000 |
Income allocated to preferred shareholders | $ 0 | $ 0 | $ 46 |
Total income allocated to preferred shareholders | $ 50 | $ 49 | $ 95 |
Series C Preferred Stock |  |  |  |
Preferred stock, dividends declared (in dollars per share) | $ 0 | $ 0 | $ 0 |
Preferred stock dividends paid per share (in dollars per share) | $ 0 | $ 0 | $ 0.1600 |

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