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Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 28, 2022 | Jul. 31, 2021 | Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022 | Jul. 20, 2021
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock, outstanding (in shares) |  |  | 800,000 |  | 800,000 |
Preferred stock |  |  | $ 790 |  | $ 790 |
Preferred Stock Dividends and Other Adjustments [Abstract] |  |  |  |  |  |
Preferred stock dividend requirement |  |  | 12 | $ 13 |  |
Total income allocated to preferred shareholders |  |  | 12 | 13 |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |
Beginning Balance |  |  | (31) | (64) |  |
Prior service cost |  |  | (1) | 0 |  |
Actuarial losses |  |  | 0 | 1 |  |
Reclassification of deferred loss from cash flow hedges realized in net income |  |  | 0 | 1 |  |
Net current period other comprehensive income (loss) |  |  | (1) | 2 |  |
Ending Balance |  |  | (32) | (62) |  |
Houston Electric |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |
Beginning Balance |  |  | 0 | 0 |  |
Prior service cost |  |  | 0 | 0 |  |
Actuarial losses |  |  | 0 | 0 |  |
Reclassification of deferred loss from cash flow hedges realized in net income |  |  | 0 | 0 |  |
Net current period other comprehensive income (loss) |  |  | 0 | 0 |  |
Ending Balance |  |  | 0 | 0 |  |
CERC |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |
Beginning Balance |  |  | 16 | 10 |  |
Prior service cost |  |  | (1) | 0 |  |
Actuarial losses |  |  | 0 | 0 |  |
Reclassification of deferred loss from cash flow hedges realized in net income |  |  | 0 | 0 |  |
Net current period other comprehensive income (loss) |  |  | (1) | 0 |  |
Ending Balance |  |  | $ 15 | $ 10 |  |
Chief Executive Officer |  |  |  |  |  |
Preferred Stock Dividends and Other Adjustments [Abstract] |  |  |  |  |  |
Retention incentive agreement, shares issued |  |  |  |  |  | 1,000,000
Chief Executive Officer | Restricted Stock Units (RSUs) |  |  |  |  |  |
Preferred Stock Dividends and Other Adjustments [Abstract] |  |  |  |  |  |
Restricted stock units granted (in shares) | 400,000 | 400,000 |  |  |  |
Remaining shares available to be awarded (in shares) |  | 200,000 |  |  |  |
Common Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Common stock, dividends declared per share (in dollars per share) |  |  | $ 0 | $ 0 |  |
Common Stock dividends paid per share (in dollars per share) |  |  | 0.190 | 0.170 |  |
Series A Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock, dividends declared (in dollars per share) |  |  | 0 | 0 |  |
Preferred stock dividends paid per share (in dollars per share) |  |  | 30.625 | $ 30.625 |  |
Preferred stock, liquidation preference (in dollars per share) |  |  | $ 1,000 |  |  |
Preferred stock, outstanding (in shares) |  |  | 800,000 |  | 800,000 |
Preferred stock |  |  | $ 790 |  | $ 790 |
Preferred Stock Dividends and Other Adjustments [Abstract] |  |  |  |  |  |
Preferred stock dividend requirement |  |  | $ 12 | $ 13 |  |
Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock, outstanding (in shares) |  |  | 800,000 |  | 800,000 |
Preferred stock |  |  | $ 790 |  | $ 790 |

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