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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Income Tax Contingency [Line Items] |  |  |  |
Effective income tax rate (as a percent) | 13.00% | 46.00% | 16.00% | 29.00%
Deferred remeasurement benefit |  |  | $ 25 |
Change in valuation allowance, income tax benefit |  |  | 21 |
Interest and penalties on uncertain tax liability | $ 30 |  | 30 |
Increase in unrecognized tax benefits is reasonably possible as a result of a lapse in statutes | $ 3 |  | $ 3 |
Houston Electric |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Effective income tax rate (as a percent) | 20.00% | 21.00% | 20.00% | 22.00%
CERC |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Effective income tax rate (as a percent) | 24.00% | 20.00% | 19.00% | 22.00%
Deferred remeasurement benefit |  |  | $ 24 |
Change in valuation allowance, income tax benefit |  |  | $ 21 |

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