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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Income Tax Contingency [Line Items] |  |  |  |
Effective income tax rate (as a percent) | 22.00% | 13.00% | 22.00% | 16.00%
Deferred income taxes |  |  | $ 74 | $ 200
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 | $ 11 |  | $ 11 |
Houston Electric |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Effective income tax rate (as a percent) | 20.00% | 20.00% | 20.00% | 20.00%
Deferred income taxes |  |  | $ 20 | $ 18
CERC |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Effective income tax rate (as a percent) | 11.00% | 24.00% | 22.00% | 19.00%
Deferred income taxes | $ 12 | $ 12 | $ 38 | $ 92

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