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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Income Tax Contingency [Line Items] |  |  |  |
Effective income tax rate (as a percent) | (2.00%) | 21.00% | 14.00% | 18.00%
Deferred tax, state, benefit | $ 74 |  |  | $ 74
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) | 18.00% | 19.00% | 19.00% | 19.00%
CERC |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Effective income tax rate (as a percent) | (222.00%) | 21.00% | 11.00% | 20.00%
Deferred tax, state, benefit | $ 73 |  |  | $ 73

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