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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Income Tax Contingency [Line Items] |  |  |  |
Effective income tax rate (as a percent) | 19.00% | 27.00% | 25.00% | 26.00%
Net uncertain tax liability | $ 29 |  | $ 29 |
Houston Electric |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Effective income tax rate (as a percent) | 22.00% | 21.00% | 22.00% | 21.00%
CERC |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Effective income tax rate (as a percent) | 25.00% | 170.00% | 22.00% | 25.00%

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