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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Income Tax Contingency [Line Items]
Effective income tax rate (as a percent)	21.00%	18.00%
Interest and penalties on uncertain tax liability	$ 32
Increase in unrecognized tax benefits is reasonably possible as a result of a lapse in statutes	$ 10
Houston Electric
Income Tax Contingency [Line Items]
Effective income tax rate (as a percent)	19.00%	20.00%
CERC
Income Tax Contingency [Line Items]
Effective income tax rate (as a percent)	25.00%	19.00%

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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Amount of increase reasonably possible in the next twelve months for the unrecognized tax benefit.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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