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Regulatory Matters - Narrative (Details) $ in Millions				12 Months Ended
	Mar. 19, 2025 USD ($)	Sep. 11, 2024 MW	Mar. 23, 2023 USD ($)	Dec. 31, 2021 lease	Mar. 31, 2025 USD ($) MW	Dec. 31, 2024 USD ($)	Nov. 08, 2024 USD ($)	Jun. 29, 2023 USD ($)	Jan. 04, 2023 USD ($)
Regulatory Assets [Line Items]
Total current regulatory assets					$ 168.0	$ 239.0
Regulatory assets					3,086.0	3,108.0
Cost of recovery for power consumption | MW		32
Return on investment for power consumption | MW		5
February 2021 Winter Storm
Regulatory Assets [Line Items]
Total current regulatory assets					67.0
Total regulatory asset					19.0	19.0
Public Utility Commission Of Texas
Regulatory Assets [Line Items]
Total regulatory asset					8.0	8.0
IURC
Regulatory Assets [Line Items]
Regulatory asset, authorized issuance costs									$ 350.0
CERC
Regulatory Assets [Line Items]
Total current regulatory assets					155.0	238.0
Regulatory assets					829.0	903.0
CERC | February 2021 Winter Storm
Regulatory Assets [Line Items]
Total current regulatory assets					67.0
Houston Electric
Regulatory Assets [Line Items]
Regulatory assets					1,346.0	1,284.0
Number of leases entered into | lease				2
Expenses associated with short-term lease					87.0	89.0
Expenses associated with long term lease					$ 165.0	158.0
Number of megawatts of mobile generation | MW					505
Houston Electric | Assets With Lease Payments
Regulatory Assets [Line Items]
Escrow deposit					$ 75.0
Houston Electric | February 2021 Winter Storm
Regulatory Assets [Line Items]
Total regulatory asset					19.0	19.0
Houston Electric | Public Utility Commission Of Texas
Regulatory Assets [Line Items]
Total regulatory asset					8.0	8.0
SIGECO | Subsidiaries
Regulatory Assets [Line Items]
Regulatory asset, issued								$ 341.0
February 2021 Winter Storm Event
Regulatory Assets [Line Items]
Regulatory assets					44.0
February 2021 Winter Storm Event | Customer Rate Relief Bond Financing
Regulatory Assets [Line Items]
Cash proceeds received from government grants			$ 1,100.0
February 2021 Winter Storm Event | CERC
Regulatory Assets [Line Items]
Regulatory asset, approximate total gas cost					2,000.0
Total current regulatory assets						67.0
Regulatory assets					44.0	$ 67.0
February 2021 Winter Storm Event | CERC | Customer Rate Relief Bond Financing
Regulatory Assets [Line Items]
Cash proceeds received from government grants			$ 1,100.0
May 2024 Storm Events
Regulatory Assets [Line Items]
Estimated case processing expenses and carrying costs							$ 502.0
Entitled to recover a total	$ 396.0
Transmission-related costs	29.0
Distribution-related costs	17.5
Reduction in cost	$ 10.0
Hurricane Beryl | Houston Electric
Regulatory Assets [Line Items]
Estimated storm restoration costs					$ 1,200.0

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Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost.

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