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Regulatory Matters - Narrative (Details) $ in Millions				12 Months Ended
	Oct. 12, 2023 USD ($)	Apr. 05, 2023 USD ($)	Mar. 23, 2023 USD ($)	Dec. 31, 2021 lease	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)	Jun. 29, 2023 USD ($)	Jan. 04, 2023 USD ($)	Dec. 31, 2022	Jul. 01, 2022 USD ($)
Regulatory Assets [Line Items]
Regulatory assets					$ 243	$ 161
Regulatory assets					2,525	2,513
Property, plant and equipment					40,589	40,396
Public Utility Commission of Texas
Regulatory Assets [Line Items]
Regulatory assets					8	8
IURC
Regulatory Assets [Line Items]
Regulatory asset, issued								$ 350
CERC
Regulatory Assets [Line Items]
Regulatory assets					240	161
Regulatory assets					768	850
Property, plant and equipment					14,998	15,672
Houston Electric
Regulatory Assets [Line Items]
Regulatory assets					845	752
Property, plant and equipment					20,448	19,515
Number of leases entered into | lease				2
Houston Electric | Public Utility Commission of Texas
Regulatory Assets [Line Items]
Regulatory assets					8	8
Houston Electric | Public Utility Commission Of Texas | TEEEF Lease One
Regulatory Assets [Line Items]
Recovery of deferred costs sought										$ 200
Regulatory asset, revenue requirement amount		$ 39
Regulatory asset, amortization period		82 months 15 days
Houston Electric | Public Utility Commission Of Texas | TEEEF Lease Two
Regulatory Assets [Line Items]
Regulatory asset, amortization period		78 months							102 months
Regulatory asset, annual revenue requirement amount		$ 188
Regulatory asset, lease, incremental revenue requirement increase		$ 149
Regulatory asset, revenue requirement amount reduction	$ 35
SIGECO | Subsidiaries
Regulatory Assets [Line Items]
Regulatory asset, issued							$ 341
February 2021 Winter Storm
Regulatory Assets [Line Items]
Regulatory assets					66
February 2021 Winter Storm | Operation and maintenance expense
Regulatory Assets [Line Items]
Regulatory assets					18	17
February 2021 Winter Storm | CERC
Regulatory Assets [Line Items]
Regulatory assets					66
Regulatory assets					92
February 2021 Winter Storm | Houston Electric | Operation and maintenance expense
Regulatory Assets [Line Items]
Regulatory assets					18	17
February 2021 Winter Storm Event
Regulatory Assets [Line Items]
Regulatory asset, approximate total gas cost					2,000
Regulatory assets						86
Regulatory assets					92	130
February 2021 Winter Storm Event | CERC
Regulatory Assets [Line Items]
Regulatory assets						86
Regulatory assets						$ 130
February 2021 Winter Storm Event | Customer Rate Relief Bond Financing
Regulatory Assets [Line Items]
Cash proceeds received from government grants			$ 1,100
February 2021 Winter Storm Event | Customer Rate Relief Bond Financing | CERC
Regulatory Assets [Line Items]
Cash proceeds received from government grants			$ 1,100
May 2024 Storm Events | Houston Electric
Regulatory Assets [Line Items]
Regulatory assets					70
Property, plant and equipment					308
Estimated cost included in accounts payable					291
May 2024 Storm Events | Houston Electric | Minimum
Regulatory Assets [Line Items]
Estimated storm restoration costs					425
May 2024 Storm Events | Houston Electric | Maximum
Regulatory Assets [Line Items]
Estimated storm restoration costs					$ 475

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Amount Of Securitization Bonds Issued

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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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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