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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 ($)	Dec. 31, 2021 lease	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Jun. 29, 2023 USD ($)	Jan. 04, 2023 USD ($)	Jul. 01, 2022 USD ($)
Regulatory Assets [Line Items]
Regulatory assets current					$ 294	$ 161
Regulatory assets noncurrent					2,428	2,513
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 current					291	161
Regulatory assets noncurrent					790	850
Houston Electric
Regulatory Assets [Line Items]
Regulatory assets noncurrent					725	752
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	102 months	78 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 current					69
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 current					69
Regulatory assets noncurrent					104
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 current						86
Regulatory assets noncurrent					$ 104	130
February 2021 Winter Storm Event | CERC
Regulatory Assets [Line Items]
Regulatory assets current						86
Regulatory assets noncurrent						$ 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

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Amount Of Securitization Bonds Issued

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Regulatory Asset, Asset Recovery Of Deferred Costs From Assessment

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Amortization period for the recovery of regulatory asset, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
-SubTopic 340
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
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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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