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Regulatory Matters - Narrative (Details) $ in Thousands |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |  |  |  |  |
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Oct. 22, 2025 USD ($) | Aug. 19, 2025 USD ($) | Aug. 14, 2025 USD ($) | Jul. 03, 2025 USD ($) | Jun. 30, 2025 USD ($) | Jun. 04, 2025 coal_fueled_electric_generating_unit transaction MW | May 27, 2025 leaseUnit lease kW MW | Apr. 28, 2025 | Mar. 19, 2025 USD ($) | Dec. 19, 2024 coal_fueled_electric_generating_unit MW | Sep. 11, 2024 MW | Mar. 23, 2023 USD ($) | Dec. 31, 2021 lease | Oct. 13, 2025 leaseUnit | Sep. 30, 2025 USD ($) MW | Jun. 20, 2025 USD ($) | May 02, 2025 USD ($) | Dec. 31, 2024 USD ($) | Nov. 08, 2024 USD ($) | Jun. 29, 2023 USD ($) | Jan. 04, 2023 USD ($)
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 156,000 |  |  | $ 239,000 |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,371,000 |  |  | 3,108,000 |  |  |
Cost of recovery for non customer specific, maximum | MW |  |  |  |  |  |  |  |  |  |  | 32 |  |  |  |  |  |  |  |  |  |
Return on investment for power consumption | MW |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |
Anticipated future transaction one (or more) | transaction |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory asset, authorized issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 401,500 |  |  |  |  |
IURC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory asset, authorized issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 350,000
February 2021 Winter Storm |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,000 |  |  |
CERC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 150,000 |  |  | 238,000 |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 852,000 |  |  | 903,000 |  |  |
Houston Electric |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,614,000 |  |  | 1,284,000 |  |  |
Number of leases entered into | lease |  |  |  |  |  |  | 2 |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
Expenses associated with short-term lease |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 81,000 |  |  | 89,000 |  |  |
Expenses associated with long term lease |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 139,000 |  |  | 158,000 |  |  |
Number of megawatts of mobile generation | MW |  |  |  |  |  |  | 20 |  |  |  |  |  |  |  | 505 |  |  |  |  |  |
Cost of recovery for non customer specific, maximum |  |  |  |  |  | 32 | 1,250 |  |  | 32 |  |  |  |  |  |  |  |  |  |  |
Number of fleet capacity | coal_fueled_electric_generating_unit |  |  |  |  |  | 15 |  |  |  | 15 |  |  |  |  |  |  |  |  |  |  |
Cost of recovery for non customer specific, minimum |  |  |  |  |  | 27 | 200 |  |  | 27 |  |  |  |  |  |  |  |  |  |  |
Long term lease, number of small power generating units | leaseUnit |  |  |  |  |  |  | 36 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease, term of contract (in months) |  |  |  |  |  |  | 36 months |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory asset, authorized issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 401,500 |  |  |  |  |  |
Houston Electric | Assets With Lease Payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Escrow deposit |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,000 |  |  |  |  |  |
Houston Electric | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term lease, number of small power generating units | leaseUnit |  |  |  |  |  |  |  |  |  |  |  |  |  | 36 |  |  |  |  |  |  |
Houston Electric | Energy Rental Solutions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of megawatts of mobile generation | kW |  |  |  |  |  |  | 200 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term lease, number of small power generating units | leaseUnit |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Houston Electric | Public Utility Commission Of Texas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,000 |  |  | 8,000 |  |  |
Amortization term (in years) |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |
Houston Electric | February 2021 Winter Storm |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,000 |  |  |  |  |  |
SIGECO | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory asset, issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 341,000 |
February 2021 Winter Storm Event | Customer Rate Relief Bond Financing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash proceeds received from government grants |  |  |  |  |  |  |  |  |  |  |  | $ 1,100,000 |  |  |  |  |  |  |  |  |
February 2021 Winter Storm Event | CERC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory asset, approximate total gas cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 67,000 |  |  | 67,000 |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 21,000 |  |  | $ 67,000 |  |  |
February 2021 Winter Storm Event | CERC | Customer Rate Relief Bond Financing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash proceeds received from government grants |  |  |  |  |  |  |  |  |  |  |  | $ 1,100,000 |  |  |  |  |  |  |  |  |
May 2024 Storm Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated case processing expenses and carrying costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 502,000 |  |
Entitled to recover a total |  |  |  |  |  |  |  |  | $ 396,000 |  |  |  |  |  |  |  |  |  |  |  |
Transmission-related costs |  |  |  |  |  |  |  |  | 29,000 |  |  |  |  |  |  |  |  |  |  |  |
Distribution-related costs |  |  |  |  |  |  |  |  | 17,500 |  |  |  |  |  |  |  |  |  |  |  |
Reduction in cost |  |  |  |  |  |  |  |  | $ 10,000 |  |  |  |  |  |  |  |  |  |  |  |
Hurricane Beryl |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated case processing expenses and carrying costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,300,000 |  |  |  |
Entitled to recover a total |  |  | $ 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transmission-related costs |  |  | 13,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution-related costs |  |  | 78,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intervenor disallowance positions cost |  |  |  |  | $ 298,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Staff disallowance positions cost |  |  |  | $ 4,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in distribution-related costs |  |  | 22,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in transmission-related costs |  |  | $ 440 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Storm restoration, costs for printing materials |  | $ 25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Storm restoration, costs for legal expenses |  | $ 125 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hurricane Beryl | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Removal of municipal legal fees and consulting and non-consulting fees | $ 2,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 954 -SubTopic 440 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478522/954-440-50-1 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478742/980-340-50-1 + Details
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