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Regulatory Matters - Narrative (Details) $ in Millions |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 03, 2025 USD ($) | Jun. 30, 2025 USD ($) MW | Jun. 04, 2025 coal_fueled_electric_generating_unit transaction MW | May 27, 2025 leaseUnit lease MW kW | 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 | 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 |  | $ 167.0 |  |  |  |  |  |  |  |  |  |  | $ 239.0 |  |  |
Regulatory assets |  | 3,088.0 |  |  |  |  |  |  |  |  |  |  | 3,108.0 |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  | $ 396.0 |  |  |  |  |
Public Utility Commission Of Texas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  | 8.0 |  |  |  |  |  |  |  |  |  |  | 8.0 |  |  |
IURC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory asset, authorized issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 350.0
February 2021 Winter Storm |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  | 67.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  | 19.0 |  |  |  |  |  |  |  |  |  |  | 19.0 |  |  |
CERC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  | 148.0 |  |  |  |  |  |  |  |  |  |  | 238.0 |  |  |
Regulatory assets |  | 781.0 |  |  |  |  |  |  |  |  |  |  | 903.0 |  |  |
CERC | February 2021 Winter Storm |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  | 67.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Houston Electric |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  | 1,396.0 |  |  |  |  |  |  |  |  |  |  | 1,284.0 |  |  |
Number of leases entered into | lease |  |  |  | 2 |  |  |  |  |  | 2 |  |  |  |  |  |
Expenses associated with short-term lease |  | 84.0 |  |  |  |  |  |  |  |  |  |  | 89.0 |  |  |
Expenses associated with long term lease |  | $ 156.0 |  |  |  |  |  |  |  |  |  |  | 158.0 |  |  |
Number of megawatts of mobile generation | MW |  | 505 |  | 20 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |
Houston Electric | Energy Rental Solutions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of megawatts of mobile generation | MW |  |  |  | 200 |  |  |  |  |  |  |  |  |  |  |  |
Long term lease, number of small power generating units | leaseUnit |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |
Houston Electric | Assets With Lease Payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Escrow deposit |  | $ 71.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Houston Electric | Public Utility Commission Of Texas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  | 8.0 |  |  |  |  |  |  |  |  |  |  | 8.0 |  |  |
Amortization term (in years) |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Houston Electric | February 2021 Winter Storm |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  | 19.0 |  |  |  |  |  |  |  |  |  |  | 19.0 |  |  |
SIGECO | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory asset, issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 341.0 |
February 2021 Winter Storm Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  | 30.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  |  | 67.0 |  |  |
Regulatory assets |  | 30.0 |  |  |  |  |  |  |  |  |  |  | $ 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated case processing expenses and carrying costs |  |  |  |  |  |  |  |  |  |  |  | $ 1,300.0 |  |  |  |
Intervenor disallowance positions cost |  | $ 298.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hurricane Beryl | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Staff disallowance positions cost | $ 4.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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