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Regulatory Matters - Narrative (Details) $ in Millions |  |  |  |  | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 11, 2024 MW | Oct. 12, 2023 USD ($) | Apr. 05, 2023 USD ($) | Mar. 23, 2023 USD ($) | Dec. 31, 2021 lease | Sep. 30, 2024 USD ($) | 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 |  |  |  |  |  | 3,007 | 2,513 |  |  |  |
Cost of recovery for power consumption | MW | 32 |  |  |  |  |  |  |  |  |  |
Return on investment for power consumption | MW | 5 |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  | 41,891 | 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 |  |  |  |  |  | 242 | 161 |  |  |  |
Regulatory assets |  |  |  |  |  | 816 | 850 |  |  |  |
Property, plant and equipment |  |  |  |  |  | 15,295 | 15,672 |  |  |  |
Houston Electric |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  | 1,288 | 752 |  |  |  |
Number of leases entered into | lease |  |  |  |  | 2 |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  | 21,371 | 19,515 |  |  |  |
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 |  |  |  |  |  | 67 |  |  |  |  |
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 |  |  |  |  |  | 67 |  |  |  |  |
Regulatory assets |  |  |  |  |  | 83 |  |  |  |  |
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 |  |  |  |  |  | 83 | 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 |  |  |  |  |  | 74 |  |  |  |  |
Property, plant and equipment |  |  |  |  |  | 345 |  |  |  |  |
Estimated storm restoration costs |  |  |  |  |  | 462 |  |  |  |  |
Hurricane Beryl | Houston Electric |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  | 453 |  |  |  |  |
Property, plant and equipment |  |  |  |  |  | 670 |  |  |  |  |
Estimated storm restoration costs |  |  |  |  |  | $ 1,100 |  |  |  |  |

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