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Stock-Based Incentive Compensation Plans and Employee Benefit Plans - Change in Control Agreements and Other Employee Matters (Details) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jul. 21, 2021 USD ($) | Dec. 31, 2023 severance
Concentration Risk [Line Items] |  |
Maximum number of times annual salary included in severance benefits | severance |  | 3
Board of Directors Chairman |  |
Concentration Risk [Line Items] |  |
Lump sum cash payment for separation | $ | $ 28 |
Workforce Subject to Collective Bargaining Arrangements | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) |  | 40.00%
Workforce Subject to Collective Bargaining Arrangements Expiring in May 2026 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) |  | 17.00%
Workforce Subject to Collective Bargaining Arrangements Expiring in December 2025 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) |  | 2.00%
Workforce Subject to Collective Bargaining Arrangements Expiring in April 2025 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) |  | 5.00%
Workforce Subject to Collective Bargaining Arrangements Expiring December 2026 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) |  | 3.00%
Workforce Subject to Collective Bargaining Arrangements Expiring in December 2025 (2) | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) |  | 3.00%
Workforce Subject to Collective Bargaining Arrangements Expiring in June 2027 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) |  | 5.00%
Workforce Subject to Collective Bargaining Arrangements Expiring in June 2027 (2) | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) |  | 0.00%
Workforce Subject to Collective Bargaining Arrangements Expiring in June 2025 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) |  | 3.00%
Workforce Subject to Collective Bargaining Arrangements Expiring in September 2024 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) |  | 0.00%
Workforce Subject to Collective Bargaining Arrangements, Expiring in October 2024 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) |  | 2.00%
Houston Electric | Workforce Subject to Collective Bargaining Arrangements | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) |  | 53.00%
Houston Electric | Workforce Subject to Collective Bargaining Arrangements Expiring in May 2026 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) |  | 53.00%
Houston Electric | Workforce Subject to Collective Bargaining Arrangements Expiring in December 2025 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) |  | 0.00%
Houston Electric | Workforce Subject to Collective Bargaining Arrangements Expiring in April 2025 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) |  | 0.00%
Houston Electric | Workforce Subject to Collective Bargaining Arrangements Expiring December 2026 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) |  | 0.00%
Houston Electric | Workforce Subject to Collective Bargaining Arrangements Expiring in December 2025 (2) | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) |  | 0.00%
Houston Electric | Workforce Subject to Collective Bargaining Arrangements Expiring in June 2027 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) |  | 0.00%
Houston Electric | Workforce Subject to Collective Bargaining Arrangements Expiring in June 2027 (2) | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) |  | 0.00%
Houston Electric | Workforce Subject to Collective Bargaining Arrangements Expiring in June 2025 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) |  | 0.00%
Houston Electric | Workforce Subject to Collective Bargaining Arrangements Expiring in September 2024 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) |  | 0.00%
Houston Electric | Workforce Subject to Collective Bargaining Arrangements, Expiring in October 2024 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) |  | 0.00%
CERC Corp | Workforce Subject to Collective Bargaining Arrangements | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) |  | 48.00%
CERC Corp | Workforce Subject to Collective Bargaining Arrangements Expiring in May 2026 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) |  | 0.00%
CERC Corp | Workforce Subject to Collective Bargaining Arrangements Expiring in December 2025 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) |  | 2.00%
CERC Corp | Workforce Subject to Collective Bargaining Arrangements Expiring in April 2025 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) |  | 13.00%
CERC Corp | Workforce Subject to Collective Bargaining Arrangements Expiring December 2026 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) |  | 8.00%
CERC Corp | Workforce Subject to Collective Bargaining Arrangements Expiring in December 2025 (2) | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) |  | 7.00%
CERC Corp | Workforce Subject to Collective Bargaining Arrangements Expiring in June 2027 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) |  | 13.00%
CERC Corp | Workforce Subject to Collective Bargaining Arrangements Expiring in June 2027 (2) | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) |  | 1.00%
CERC Corp | Workforce Subject to Collective Bargaining Arrangements Expiring in June 2025 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) |  | 0.00%
CERC Corp | Workforce Subject to Collective Bargaining Arrangements Expiring in September 2024 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) |  | 0.00%
CERC Corp | Workforce Subject to Collective Bargaining Arrangements, Expiring in October 2024 | Employees Subject To Collective Bargaining Agreements | Labor Force Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) |  | 4.00%

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