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Stock-Based Incentive Compensation Plans and Employee Benefit Plans - Change in Control Agreements and Other Employee Matters (Details)	12 Months Ended
	Dec. 31, 2024 severance
Concentration Risk [Line Items]
Maximum number of times annual salary included in severance benefits	3
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)	39.00%
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)	1.00%
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 | 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)	47.00%
CERC | 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 | 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 | 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)	12.00%
CERC | 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 | 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 | 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 | 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 | 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 | 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 | 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%

X

- Definition

Maximum number of times annual base salary included in severance benefits for certain officers in a change of control (in number of times)

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 954
-SubTopic 310
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Publisher FASB
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