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Supplemental Disclosure of Cash Flow and Balance Sheet Information - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Houston Electric | Other Current Liabilities
Condensed Financial Statements, Captions [Line Items]
Contributions in aid of construction	$ 85	$ 47
Credits Related to Customers on Budget Billing Programs | CERC
Condensed Financial Statements, Captions [Line Items]
Contract with customer, liability, current, budget billing programs	$ 98	$ 118

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- Definition

Contract with Customer, Liability, Current, Budget Billing Programs

+ References

No definition available.

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- References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3

Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Topic 810
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481231/810-10-45-11

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- Definition

Developers, builders, governmental agencies and municipalities will provide the entity with cash, or in some cases property, to extend its services to their properties. Nonrefundable contributions are recorded as contributions in aid of construction ("CIAC").

+ References

No definition available.

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