Commitments and Contingencies

No definition available.

Name:	etr_CommitmentsAndContingenciesLineItems
Namespace Prefix:	etr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Damages awarded for costs previously recorded as other operation and maintenance expenses

+ References

No definition available.

+ Details

Name:	etr_DamagesAwardedForCostsPreviouslyRecordedAsOtherOperationAndMaintenanceExpenses
Namespace Prefix:	etr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Damages awarded for costs previously recorded as plant

+ References

No definition available.

+ Details

Name:	etr_DamagesAwardedForCostsPreviouslyRecordedAsPlant
Namespace Prefix:	etr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Generation Capacity

+ References

No definition available.

+ Details

Name:	etr_GenerationCapacity
Namespace Prefix:	etr_
Data Type:	dtr-types:powerItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount awarded from other party in judgment or settlement of litigation.

+ References

No definition available.

+ Details

Name:	us-gaap_LitigationSettlementAmountAwardedFromOtherParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number of units of goods that must be purchased within the specified time period of the agreement to avoid penalties or unfavorable effects on pricing, among other adverse consequences.

+ References

No definition available.

+ Details

Name:	us-gaap_LongTermPurchaseCommitmentMinimumQuantityRequired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Cash received for the settlement of litigation during the current period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 25
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-25

+ Details

Name:	us-gaap_ProceedsFromLegalSettlements
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=etr_PowerIslandEquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=etr_CombustionTurbineMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=etr_PalisadesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Commitments and Contingencies (Narrative) (Details) $ in Millions	1 Months Ended		6 Months Ended
	Mar. 31, 2025 USD ($)	Oct. 31, 2024 USD ($)	Jun. 30, 2025 unit MW
Minimum [Member]
Commitments and Contingencies [Line Items]
Generation Capacity \| MW			400
Power island equipment
Commitments and Contingencies [Line Items]
Long-Term Purchase Commitment, Minimum Quantity Required \| unit			15
Combustion turbine
Commitments and Contingencies [Line Items]
Long-Term Purchase Commitment, Minimum Quantity Required \| unit			2
Palisades
Commitments and Contingencies [Line Items]
Litigation Settlement, Amount Awarded from Other Party		$ 7
Proceeds from Legal Settlements	$ 7
Damages awarded for costs previously recorded as other operation and maintenance expenses		3
Damages awarded for costs previously recorded as plant		$ 4