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Commitment and Contingencies (Long-Term Purchase Commitment) (Details)	3 Months Ended	6 Months Ended
	Sep. 30, 2025 unit	Jun. 30, 2025 unit	Dec. 31, 2025 MW
Minimum [Member]
Long-Term Purchase Commitment [Line Items]
Generation Capacity | MW			400
Power island equipment
Long-Term Purchase Commitment [Line Items]
Long-Term Purchase Commitment, Minimum Quantity Required	21	15
Combustion turbine
Long-Term Purchase Commitment [Line Items]
Long-Term Purchase Commitment, Minimum Quantity Required	2	2

X

- Definition

Generation Capacity

+ References

No definition available.

+ Details

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

X

- 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

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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

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

X

- Details

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

X

- Details

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

X

- Details

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