Stock-Based Compensation (Share-Based Payment Arrangement, Option, Exercise Price Range) (Details) - Employee Stock Option - $ / shares	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit	$ 35.27
Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit	$ 82.79
Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding	2,923,646	3,226,456
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	6 years 25 days
Share-Based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Exercise Price	$ 56.52	$ 53.38
Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable	1,943,447
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	$ 53.47
Range Of Exercise Prices2 [Member]
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit	40
Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit	$ 49.99
Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding	970,092
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	6 years 6 months 25 days
Share-Based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Exercise Price	$ 48.31
Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable	525,282
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	$ 47.28
Range Of Exercise Prices3 [Member]
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit	50
Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit	$ 59.99
Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding	887,717
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	6 years 6 months 10 days
Share-Based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Exercise Price	$ 54.54
Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable	711,573
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	$ 54.62
Range Of Exercise Prices1 [Member]
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit	30
Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit	$ 39.99
Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding	222,934
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	1 year 7 months 28 days
Share-Based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Exercise Price	$ 37.51
Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable	222,934
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	$ 37.51
Range Of Exercise Prices4 [Member]
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit	60
Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit	$ 69.99
Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding	483,658
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	4 years 29 days
Share-Based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Exercise Price	$ 65.86
Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable	483,658
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	$ 65.86
Range Of Exercise Prices5
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit	70
Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit	$ 79.99
Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding	0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	0 years
Share-Based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Exercise Price	$ 0
Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable	0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	$ 0
Range Of Exercise Prices6
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit	80
Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit	$ 89.99
Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding	359,245
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	9 years 7 days
Share-Based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Exercise Price	$ 82.79
Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable	0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	$ 0

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(ii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- 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

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

- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

+ Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 718
-SubTopic 10
-Subparagraph (e)(1)
-Name Accounting Standards Codification
-Paragraph 2
-Section 50
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	etr_RangeOfExercisePricesAxis=etr_RangeOfExercisePrices2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	etr_RangeOfExercisePricesAxis=etr_RangeOfExercisePrices3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	etr_RangeOfExercisePricesAxis=etr_RangeOfExercisePrices1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	etr_RangeOfExercisePricesAxis=etr_RangeOfExercisePrices4Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	etr_RangeOfExercisePricesAxis=etr_RangeOfExercisePrices5Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	etr_RangeOfExercisePricesAxis=etr_RangeOfExercisePrices6Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: