Plan Description (Details) - EBP 005	12 Months Ended
Dec. 31, 2025 USD ($) yr	Dec. 31, 2024 USD ($)
EBP, Description of Plan [Line Items]
Maximum annual compensation to total compensation, percentage	50.00%
Matching percentage	100.00%
Company Contribution	6.00%
Sum of Age and Service Years as of January 1st		6 months
Employer contribution vesting service period	3 years
Forfeited nonvested account	$ 46,518	$ 27,342
Forfeited nonvested account, decrease from employer contribution	$ 1,000,000.0	1,300,000
Participant receipt deferral age \| yr	73
Involuntary cash-out limit	$ 1,000
Note receivable, interest income	3,700,000	3,100,000
Allowance for credit loss	$ 0	$ 0
EBP, Employer Contribution, Tranche One
EBP, Description of Plan [Line Items]
Matching percentage		100.00%
Company Contribution		3.00%
EBP, Employer Contribution, Tranche Two
EBP, Description of Plan [Line Items]
Matching percentage		50.00%
Company Contribution		8.00%
EBP, Employer Contribution, Tranche Three
EBP, Description of Plan [Line Items]
Matching percentage		100.00%
Company Contribution		3.00%

EBP, Employer Contribution Vesting Service Period

No definition available.

Name:	es_EBPEmployerContributionVestingServicePeriod
Namespace Prefix:	es_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Involuntary Cash-out Limit

+ References

No definition available.

+ Details

Name:	es_EBPInvoluntaryCashOutLimit
Namespace Prefix:	es_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

EBP, Note Receivable from Participant, Account, Interest Income, Amount

+ References

No definition available.

+ Details

Name:	es_EBPNoteReceivableFromParticipantAccountInterestIncomeAmount
Namespace Prefix:	es_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

EBP, Participant Receipt Deferral Age

+ References

No definition available.

+ Details

Name:	es_EBPParticipantReceiptDeferralAge
Namespace Prefix:	es_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Requisite Service Period

+ References

No definition available.

+ Details

Name:	es_EBPRequisiteServicePeriod
Namespace Prefix:	es_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- 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/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-SubTopic 205
-Topic 962
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478416/962-205-50-1

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems
Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of employer matching contribution on eligible participant contribution to employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanEmployerContributionMatchingPercentage
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of participant compensation eligible for employer matching contribution for participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanEmployerContributionParticipantCompensationMatchedPercentage
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of plan asset, in forfeited nonvested account, no longer allocated to participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanForfeitedNonvestedAccount
Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of decrease in forfeited nonvested account of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) from employer contribution.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478873/962-325-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (j)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478416/962-205-50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-04(5)(c))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanForfeitedNonvestedAccountDecreaseForEmployerContribution
Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of allowance for credit loss on note receivable from participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAllowanceForCreditLoss
Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage of maximum pretax annual compensation that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), is permitted to contribute to total pretax annual compensation.

+ References

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanParticipantContributionPretaxMaximumAnnualCompensationToTotalCompensationPercentage
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	dei_LegalEntityAxis=es_EBP005Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	es_EBPEmployerContributionAxis=es_EBPEmployerContributionTrancheOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	es_EBPEmployerContributionAxis=es_EBPEmployerContributionTrancheTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	es_EBPEmployerContributionAxis=es_EBPEmployerContributionTrancheThreeMember
Namespace Prefix:
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