Administrative Expenses (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
EBP 005
Administrative Expenses [Line Items]
Increase (decrease) in revenue credit allocation	$ 2.0	$ 2.5

EBP, Change In Net Asset Available For Benefit, Increase (Decrease) From Other Investment Income (Loss), Revenue Credit

No definition available.

Name:	es_EBPChangeInNetAssetAvailableForBenefitIncreaseDecreaseFromOtherInvestmentIncomeLossRevenueCredit
Namespace Prefix:	es_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration