XML 110 R82.htm IDEA: XBRL DOCUMENT
v3.24.0.1

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Operating Expenses (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accounting Policies [Abstract] |  |  |
Eversource - Cost of Natural Gas | $ 792.2 | $ 1,010.2 | $ 718.6

X
- Definition Fuel power costs included in Fuel, Purchased and Net Interchange line item on the income statement + References No definition available. + Details
Name: | es_FuelPowerCosts
Namespace Prefix: | es_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration