XML 120 R92.htm IDEA: XBRL DOCUMENT
v3.24.0.1

PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION - Schedule of Aggregate Composite Depreciation Rates (Details) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Property, Plant and Equipment [Line Items] |  |  |
Composite depreciation rate for plant in service (in percent) | 3.10% | 3.00% | 3.10%
CL&P |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Composite depreciation rate for plant in service (in percent) | 2.80% | 2.80% | 2.80%
NSTAR Electric |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Composite depreciation rate for plant in service (in percent) | 2.70% | 2.70% | 2.80%
PSNH |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Composite depreciation rate for plant in service (in percent) | 3.00% | 3.00% | 3.10%

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

X
- Definition Composite depreciation rate for public utility plants in service. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=es_TheConnecticutLightAndPowerCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=es_NstarElectricCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=es_PublicServiceCompanyOfNewHampshirePSNHMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |