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LEASES - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($)
Lessee, Lease, Description [Line Items] |
Lease agreements executed but not yet commenced | $ 11.5
Decrease in right of use asset | $ 7.5
Minimum |
Lessee, Lease, Description [Line Items] |
Renewal period | 1 year
Maximum |
Lessee, Lease, Description [Line Items] |
Renewal period | 20 years
CL&P |
Lessee, Lease, Description [Line Items] |
Lease agreements executed but not yet commenced | $ 7.0
CL&P | Minimum |
Lessee, Lease, Description [Line Items] |
Renewal period | 1 year
CL&P | Maximum |
Lessee, Lease, Description [Line Items] |
Renewal period | 20 years
NSTAR Electric |
Lessee, Lease, Description [Line Items] |
Lease agreements executed but not yet commenced | $ 4.5
NSTAR Electric | Minimum |
Lessee, Lease, Description [Line Items] |
Renewal period | 1 year
NSTAR Electric | Maximum |
Lessee, Lease, Description [Line Items] |
Renewal period | 20 years
PSNH | Minimum |
Lessee, Lease, Description [Line Items] |
Renewal period | 1 year
PSNH | Maximum |
Lessee, Lease, Description [Line Items] |
Renewal period | 20 years

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- Definition Lessee, Operating And Finance Lease, Renewal Term + References No definition available. + Details
Name: | es_LesseeOperatingAndFinanceLeaseRenewalTerm
Namespace Prefix: | es_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Lessee, Operating Lease, Lease Not Yet Commenced, Liability + References No definition available. + Details
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Namespace Prefix: | es_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Operating Lease, Right-Of-Use Asset, Decrease + References No definition available. + Details
Name: | es_OperatingLeaseRightOfUseAssetDecrease
Namespace Prefix: | es_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-3 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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