XML 82 R62.htm IDEA: XBRL DOCUMENT
v3.24.2.u1

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Components of Other Income, Net (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | $ 115,285 | $ 94,875 | $ 206,315 | $ 183,857
Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 30,000 | 33,300 | 57,800 | 68,100
AFUDC Equity |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 23,700 | 19,000 | 50,500 | 34,500
Equity in Earnings of Unconsolidated Affiliates |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 23,200 | 5,000 | 31,000 | 8,800
Investment Income/(Loss) |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 1,100 | (1,400) | 300 | (3,100)
Interest Income |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 37,100 | 21,400 | 67,100 | 44,500
Other |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 200 | 17,600 | (400) | 31,100
Equity in Earnings |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Unrealized gain associated with investment | 23,400 |  |  |
CL&P |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 22,977 | 13,362 | 39,445 | 28,299
CL&P | Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 7,200 | 8,400 | 13,700 | 17,900
CL&P | AFUDC Equity |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 5,500 | 4,600 | 11,500 | 8,700
CL&P | Equity in Earnings of Unconsolidated Affiliates |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 0 | 0 | 0 | 0
CL&P | Investment Income/(Loss) |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | (100) | (1,100) | (900) | (1,700)
CL&P | Interest Income |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 10,400 | 1,500 | 15,100 | 3,400
CL&P | Other |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 0 | 0 | 0 | 0
NSTAR Electric |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 48,421 | 40,909 | 95,536 | 80,782
NSTAR Electric | Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 13,300 | 14,100 | 25,600 | 28,800
NSTAR Electric | AFUDC Equity |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 15,200 | 12,000 | 31,400 | 21,500
NSTAR Electric | Equity in Earnings of Unconsolidated Affiliates |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 200 | 100 | 400 | 200
NSTAR Electric | Investment Income/(Loss) |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 500 | 300 | 900 | (200)
NSTAR Electric | Interest Income |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 19,200 | 14,400 | 37,200 | 30,400
NSTAR Electric | Other |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 0 | 0 | 0 | 100
PSNH |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 7,772 | 6,301 | 14,822 | 12,019
PSNH | Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 3,700 | 3,900 | 7,300 | 8,100
PSNH | AFUDC Equity |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 1,700 | 1,100 | 3,600 | 1,800
PSNH | Equity in Earnings of Unconsolidated Affiliates |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 0 | 0 | 0 | 0
PSNH | Investment Income/(Loss) |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 0 | (300) | (200) | (400)
PSNH | Interest Income |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 2,400 | 1,200 | 4,100 | 2,100
PSNH | Other |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | $ 0 | $ 400 | $ 0 | $ 400

X
- Definition [Line Items] for Summary of Accounting Policies [Table] + References No definition available. + Details
Name: | es_SummaryofAccountingPoliciesLineItems
Namespace Prefix: | es_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of income (loss) for proportionate share of equity method investee's income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 270 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482964/270-10-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (ee) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(10)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481664/323-10-45-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(12)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(f)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 + Details
Name: | us-gaap_IncomeLossFromEquityMethodInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 + Details
Name: | us-gaap_NonoperatingIncomeExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=es_NonServiceCostBenefitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=es_AFUDCEquityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=es_EquityinEarningsLossOfUnconsolidatedAffiliateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=es_InvestmentIncomeLossMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_InterestIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=es_OtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=es_EquityInEarningsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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: |