XML 80 R61.htm IDEA: XBRL DOCUMENT
v3.22.2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Components of Other Income, Net (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | $ 93,861 | $ 46,619 | $ 165,422 | $ 80,820
Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 54,900 | 22,100 | 109,200 | 42,200
AFUDC Equity |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 11,200 | 9,200 | 21,100 | 18,400
Equity in Earnings of Unconsolidated Affiliates (1) |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 16,600 | 4,700 | 17,100 | 8,400
Investment Income/(Loss) |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 1,300 | 1,900 | 1,100 | 1,300
Interest Income |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 9,500 | 8,400 | 16,100 | 9,900
Other |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 400 | 300 | 800 | 600
Equity In Earnings |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Unrealized gain associated with investment | 12,200 | 2,100 | 12,200 | 2,100
CL&P |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 19,800 | 9,879 | 39,363 | 14,787
CL&P | Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 16,200 | 4,300 | 32,100 | 7,000
CL&P | AFUDC Equity |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 2,800 | 1,700 | 5,600 | 3,400
CL&P | Equity in Earnings of Unconsolidated Affiliates (1) |  |  |  |
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 | (700) | 1,200 | (1,100) | 1,500
CL&P | Interest Income |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 1,500 | 2,700 | 2,800 | 2,800
CL&P | Other |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 0 | 0 | 0 | 100
NSTAR Electric |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 34,259 | 21,915 | 63,490 | 38,727
NSTAR Electric | Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 21,400 | 10,200 | 42,400 | 20,200
NSTAR Electric | AFUDC Equity |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 6,100 | 6,200 | 11,000 | 12,400
NSTAR Electric | Equity in Earnings of Unconsolidated Affiliates (1) |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 100 | 100 | 100 | 200
NSTAR Electric | Investment Income/(Loss) |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 500 | 600 | 200 | 800
NSTAR Electric | Interest Income |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 6,100 | 4,800 | 9,600 | 4,900
NSTAR Electric | Other |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 100 | 0 | 200 | 200
PSNH |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 7,782 | 4,260 | 15,292 | 8,427
PSNH | Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 6,700 | 2,700 | 13,300 | 5,400
PSNH | AFUDC Equity |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 600 | 300 | 1,000 | 900
PSNH | Equity in Earnings of Unconsolidated Affiliates (1) |  |  |  |
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 | 100 | 300 | 300 | 400
PSNH | Interest Income |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | 400 | 900 | 700 | 1,600
PSNH | Other |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |
Other income, net | $ 0 | $ 100 | $ 0 | $ 100

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 -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(12)) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(10)) -URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(f)) -URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (g) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 + 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: |