XML 194 R166.htm IDEA: XBRL DOCUMENT
v3.25.0.1

PREFERRED STOCK NOT SUBJECT TO MANDATORY REDEMPTION - Schedule of Preferred Stock by Class (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Class of Stock [Line Items] |  |
Preferred stock value outstanding | $ 155.6 | $ 155.6
CL&P |  |
Class of Stock [Line Items] |  |
Shares outstanding (in shares) | 2,324,000 | 2,324,000
Preferred stock value outstanding | $ 116.2 | $ 116.2
CL&P | Series of 1947 Preferred Stock at $1.90 |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend rate, per-dollar-amount (in dollars per share) | $ 1,900,000 | $ 1,900,000
Redemption Price Per Share (in dollars per share) | $ 52.50 |
Shares outstanding (in shares) | 163,912 | 163,912
Preferred stock value outstanding | $ 8.2 | $ 8.2
CL&P | Series of 1947 Preferred Stock at $2.00 |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend rate, per-dollar-amount (in dollars per share) | $ 2,000,000.00 | $ 2,000,000.00
Redemption Price Per Share (in dollars per share) | $ 54.00 |
Shares outstanding (in shares) | 336,088 | 336,088
Preferred stock value outstanding | $ 16.8 | $ 16.8
CL&P | Series of 1949 Preferred Stock at $2.04 |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend rate, per-dollar-amount (in dollars per share) | $ 2,040,000.00 | $ 2,040,000.00
Redemption Price Per Share (in dollars per share) | $ 52.00 |
Shares outstanding (in shares) | 100,000 | 100,000
Preferred stock value outstanding | $ 5.0 | $ 5.0
CL&P | Series of 1949 Preferred Stock at $2.20 |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend rate, per-dollar-amount (in dollars per share) | $ 2,200,000 | $ 2,200,000
Redemption Price Per Share (in dollars per share) | $ 52.50 |
Shares outstanding (in shares) | 200,000 | 200,000
Preferred stock value outstanding | $ 10.0 | $ 10.0
CL&P | Series of 1949 Preferred Stock at 3.90% |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend rate (as a percentage) | 3.90% | 3.90%
Redemption Price Per Share (in dollars per share) | $ 50.50 |
Shares outstanding (in shares) | 160,000 | 160,000
Preferred stock value outstanding | $ 8.0 | $ 8.0
CL&P | Series E of 1954 Preferred Stock at $2.06 |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend rate, per-dollar-amount (in dollars per share) | $ 2,060,000.00 | $ 2,060,000.00
Redemption Price Per Share (in dollars per share) | $ 51.00 |
Shares outstanding (in shares) | 200,000 | 200,000
Preferred stock value outstanding | $ 10.0 | $ 10.0
CL&P | Series F of 1955 Preferred Stock at $2.09 |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend rate, per-dollar-amount (in dollars per share) | $ 2,090,000.00 | $ 2,090,000.00
Redemption Price Per Share (in dollars per share) | $ 51.00 |
Shares outstanding (in shares) | 100,000 | 100,000
Preferred stock value outstanding | $ 5.0 | $ 5.0
CL&P | Series of 1956 Preferred Stock at 4.5% |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend rate (as a percentage) | 4.50% | 4.50%
Redemption Price Per Share (in dollars per share) | $ 50.75 |
Shares outstanding (in shares) | 104,000 | 104,000
Preferred stock value outstanding | $ 5.2 | $ 5.2
CL&P | Series of 1958 Preferred Stock at 4.96% |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend rate (as a percentage) | 4.96% | 4.96%
Redemption Price Per Share (in dollars per share) | $ 50.50 |
Shares outstanding (in shares) | 100,000 | 100,000
Preferred stock value outstanding | $ 5.0 | $ 5.0
CL&P | Series of 1963 Preferred Stock at 4.5% |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend rate (as a percentage) | 4.50% | 4.50%
Redemption Price Per Share (in dollars per share) | $ 50.50 |
Shares outstanding (in shares) | 160,000 | 160,000
Preferred stock value outstanding | $ 8.0 | $ 8.0
CL&P | Series of 1967 Preferred Stock at 5.28% |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend rate (as a percentage) | 5.28% | 5.28%
Redemption Price Per Share (in dollars per share) | $ 51.43 |
Shares outstanding (in shares) | 200,000 | 200,000
Preferred stock value outstanding | $ 10.0 | $ 10.0
CL&P | Series G of 1968 Preferred Stock at $3.24 |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend rate, per-dollar-amount (in dollars per share) | $ 3,240,000 | $ 3,240,000
Redemption Price Per Share (in dollars per share) | $ 51.84 |
Shares outstanding (in shares) | 300,000 | 300,000
Preferred stock value outstanding | $ 15.0 | $ 15.0
CL&P | Series of 1968 Preferred Stock at 6.56% |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend rate (as a percentage) | 6.56% | 6.56%
Redemption Price Per Share (in dollars per share) | $ 51.44 |
Shares outstanding (in shares) | 200,000 | 200,000
Preferred stock value outstanding | $ 10.0 | $ 10.0
NSTAR Electric |  |
Class of Stock [Line Items] |  |
Shares outstanding (in shares) | 430,000 | 430,000
Preferred stock value outstanding | $ 43.0 | $ 43.0
NSTAR Electric | Preferred Stock 4.25% |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend rate (as a percentage) | 4.25% | 4.25%
Redemption Price Per Share (in dollars per share) | $ 103.625 |
Shares outstanding (in shares) | 180,000 | 180,000
Preferred stock value outstanding | $ 18.0 | $ 18.0
NSTAR Electric | Preferred Stock 4.78% |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend rate (as a percentage) | 4.78% | 4.78%
Redemption Price Per Share (in dollars per share) | $ 102.80 |
Shares outstanding (in shares) | 250,000 | 250,000
Preferred stock value outstanding | $ 25.0 | $ 25.0
Fair Value Adjustment | NSTAR Electric |  |
Class of Stock [Line Items] |  |
Preferred stock value outstanding | $ 3.6 | $ 3.6

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 Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-13 Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Topic 272 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483014/272-10-45-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 272 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482987/272-10-50-1 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-13 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-13 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-13 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-13 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 14 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-14 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-18 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(27)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-2 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 15: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-03(i)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479886/946-10-S99-3 Reference 16: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-03(i)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479886/946-10-S99-3 Reference 17: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-03(i)(2)(i)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479886/946-10-S99-3 Reference 18: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-03(i)(2)(ii)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479886/946-10-S99-3 + Details
Name: | us-gaap_ClassOfStockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount per share used to calculated dividend payments on preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-13 + Details
Name: | us-gaap_PreferredStockDividendRatePerDollarAmount
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage rate used to calculate dividend payments on preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-12A(Column A)(Footnote 3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12(Column A)(Footnote 4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column A)(Footnote 3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-3 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14(Column A)(Footnote 3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-6 + Details
Name: | us-gaap_PreferredStockDividendRatePercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-3 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-5 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-11 + Details
Name: | us-gaap_PreferredStockRedemptionPricePerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.6-05(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479170/946-210-S99-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-09(4)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479134/946-220-S99-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(16)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479170/946-210-S99-1 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-09(7)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479134/946-220-S99-3 + Details
Name: | us-gaap_PreferredStockSharesOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Value of nonredeemable preferred shares and preferred shares redeemable solely at option of issuer, held by shareholders. Excludes preferred shares repurchased and held as treasury shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(16)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479170/946-210-S99-1 + Details
Name: | us-gaap_PreferredStockValueOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=es_Seriesof1947PreferredStockat1.90Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=es_Seriesof1947PreferredStockat2.00Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=es_Seriesof1949PreferredStockat2.04Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=es_Seriesof1949PreferredStockat2.20Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=es_Seriesof1949PreferredStockat3.90Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=es_SeriesE1954PreferredStockat2.06Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=es_SeriesFof1955PreferredStockat2.09Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=es_Seriesof1956PreferredStockat4.5Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=es_Seriesof1958PreferredStockat4.96Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=es_Seriesof1963PreferredStockat4.5Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=es_Seriesof1967PreferredStockat5.28Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=es_SeriesGof1968PreferredStockat3.24Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=es_Seriesof1968PreferredStockat6.56Member
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: | us-gaap_StatementClassOfStockAxis=es_SeriesofPreferredStockat4.25Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=es_SeriesofPreferredStockat4.78Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementBasisAxis=us-gaap_CarryingReportedAmountFairValueDisclosureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |