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LEASES - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Lessee, Lease, Description [Line Items] |  |  |
Right-of-use assets in exchange for the assumption of new operating lease liabilities | $ 18.9 | $ 2.1 | $ 0.6
Right-of-use assets in exchange for the assumption of new finance lease liabilities | $ 3.5 | 2.3 | 0.7
CMA |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Right-of-use assets in exchange for the assumption of new operating lease liabilities |  |  | 14.7
Right-of-use assets in exchange for the assumption of new finance lease liabilities |  |  | 54.2
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] |  |  |
Right-of-use assets in exchange for the assumption of new operating lease liabilities | $ 2.4 | 0.0 | 0.1
Right-of-use assets in exchange for the assumption of new finance lease liabilities | $ 0.0 | 0.0 | 0.0
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] |  |  |
Right-of-use assets in exchange for the assumption of new operating lease liabilities | $ 0.0 | 1.9 | 0.2
Right-of-use assets in exchange for the assumption of new finance lease liabilities | $ 0.0 | 0.0 | 0.3
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 |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Right-of-use assets in exchange for the assumption of new operating lease liabilities | $ 0.0 | 0.0 | 0.0
Right-of-use assets in exchange for the assumption of new finance lease liabilities | $ 0.0 | $ 0.0 | $ 0.0
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 Amount of increase in right-of-use asset obtained in exchange for finance lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI https://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(2) -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918686-209980 + Details
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