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SHORT-TERM DEBT - Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 03, 2021
Commercial Paper | Eversource |  |  |
Short-term Debt [Line Items] |  |  |
Maximum borrowing capacity | $ 2,000,000,000 |  |
Line of Credit |  |  |
Short-term Debt [Line Items] |  |  |
Amount outstanding during period | 0 | $ 0 |
Line of Credit | Eversource |  |  |
Short-term Debt [Line Items] |  |  |
Maximum borrowing capacity | $ 2,000,000,000 |  |
Debt instrument term (in years) | 5 years |  |
CL&P |  |  |
Short-term Debt [Line Items] |  |  |
Short-term borrowing limit approved by regulatory agency |  |  | $ 600,000,000
CL&P | Unsecured Debt |  |  |
Short-term Debt [Line Items] |  |  |
Period of maturity restricting provisions of debt | 10 years |  |
Total capitalization (as a percentage) | 10.00% |  |
Capacity available under preferred stock provisions | $ 1,010,000,000.00 |  |
CL&P | Line of Credit |  |  |
Short-term Debt [Line Items] |  |  |
Maximum borrowing capacity | 450,000,000 |  |
Borrowings outstanding | 0 |  |
NSTAR Electric |  |  |
Short-term Debt [Line Items] |  |  |
Short-term borrowing limit approved by regulatory agency |  |  | $ 655,000,000
NSTAR Electric | Commercial Paper |  |  |
Short-term Debt [Line Items] |  |  |
Maximum borrowing capacity | 650,000,000 |  |
NSTAR Electric | Line of Credit |  |  |
Short-term Debt [Line Items] |  |  |
Maximum borrowing capacity | $ 650,000,000 |  |
Debt instrument term (in years) | 5 years |  |
PSNH |  |  |
Short-term Debt [Line Items] |  |  |
Short-term borrowing limit approved by regulatory agency | $ 443,500,000 |  |
Notes payable to related parties | $ 173,300,000 | $ 110,600,000 |
PSNH | Short Term Debt Authorization Calculation |  |  |
Short-term Debt [Line Items] |  |  |
Interest rate | 10.00% |  |
Short-term debt borrowing calculation approved by regulatory agency | $ 60,000,000 |  |
PSNH | Line of Credit |  |  |
Short-term Debt [Line Items] |  |  |
Maximum borrowing capacity | $ 300,000,000 |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 + Details
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