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LONG-TERM DEBT - Narrative (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 14, 2022
Nov. 30, 2022
Jun. 14, 2022
Dec. 31, 2021
Debt Instrument [Line Items]          
Long-term debt $ 19,723,994       $ 17,023,577
Interest included in payment to settle spent nuclear fuel obligation 8,800       8,700
CL&P          
Debt Instrument [Line Items]          
Long-term debt 4,216,488       4,215,379
PSNH          
Debt Instrument [Line Items]          
Long-term debt 1,134,914       1,163,833
Line of Credit | NSTAR Gas          
Debt Instrument [Line Items]          
Amount of long-term debt requested for issuance       $ 325,000  
Line of Credit | CL&P          
Debt Instrument [Line Items]          
Amount of long-term debt requested for issuance     $ 1,150,000    
Line of Credit | PSNH          
Debt Instrument [Line Items]          
Amount of long-term debt requested for issuance   $ 600,000      
Pre-1983 Spent Nuclear Fuel Obligation (CYAPC)          
Debt Instrument [Line Items]          
Long-term debt $ 11,900       $ 11,700