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LONG-TERM DEBT - Schedule of Long-term Debt Maturities (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Debt Instrument [Line Items]  
2024 $ 1,950.0
2025 1,400.2
2026 1,390.2
2027 2,539.2
2028 1,978.5
Thereafter 15,005.7
Total 24,263.8
CL&P  
Debt Instrument [Line Items]  
2024 139.8
2025 400.0
2026 0.0
2027 500.0
2028 0.0
Thereafter 3,580.0
Total 4,619.8
NSTAR Electric  
Debt Instrument [Line Items]  
2024 0.0
2025 250.0
2026 300.0
2027 700.0
2028 150.0
Thereafter 3,140.0
Total 4,540.0
PSNH  
Debt Instrument [Line Items]  
2024 0.0
2025 0.0
2026 0.0
2027 0.0
2028 0.0
Thereafter 1,450.0
Total $ 1,450.0