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LONG-TERM DEBT - Schedule of Long-term Debt Maturities (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]  
2020 $ 296.1
2021 1,033.6
2022 1,188.9
2023 1,665.2
2024 1,049.8
Thereafter 8,447.8
Total 13,681.4
CL&P  
Debt Instrument [Line Items]  
2020 0.0
2021 0.0
2022 0.0
2023 400.0
2024 139.8
Thereafter 2,975.5
Total 3,515.3
NSTAR Electric  
Debt Instrument [Line Items]  
2020 95.0
2021 250.0
2022 400.0
2023 80.0
2024 0.0
Thereafter 2,540.0
Total 3,365.0
PSNH  
Debt Instrument [Line Items]  
2020 0.0
2021 282.0
2022 0.0
2023 325.0
2024 0.0
Thereafter 350.0
Total $ 957.0