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LONG-TERM DEBT - Schedule of Long-term Debt Maturities (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]  
2019 $ 801.1
2020 296.1
2021 1,033.5
2022 1,188.9
2023 1,665.2
Thereafter 7,977.7
Total 12,962.5
The Connecticut Light And Power Company  
Debt Instrument [Line Items]  
2019 250.0
2020 0.0
2021 0.0
2022 0.0
2023 400.0
Thereafter 2,615.3
Total 3,265.3
NSTAR Electric Company  
Debt Instrument [Line Items]  
2019 0.0
2020 95.0
2021 250.0
2022 400.0
2023 80.0
Thereafter 2,140.0
Total 2,965.0
Public Service Company Of New Hampshire  
Debt Instrument [Line Items]  
2019 150.0
2020 0.0
2021 282.0
2022 0.0
2023 325.0
Thereafter 50.0
Total $ 807.0