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INVESTMENTS IN UNCONSOLIDATED AFFILIATES (Tables)
 12 Months Ended
Dec. 31, 2020
Equity Method Investments and Joint Ventures [Abstract]  
Summary of Investments Eversource's investments included the following:
 Investment Balance as of December 31,
(Millions of Dollars)Ownership Interest20202019
Offshore Wind Business - North East Offshore and Bay State Wind50 %$887.1 $649.3 
Natural Gas Pipeline - Algonquin Gas Transmission, LLC15 %125.2 127.8 
Renewable Energy Investment Fund90 %71.6 72.4 
Other various23.2 22.1 
Total Investments in Unconsolidated Affiliates$1,107.1 $871.6