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ACQUISITION OF ASSETS OF COLUMBIA GAS OF MASSACHUSETTS (Tables)
 12 Months Ended
Dec. 31, 2022
Business Combination and Asset Acquisition [Abstract]  
Summary of Unaudited Pro Forma Financial Information Pro forma net income excludes the impact of assets and liabilities not assumed by Eversource and non-recurring costs associated with the transaction.
(Pro forma amounts in millions, except share amounts)For the Year Ended
December 31, 2020
Operating Revenues$9,273 
Net Income Attributable to Common Shareholders1,265 
Basic EPS3.73 
Diluted EPS3.72