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DEFINED CONTRIBUTION PLANS (TABLES)
12 Months Ended
Dec. 31, 2015
Notes To Consolidated Financial Statements [Abstract]  
Schedule Of Defined Contribution Plans 401k [Table Text Block]
       NSTAR      
(Millions of Dollars)Eversource CL&P Electric PSNH WMECO
2015$30.4 $4.8 $6.3 $3.4 $1.0
2014 29.7  5.0  6.3  3.2  1.0
2013 37.0  5.1  8.5  3.3  1.0