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Other Retirement Benefits (Tables)
12 Months Ended
Dec. 31, 2014
Notes To Consolidated Financial Statements [Abstract]  
Schedule of Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits by Title of Individual and Type of Deferred Compensation [Table Text Block]
            
NU  For the Years Ended December 31,
(Millions of Dollars)2014 2013 2012
Actuarially-Determined Liability$57.5 $51.3 $54.6
Other Retirement Benefits Expense 4.5  4.4  4.7

   For the Years Ended December 31,
   2014 2013 2012
(Millions of Dollars)CL&P NSTAR Electric PSNH WMECO CL&P PSNH WMECO CL&P PSNH WMECO
Actuarially-Determined Liability$0.4 $ - $2.6 $0.2 $0.4 $2.3 $0.1 $0.4 $2.5 $0.2
Other Retirement Benefits Expense 2.1  0.3  0.9  0.4  2.5  1.0  0.5  2.6  1.0  0.5