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OTHER RETIREMENT BENEFITS
12 Months Ended
Dec. 31, 2015
Notes To Consolidated Financial Statements [Abstract]  
Compensation Related Costs, General [Text Block]

D.       Other Retirement Benefits

Eversource provides retirement and other benefits for certain current and past company officers. These benefits are accounted for on an accrual basis and expensed over a period equal to the service lives of the employees. The actuarially-determined liability for these benefits, which is included in Other Long-Term Liabilities on the balance sheets, as well as the related expense included in Operations and Maintenance on the income statements, are as follows:

            
EversourceAs of and For the Years Ended December 31,
(Millions of Dollars)2015 2014 2013
Actuarially-Determined Liability$55.2 $57.5 $51.3
Other Retirement Benefits Expense 3.9  4.5  4.4

  As of and For the Years Ended December 31,
  2015 2014 2013
(Millions of Dollars)CL&P NSTAR Electric PSNH WMECO CL&P NSTAR Electric PSNH WMECO CL&P PSNH WMECO
Actuarially-Determined Liability$0.4 $ - $2.4 $0.2 $0.4 $ - $2.6 $0.2 $0.4 $2.3 $0.1
Other Retirement Benefits Expense 1.5  1.0  0.7  0.3  2.1  0.3  0.9  0.4  2.5  1.0  0.5