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SHORT TERM DEBT (TABLES)
12 Months Ended
Dec. 31, 2012
Notes To Consolidated Financial Statements [Abstract]  
Schedule of Short-term Debt [Table Text Block]
  As of and for the Year Ended December 31, 2011 
(Millions of Dollars, except percentages) CL&P PSNH WMECO 
Borrowings from/(Lendings to) $58.5 $ (55.9) $(11.0) 
Weighted-Average Interest Rates  0.08% 0.1% 0.1%