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Supplemental Cash Flow Information (Tables)
9 Months Ended
Sep. 30, 2013
Notes To Consolidated Financial Statements [Abstract]  
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
G.  Supplemental Cash Flow Information 
Non-cash investing activities include plant additions included in Accounts Payable as follows:
          
(Millions of Dollars)As of September 30, 2013 As of September 30, 2012 
NU$122.9 $139.9 
CL&P 36.6  45.9 
NSTAR Electric 31.9  21.5 
PSNH 16.9  20.1 
WMECO 13.8  35.1