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Supplemental Cash Flow Information (Tables)
6 Months Ended
Jun. 30, 2011
Notes To Consolidated Financial Statements [Abstract]  
Schedule Of Cash Flow Supplemental Disclosures Table Text Block
J. Supplemental Cash Flow Information    
Non-cash investing activities include capital expenditures incurred but not yet paid as follows:
         
(Millions of Dollars)As of June 30, 2011 As of December 31, 2010 
NU $ 109.4 $127.9 
CL&P  19.4  46.2 
PSNH  29.6  35.8 
WMECO  39.7  21.2