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Provision for Uncollectible Accounts (Tables)
3 Months Ended
Mar. 31, 2014
Notes To Consolidated Financial Statements [Abstract]  
Schedule Of Accounts Notes Loans And Financing Receivable Text Block
(Millions of Dollars) As of March 31, 2014 As of December 31, 2013
NU  $180.0 $171.3
CL&P   83.4  82.0
NSTAR Electric  43.1  41.7
PSNH  7.8  7.4
WMECO  10.6  10.0